2010 - cern · 2010. 9. 1. · 2010 international linac conference september 12 – 17, 2010...

25th International Linear Accelerator Conference i

2010 International Linac

Conference

September 12 – 17, 2010 International Congress Center

Tsukuba Epochal Tsukuba, Ibaraki, Japan

http://linac10.j-parc.jp/

Tsukuba, Japan, 12-17 September 2010 ii

Contents Welcome ………………………………..………… iii

Conference Organization……………………… vi Venue & Conference Hotels…………..……… xi Emergency Information………………..……… xii Internet & Other Services………………..……xiv Registration……………………………..…………xvi Social Program & Site Tour…….…….……… xvii Companion Program..…………….…………… xxi Industrial Exhibition………………..…..……xxii Sponsors......................................……………xxiii Proceedings Office............................……… xxv Scientific Program………………………………xxvi Program Schedule ........……………….…………1 Abstracts ........................……………….…………7

25th International Linear Accelerator Conference iii

Welcome!

On behalf of the LINAC10 International

Organizing Committee, Program Committee,

and Local Organizing Committee, I would like

to welcome each of you to the XXV

International Linac Conference in Tsukuba.

This conference series aims to provide a

comprehensive overview of recent

developments of science, technology, and

application in the field of linear accelerators.

It is planned as a forum for novel ideas and

research and development results, regarding

the linacs. Papers from the whole field of

linear accelerators are presented, including

electron, proton, heavy-ion and rare-isotope

machines, and medical and industrial linacs.

In order to familiarize participants with the

whole field and to establish interdisciplinary

contacts it is a unique tradition of this

conference series that all the sessions are

plenary. Also, all the participants enjoy the

lunches in the same place together during the

conference to help participants to continue

discussions and to make more friends. For

these purposes participants are traditionally

invitation only in this conference series.

The last linac conference held here sixteen

years ago was the first one after its

internationalization. During this sixteen-year

interval many things have happened. In

particular, the Spallation Neutron Source

(SNS) superconducting proton linac was built

Tsukuba, Japan, 12-17 September 2010 iv

and now in operation as well as the J-PARC

linac. The CERN Linac4 project started, while

the new European Spallation Source (ESS)

project is about to start. RI factories and XFEL

linacs are under construction and/or in

operation. Superconducting option was

chosen for Internationalized Linear Collider,

and the technology is getting ready thanks to

recent world-wide effort of development.

Plasma acceleration is getting more and more

realistic for practical use. There are too many

to mention. In this way, the linac community

world-wide is active, prospering, and healthy,

promising the future prospects. As a result,

the number of student posters, which will

compete for the student poster prize,

amounts to more than 10 % of posters, while

the number of papers to be presented in this

conference is coming close to 400. The

student poster session is specially set for this

competition one day before the conference

for the prize selection. You may enjoy the

session during the get-together reception.

In closing, we are grateful to the two host

institutes, High Energy Accelerator Research

Organization (KEK) and Japan Atomic Energy

Agency (JAEA), and J-PARC Center for their

support. Also, we gratefully acknowledge the

help of Argonne National Laboratory (ANL)

for Program Committee to have its meetings

twice. Among all we thank all of you for

participating in LINAC10.

25th International Linear Accelerator Conference v

Sincerely,

Yoshishige Yamazaki

J-PARC, KEK & JAEA

LINAC10 Conference Chair

Tsukuba, Japan, 12-17 September 2010 vi

CONFERENCE ORGANIZATION

Key Contacts Yoshishige Yamazaki, Conference Chair Hitoshi Hayano, Conference Vice Chair

Yong Ho Chin, Program Committee Chair Masanori Ikegami, Local Organizing

Committee Chair

Emergency Phone Numbers There are two phone numbers that can be

used if someone needs to reach you in an

emergency. Conference Office:

+81-90-4963-8620 (090-4963-8620)

+81-80-3026-6449 (080-3026-6499)

+81-90-4759-5144 (090-4759-5144)

Administration Office of Tsukuba Epochal:

+81-29-861-0001 (029-861-0001)

( ): from inside Japan

International Organizing Committee Yoshishige Yamazaki (Chair) (JAEA/J-PARC,

Japan)

Hitoshi Hayano (Vice-chair) (KEK, Japan)

Jim Alessi (BNL, USA)

John Barnard (LLNL, USA)

Winfried Barth (GSI, Germany)

Michael Borland (ANL, USA)

Swapon Chattopadhyary (CI, UK)

Yanglai Cho (ANL, USA)

Michael Fazio (LANL, USA)

Roland Garoby (CERN, Switzerland)

Terence Garvey (PSI, Switzerland)

25th International Linear Accelerator Conference

vii

Stuart Henderson (ORNL/SNS, USA)

Andrew Hutton (JLab, USA)

Horst Klein (U. Frankfurt, Germany)

Andrei Kolomiets (ITEP, Russia)

Leonid Kravchuk (INR, Russia)

L. K. Len (DOE, USA)

Israel Mardor (SOREQ, Israel)

Alban Mosnier (CEA, France)

Won Namkung (Postech, Korea)

Akira Noda (Kyoto U., Japan)

Guoxi Pei (IHEP, China)

Paolo Pierini (INFN/LASA, Italy)

Milorad Popovic (Fermilab, USA)

Ron Ruth (SLAC, USA)

Paul Schmor (TRIUMF, Canada)

Stan Schriber (Boise U., USA)

Alessandoro Variola (LAL, France)

Hans Weise (DESY, Germany)

Marion White (ANL, USA)

Richard York (MSU, USA)

Program Committee Yong Ho Chin (Chair) (KEK, Japan)

Giorgio Apollinari (Fermilab, USA)

John Barnard (LLNL, USA)

Dan Berkovits (SOREQ, Israel)

Patrick Bertrand (GANIL, France)

Graeme Burt (CI/U. Lancaster, UK)

Kwok-Chi Dominic Chan (LANL, USA)

Yanglai Cho (ANL, USA)

Yong-Sub Cho (KAERI, Korea)

Stefan Choroba (DESY, Germany)

Jean Delayen (ODU, USA)

Marc Doleans (MSU/NSCL, USA)

Tsukuba, Japan, 12-17 September 2010 viii

Alberto Facco (INFN/LAL, Italy)

Alexander Feschenko (INR. Russia)

David Findlay (STFC/RAL/ISIS, UK)

Shinian Fu (IHEP, China)

John Galambos (ORNL/SNS, USA)

Roland Garoby (CERN, Switzerland)

Terence Garvey (PSI, Switzerland)

Cameron Geddes (LBNL, USA)

Lars Groening (GSI, Germany)

Walter Hartung (MSU/NSCL, USA)

Kazuo Hasegawa (JAEA, Japan)

Sang-Ho Kim (ORNL/SNS, USA)

Andrei Kolomiets (ITEP, Russia)

Geoffrey Krafft (JLab, USA)

Robert Laxdal (TRIUMF, Canada)

L. K. Len (DOE, USA)

Matthias Liepe (Cornell/CLASSE, USA)

Frank Marhauser (JLab, USA)

Oliver Napoly (CEA, France)


Yujiro Ogawa (KEK, Japan)

Peter Ostroumov (ANL, USA)

Paolo Pierini (INFN/LASA, Italy)

Milorad Popovic (Fermilab, USA)

Deepak Raparia (BNL, USA)

Tor Raubenheimer (SLAC, USA)

Amit Roy (IUAC, India)

Alwin Schempp (U. Frankfurt, Germany)

Daniel Shulte (CERN, Switzerland)

Tsumoru Shintake (RIKEN, Japan)

Nikolay Solyak (Fermilab, USA)

Sami Tantawi (SLAC, USA)

Akira Ueno (JAEA, Japan)

Alessandoro Variola (LAL, France)

25th International Linear Accelerator Conference ix

Nikolay Vinokurov (BINP, Russia)

Hans Weise (DESY, Germany)

Marion White (ANL, USA)

Yoshishige Yamazaki (JAEA/J-PARC, Japan)

Local Organizing Committee Masanori Ikegami (Chair) (KEK, Japan)

Yong Ho Chin (KEK, Japan)

Atsushi Enomoto (KEK Tour Manager) (KEK,

Japan)

Shigeki Fukuda (KEK, Japan)

Ryoichi Hajima (JAEA, Japan)

Hirofumi Hanaki (JASRI, Japan)

Kazuo Hasegawa (J-PARC Tour Manager)

(JAEA, Japan)

Toshiyuki Hattori (TIT, Japan)

Ken Hayakawa (Nihon U., Japan)

Hitoshi Hayano (KEK, Japan)

Goro Isoyama (Osaka U., Japan)

Eiji Kako (KEK, Japan)

Osamu Kamigaito (RIKEN, Japan)

Takuya Kamitani (KEK, Japan)

Hitoshi Kobayashi (KEK, Japan)

Shuji Matsumoto (KEK, Japan)

Toshihiro Matsumoto (KEK, Japan)

Shinichiro Michizono (KEK, Japan)


Yujiro Ogawa (KEK, Japan)

Hideaki Ohgaki (Kyoto U., Japan)

Nobuo Ouchi (Exhibition Manager) (JAEA,

Japan)

Norihito Ouchi (KEK, Japan)

Shuichi Okuda (Osakafu U. Japan)

Hiroyuki Sako (JAEA, Japan)

Tsukuba, Japan, 12-17 September 2010 x

Tsumoru Shintake (RIKEN, Japan)

Jun Tamura (Oral Session Manager) (JAEA,

Japan)

Akira Ueno (JAEA, Japan)

Mitsuru Uesaka (U. Tokyo, Japan)

Yoshishige Yamazaki (JAEA/J-PARC, Japan)

Kaoru Yokoya (KEK, Japan)

Kazue Yokoyama (KEK, Japan)

Youichi Yoshida (Osaka U., Japan)

Hiroshi Yoshikawa (JAEA, Japan)

25th International Linear Accelerator Conference xi

VENUE & CONFERENCE HOTELS Venue International Congress Center Tsukuba

Epochal 2-20-3, Takezono, Tsukuba, Ibaraki 305-0032,

JAPAN

Phone: +81-29-861-0001 (029-861-0001)

Fax: +81-29-861-1209 (029-861-1209)


Conference Hotels Ohkura Frontier Hotel Tsukuba 1-1364-1, Azuma Tsukuba-city, Ibaraki

305-0031, Japan

Phone: +81-29-852-1112 (029-852-1112)

Fax: +81-29-852-5623 (029-852-5623)


Ohkura Frontier Hotel Tsukuba Epochal

2-20-1 Takezono, Tsukuba-city, Ibaraki

305-0032, Japan

Phone: +81-29-860-7700 (029-860-7700)

Fax: +81-29-860-7701 (029-860-7701)


Daiwa Roynet Hotel Tsukuba

1-5-7 Azuma, Tsukuba-shi, Ibaraki-ken

Phone: +81-29-863-3755 (029-863-3755)

Fax : +81-29-863-7955 (029-863-7955)


Tsukuba, Japan, 12-17 September 2010 xii

EMERGENCY INFORMATION Emergency Phone Numbers

Police: 110

Ambulance: 119

Fire: 119

Hospitals Tsukuba City Naika (Internal) Clinic

Phone: +81-29-856-5500 (029-856-5500) ( ): from inside Japan

Address: 2-8-8 Azuma, Tsukuba, Ibaraki

Business hour: Mon-Wed, Fri 09:30-12:30,

15:00-18:30, Sat 09:30-14:00

Tsukuba Medical Center Hospital Phone: +81-29-851-3511 (029-851-3511)


Address: 1-3-1 Amakubo, Tsukuba, Ibaraki Business hour: Mon–Fri 08:30 – 11:30 http://www.tmch.or.jp/hosp/b06.html

Pharmacies Drug Terashima

Phone: +81-29-852-7678 (029-852-7678)


Address: 24-6 Higashi-Arai, Tsukuba, Ibaraki

(Across the street, west, from Ohkura Frontier

Hotel Tsukuba Epochal)

Business hour: 7 days a week 9:00 - 24:00

25th International Linear Accelerator Conference xiii

Address: 1-9-2 Takezono, Tsukuba, Ibaraki

(In the shopping center “Dayz Town” across

the street, north, from Ohkura Frontier Hotel

Tsukuba Epochal)

Business hour: 7 days a week 10:00 - 22:00

SUNDRUG Tsukuba

Phone: +81-29-863-3799 (029-863-3799)


Tsukuba, Japan, 12-17 September 2010 xiv

INTERNET & OTHER SERVICES Wireless Internet Wireless Internet is available to all delegates

in International Congress Center Tsukuba

Epochal.

SSID: LINAC10

Password: tsukuba201009

Internet Café An Internet Café is available at Room 202A.

Internet Café hours are: Sunday, September 12 15:00 - 18:00

Monday, September 13 08:30 - 18:00

Tuesday, September 14 08:30 - 18:00

Wednesday, September 15 08:30 - 12:00

Thursday, September 16 08:30 - 18:00

Friday, September 17 08:30 - 13:30

The Internet Café also includes an area where

speakers can preview/test their presentations.

Please note that all speakers must give their

presentations with the computer system set

up in the Main Convention Hall.

Use of individual laptops cannot be

accommodated.

Copy Services Copy service is available at the administration

office of Tsukuba Epochal on its first floor.

25th International Linear Accelerator Conference xv

Banking and Currency Exchange Currency exchange between JPY and USD is

available at the following two banks and a

post office. They also accept Traveler’s Check.

Joyo Bank

Phone: +81-29-851-2151 (029-851-2151)



Business hour: Mon–Fri 09:00 – 15:00

Sumitomo Mitsui Bank

Phone: +81-29-855-9621 (029-855-9621)



(In the same building with Daiwa Roynet

Hotel Tsukuba)


Post Office

Phone: +81-29-851-9613 (029-851-9613)




ATM: Mon–Fri 09:00 – 23:00,

Sat 09:00 – 21:00, Sun 09:00 – 19:00

Cashing with your credit card is available with

ATM at the post office.

Tsukuba, Japan, 12-17 September 2010 xvi

REGISTRATION

Hours and Location The registration desk will be open at the

following time and location: Sunday, September 12

15:00 to 20:00 (Multi-purpose Hall)

Monday, September 13

08:00 to 11:30(Foyer of Main Convention Hall)

12:30 to 17:00 (Room 202B)

Tuesday, September 14

08:30 to 17:00 (Room 202B) Wednesday, September 15

08:30 to 12:00 (Room 202B) Thursday, September 16

08:30 to 17:00 (Room 202B) Friday, September 17

08:30 to 13:30 (Room 202B) Your registration fee includes attendance at

all technical sessions of the conference, the

conference guidebook, and one copy of the

proceedings on CD-ROM.

Extra Tickets Individual tickets for the Welcome Reception,

Excursion, Banquet, J-PARC Tour and KEK

Tour are limited.

If there are any tickets left, they will be

available at Registration.

25th International Linear Accelerator Conference xvii

Cancellation of Registration All cancellations must be provided in writing

to [email protected]. No refunds will be provided for cancellations

after July 30, 2010.

This policy also applies to extra tickets for

excursions and social functions.

Message Board A message board is located beside the

registration desk.

Security and Insurance Participants are asked not to leave their

belongings unattended and to wear their

conference badges at all LINAC10-sponsored

events.

The conference organizers cannot accept

liability for personal injuries sustained or for

loss or damage to participants’ (or

companions’) personal property during the

conference.

Luggage Storage The hotels will provide luggage storage for

their guests.

SOCIAL PROGRAM & SITE TOUR Summary of Events Sunday Student Poster Session Welcome Reception Wednesday Excursion – Nikko or Oarai

Tsukuba, Japan, 12-17 September 2010 xviii

Thursday Banquet at Hotel Grand Shinonome Friday J-PARC Tour or KEK Tour (not included in registration fee)

Social Events Sunday, September 12 Student Poster Session [18:00] Welcome Reception [18:00] A welcome reception will be held at

Multi-purpose Hall at the International

Congress Center Tsukuba Epochal.

All registrants are invited to attend.

Wednesday, September 13 [12:00] We have an excursion on your choice

between Nikko and Oarai.

Nikko Tour Excursion to one of the most famous

historical sites in Japan, Nikko Toshogu.

Nikko Toshogu is a Shinto shrine located in

Nikko city, Tochigi Prefecture. It is dedicated

for Tokugawa Ieyasu, the founder of the

Tokugawa shogunate. It was initially built by

the second shogun (and Ieyasu's son),

Hidetada, in 1617, and enlarged during the

time of the third shogun (and Ieyasu's

grandson), Iemitsu.

Famous buildings at the Toshogu include the

richly decorated Yomeimon Gate. Its surface

is decorated with gorgeous carvings painted

in rich colors. Other buildings are also

decorated with elaborated carvings and

ornaments, which is often a traditional

25th International Linear Accelerator Conference xix

symbol in Chinese and Japanese culture.

These beautiful buildings symbolize the

prosperity of Tokugawa shogunate, which

governed this country until the Meiji

Restoration in 1868.

Nikko Toshogu and surrounding historical

buildings have been registered as a UNESCO

World Heritage Site since 1999.

Lunch and dinner included.

The bus for Nikko Tour will meet you at 12:00.

The meeting place will be announced at the

conference.

Oarai Tour Excursion to one of the most popular tourist

destinations in Ibaraki Prefecture, the Oarai

Aquarium. The aquarium is famous for its

fascinating dolphin show. It also has more

than 500 marine species to exhibit ranging

from local fish to tropical one. Especially,

exhibitions of sharks and ocean sunfish are

unique and famous.

Oarai is a seaside town beside the Pacific

Ocean. It is blessed with a rich fishery, and a

number of tourists are lured to this town for

its fresh seafood. We plan to serve some fresh

seafood for the dinner buffet at the aquarium

cafeteria. We also plan to stop at a nearby fish

market "Nakaminato Fish Market", which is a

lively fish market attracting a number of

tourists and customers everyday from all over

the Tokyo area.

Lunch and dinner included.

The bus for Oarai Tour will meet you at 12:00.

Tsukuba, Japan, 12-17 September 2010 xx

The meeting place will be announced at the

conference.

Thursday, September 16 [19:00] Banquet Hotel Grand Shinonome, Banquet Hall The banquet place is in the walking distance

from Tsukuba Epochal and conference hotels.

We plan to provide a shuttle bus service to

Hotel Grand Shinonome, and its detail will be

announced at the conference.

Friday, September 17 [13:30/14:00] J-PARC Tour

13:20 Lunch box is provided at the Foyer of

Main Convention Hall

13:30 Bus departs from Main Entrance of

Tsukuba Epochal.

15:00 Bus arrives at J-PARC

18:00 Bus depart from J-PARC

19:30 Bus arrives at Main Entrance of Tsukuba

Epochal.

KEK Tour

13:20 Lunch box is provided at the Foyer of

Main Convention Hall

14:00 Bus departs from Main Entrance of

Tsukuba Epochal.

14:30 Bus arrives at KEK

17:30 Bus departs from KEK

18:00 Bus arrives at Main Entrance of Tsukuba

Epochal.

25th International Linear Accelerator Conference xxi

COMPANION PROGRAM

We are offering three companion tours on Sep.

13 (Mon), Sep. 14 (Tue), and Sep. 16 (Thu) to

companions attending the LINAC10

conference.

As they have long experience and outstanding

reputation as excellent tour operators for

tourists from abroad, we have decided to offer

English-guided tours operated by Hato Bus

Tours and JTB Sunrise Tours for our

companions.

We have selected the following three of the

most popular tours from their variety of

choices.

Monday September 13

Dynamic Tokyo (Hato Bus Tours)

Tuesday September 14

Kamakura Walking Tour (JTB Sunrise Tours)

Thursday September 16

Edo Tokyo Full Day (Hato Bus Tours)

These tours start from Hamamatsucho Bus

Terminal in Tokyo, and the conference office

is planning to offer a guide from Tsukuba to

Hamamatsucho Bus Terminal. Attendees to

the companion tours are supposed to meet at

the ticket gate of Tsukuba Station at 7:00 am,

and guided to the Hamamatsucho Bus

Terminal by an English-speaking guide using

Tsukuba Express train and JR train.

Tsukuba, Japan, 12-17 September 2010 xxii

INDUSTRIAL EXHIBITION Hours and Location The Industrial exhibition booths are located

at Room 101+102, the foyer of Room 101+102,

and the foyer of Room 201+202.

Exhibit hours are: Monday, September 13 13:00 to 18:00 Tuesday, September 14 09:00 to 18:00 Wednesday, September 15 09:00 to 12:00 Thursday, September 15 09:00 to 18:00

List of Exhibitors Exhibitors and sponsors registered at press

time. AET, Inc.

Bruker Biospin

Chuo Electronics Co., Ltd.

FRIATEC AG / RADDevice Co., Ltd.

Hitachi, Ltd.

Instrumentation Technologies

Kyocera Corporation

L-3 Electron Devices

Mitsubishi Electric Corporation / Mitsubishi

Electric TOKKI Systems Corporation

Mitsubishi Heavy Industries, Ltd.

Muons, Inc.

National Instruments Japan Corporation

Nihon Koshuha Co., Ltd.

NTG Neue Technologien GmbH

RI Research Instruments GmbH

Scandinova Systems

25th International Linear Accelerator Conference xxiii

TACC

Thales

Toshiba Corporation

Toshiba Electron Tubes & Devices Co., Ltd.

Toyama

Tsuji Electronics Co., Ltd.

Yokogawa Electric Corporation

Varian Technologies Japan Ltd.

SPONSORS List of Sponsors Tsukuba City

Tsukuba Science Expo Memorial Foundation

Chuo Electronics Co., Ltd.

FRIATEC AG / RADDevice Co., Ltd.

Mitsubishi Heavy Industries, Ltd.

Nihon Koshuha Co., Ltd.

Toshiba Electron Tubes & Devices Co., Ltd.

Financial Support for Students and Post-doctors We would like to thank our sponsors,

Foundation for High Energy Accelerator

Science, and Hitachi, Ltd., who helped bring

the following students and post-doctors to

Tsukuba:

Markus Aicheler (CERN, Switzerland)

Frédéric Bouly (IPN, France)

Subashini De Silva (JLAB, USA)

Florian Dziuba (IAP, Germany)

Wencheng Fang (SINAP, China)

Tsukuba, Japan, 12-17 September 2010 xxiv

Sylvain Franke (TEMF/TU Darmstadt, Germany)

Matthew Fraser (CERN, Switzerland)

Joon Yeon Kim (SNU, Korea)

Martin Konrad (TU Darmstadt, Germany)

Olga Konstantinova (Tomsk State U., Russia)

Konstantin Lekomtsev (JAI, UK)

David Longuevergne (TRIUMF, Canada)

Liang Lu (RLNR, Japan)

Vaishali Naik (DAE/VECC, India)

Nathaniel Pogue (Texas A&M U., USA)

Francesco Scantamburlo (INFN/Sez. di Padva, Italy)

Felix Schlander (DESY, Germany)

Ki Shin (ORNL, USA)

Alexey Sitnikov (ITEP, Russia)

Aleksandr Smirnov (MEPhI, Russia)

Nicholas Valles (Cornell U., USA)

Silvia Verdú-Andrés (IFIC, Spain)

Zhijun Wang (IMP, China)

Pei Zhang (DESY, Germany)

Feng Zhe (TUB, China)

25th International Linear Accelerator Conference xxv

PROCEEDINGS OFFICE Hours and Location The Proceedings Office is located at Room

202A. Editorial staff will process papers before

and during the conference. The paper

submission deadline was Thursday,

September 10. Authors are requested to check

on their papers via the status board that will

be located in or near the Proceedings Office.

Authors can also check the paper status by

logging into their SPMS accounts. If the paper

has a YELLOW dot, they can accept the

changes and turn it to GREEN themselves.

Proceedings Office hours are: Sunday, September 12 15:00 - 18:00

Monday, September 13 09:00 - 18:00

Tuesday, September 14 09:00 - 18:00

Wednesday, September 15 09:00 - 11:30

Thursday, September 16 09:00 - 18:00

Friday, September 17 09:00 - 11:00

The conference proceedings will be published

on CD-ROM and on the Joint Accelerator

Conferences Website (JACoW):

http://www.JACoW.org

Tsukuba, Japan, 12-17 September 2010 xxvi

SCIENTIFIC PROGRAM Oral Sessions All oral sessions will be in the Main

Convention Hall. A preview/testing area is

available for speakers in Room 202A.

Please note that all speakers must upload

their presentations to our file server following

the instruction below. Use of individual

laptops cannot be accommodated.

The deadline for the presentation file upload

is at 15:00 on the day before your talk for

invited speakers, and at 17:00 on Sunday

September 12 for all the speakers in oral

poster sessions.

In uploading your presentation file, please

follow the instructions described in the

following web page,

http://linac10.j-parc.jp/oralPresentation.html

Student Poster Session A special poster session for students will take

place during registration on Sunday,

September 12. Student posters should be mounted in

Multi-purpose Hall at 15:00 and manned from

15:00 to 16:00 for judging and from 18:00 to

20:00 for general viewing.

In accordance with the guidelines for

publication of contributions, these posters

25th International Linear Accelerator Conference xxvii

must also be displayed during the regular

poster sessions.

Poster Sessions There will be three poster sessions during the

conference.

The posters are in Room 201A+201B and

Room 101+102 of Tsukuba Epochal.

Each session will begin with an hour long oral

session.

Monday, September 13 15:00 to 18:00 Tuesday, September 14 15:00 to 18:00 Thursday, September 16 15:00 to 18:00

Poster halls will be ready at 11:00. Posters

should be in place no later than 12:30 and

should be taken down at the end of each

session. Any posters not removed by 18:30 will be

removed by staff and discarded.

Authors are reminded that no contributions

are accepted for publication only. Any paper

that is not presented at the conference will be

excluded from the proceedings.

The Scientific Program Committee reserves

the right to refuse papers for publication that

have not been properly presented or staffed in

the poster sessions. Manuscripts of

contributions to the proceedings (or

enlargements of them) are not considered to

be posters, and papers represented in this

way will not be accepted for publication.

Tsukuba, Japan, 12-17 September 2010 xxviii

Identification of Contributions The date and type of presentation for each

contribution in the program can be easily

identified from the program code, which is

composed as follows: The first two letters indicate the day: MO,

TU, WE, TH, FR. For oral sessions, the third letter indicates the

order of the session (1, 2, or 3). For posters sessions, the third letter is a P. A two digit (oral) or three digit (poster)

sequence number.

Program Schedule 13-Sep-2010

09:00 – 09:30 Opening RemarksLocation: Main Convention Hall

09:00 Opening addressYoshishige Yamazaki (JAEA/J-PARC)

09:10 Welcome addressMasaru Hashimoto(Ibaraki Prefectural Governor)

09:20 LogisticsYong Ho Chin (KEK)

11:00 – 11:30 Break09:30 – 11:00 Invited Oral Session MO1

Location: Main Convention HallChair: Y.H. Chin (KEK)

09:30 J-PARC ProjectS. Nagamiya (KEK)

10:00 Status of the European XFEL ProjectH. Weise (DESY)

10:30 SNS Operation at 1 MW and BeyondS. Henderson (ORNL)

11:30 – 12:30 Invited Oral Session MO2Location: Main Convention HallChair: I. Mardor (Soreq NRC)

11:30 Status and Challenges of the Spiral2 Facil-ityR. Ferdinand (GANIL)

11:50 Operating Experience of the ISAC-II Up-grade LinacR.E. Laxdal (TRIUMF)

12:10 ReA3 - the Rare Isotope Reaccelerator atMSUO.K. Kester (NSCL)

12:30 – 13:40 Lunch13:40 – 15:00 Invited Oral Session MO3

Location: Main Convention HallChair: T. Garvey (PSI)

13:40 Flash Performance and the 9 mA CurrentTestsJ. Carwardine (ANL)

14:00 The S1-Global Collaborative Efforts - 8-Cavity-Cryomodule: 2FNAL 2DESY 4KEKN. Ohuchi (KEK)

14:20 CLIC Feasibility Demonstration at CTF3R.J.M.Y. Ruber (Uppsala University)

14:40 The FNAL Third Harmonic Module forFLASHH.T. Edwards (Fermilab)

15:00 – 16:00 Contributed Oral Session MO4Location: Main Convention HallChair: W.A. Barth (GSI)

16:00 – 18:00 Poster Session MOPLocation: Poster Rooms 101, 102, 201

25th International Linear Accelerator Conference 1

14-Sep-2010 Program Schedule

09:00 – 11:00 Invited Oral Session TU1Location: Main Convention HallChair: S. Choroba (DESY)

09:00 Overview of FELs under Construction In-cluding FELs at Fermi Elettra, SPRing8 andFrascati SPARCG. Penco (ELETTRA)

09:30 Overview of Proposals for Major FEL Facili-tiesH.-H. Braun (PSI)

10:00 Worldwide ERL R&D Overview IncludingJLAMP, BNL, and Cornell ERLsG. Neil (JLAB)

10:30 RIBF and Other RIB FacilitiesN. Fukunishi (RIKEN Nishina Center)

11:00 – 11:30 Break11:30 – 12:30 Invited Oral Session TU2

Location: Main Convention HallChair: S. Henderson (ORNL)

11:30 Status of J-PARC Linac Energy UpgradeH. Ao (JAEA/LINAC)

11:50 The High Intensity Proton Linac for CSNSH.F. Ouyang (IHEP Beijing)

12:10 Plans for the ESS LinacS. Peggs (ESS-S)

12:30 – 13:40 Lunch13:40 – 15:00 Invited Oral Session TU3

Location: Main Convention HallChair: A. Schempp (IAP)

13:40 RFQ for CW ApplicationsA. Pisent (INFN/LNL)

14:00 Applications of Spoke CavitiesJ.R. Delayen (ODU)

14:20 Status of the Cornell ERL Injector Cry-omoduleM. Liepe (CLASSE)

14:40 High-Performance SC Cryomodule for CWIon AcceleratorsM.P. Kelly (ANL)

15:00 – 16:00 Contributed Oral Session TU4Location: Main Convention HallChair: Y.-S. Cho (KAERI)

16:00 – 18:00 Poster Session TUPLocation: Poster Rooms 101, 102, 201

2 Tsukuba, Japan, September 12–17, 2010


09:00 – 10:40 Invited Oral Session WE1Location: Main Convention HallChair: R. Garoby (CERN)

09:00 Design of Project-X LinacN. Solyak (Fermilab)

09:30 SARAF Accelerator Commissioning Resultsand Phase II Construction StatusL. Weissman (Soreq NRC)

10:00 Status of Linac4 Construction at CERNM. Vretenar (CERN)

10:20 Overview and Future Demands of FastChoppersA.V. Aleksandrov (ORNL)

10:40 – 11:00 Break11:00 – 12:00 Invited Oral Session WE2

Location: Main Convention HallChair: S. Fu (IHEP Beijing)

11:00 Operation and Upgrades of the LCLSJ.C. Frisch (SLAC)

11:20 Upgrade of the PLS (Pohang Light Source)Linac for the PLS-IIS.J. Park (PAL)

11:40 First Simultaneous Top-up Operation ofThree Different Rings in KEK Injector LinacM. Satoh (KEK)

12:00 – 21:00 Outing


16-Sep-2010 Program Schedule

09:00 – 11:00 Invited Oral Session TH1Location: Main Convention HallChair: R.E. Laxdal (TRIUMF)

09:00 Raising the Bar on Superconducting Nio-bium Cavity Production, Processing, andPerformanceZ.A. Conway (CLASSE)

09:30 SRF and Cryomodule R+D for ERL’sJ. Knobloch (Helmholtz-Zentrum Berlin fürMaterialien und Energie GmbH, Elektronen-Speicherring BESSY II)

10:00 Development and Future Prospects of RFSources for Linac ApplicationsE. Jensen (CERN)

10:30 Power Coupler Development for High In-tensity Superconducting LinacsG. Devanz (CEA)

11:00 – 11:30 Break11:30 – 12:30 Invited Oral Session TH2

Location: Main Convention HallChair: M. Popovic (Fermilab)

11:30 SRF Linac for Indian Energy ProgramC.S. Mishra (Fermilab)

11:50 VECC/TRIUMF Injector for the e-LinacProjectV. Naik (DAE/VECC)

12:10 Student Prize Winner Talk12:30 – 13:40 Lunch13:40 – 15:00 Invited Oral Session TH3

Location: Main Convention HallChair: P.N. Ostroumov (ANL)

13:40 Beam Dynamics Studies for Multi-GeV Pro-ton and H-minus LinacsJ.-P. Carneiro (Fermilab)

14:00 Source and Injector Design for IntenseLight Ion Beams Including Space ChargeNeutralisationN. Chauvin (CEA)

14:20 Experimental Observation of Space ChargeDriven Resonances in a LinacL. Groening (GSI)

14:40 Linear Induction Accelerators at the LosAlamos National Laboratory DARHT Facil-ityS. Nath (LANL)

15:00 – 16:00 Contributed Oral Session TH4Location: Main Convention HallChair: K.C.D. Chan (LANL)

16:00 – 18:00 Poster Session THPLocation: Poster Rooms 101, 102, 201

19:00 – 21:00 Banquet4 Tsukuba, Japan, September 12–17, 2010


09:00 – 11:00 Invited Oral Session FR1Location: Main Convention HallChair: S.G. Tantawi (SLAC)

09:00 Advance In Parallel Computing Codes ForAccelerator ScienceK. Ko (SLAC)

09:30 Plasma Accelerator Development at theBELLA and FACET ProjectsM.J. Hogan (SLAC)

10:00 Commissioning of the EBIS-Based HeavyIon Preinjector at BrookhavenJ.G. Alessi (BNL)

10:20 Progress of X-Band Accelerating StructuresT. Higo (KEK)

10:40 Study of Basic Breakdown Phenomena inHigh Gradient Vacuum StructuresV.A. Dolgashev (SLAC)

11:00 – 11:30 Break11:30 – 12:50 Invited Oral Session FR2

Location: Main Convention HallChair: Y. Yamazaki (JAEA/J-PARC)

11:30 Current and Possible New Methods forAccelerator-Based Production of MedicalIsotopesJ.A. Nolen (ANL)

11:50 Linacs for Muon Collider and Neutrino Fac-toryS. Geer (Fermilab)

12:20 Linacs and Scientific/Technological Appli-cationsA. Suzuki (KEK)

12:50 – 13:20 Closing Remarks

13:30 – 20:00 Site Tour


Abstracts 13-Sep-2010

13-Sep-10 09:30–11:00 Main Convention Hall

MO1 — Invited OralChair: Y.H. Chin (KEK)

MO10109:30

J-PARC ProjectS. Nagamiya (KEK)About ten years ago (2001) a new acceleratorproject to provide high-intensity proton beamsproceeded into its construction phase. Thisproject is called the J-PARC (Japan Proton Accel-erator Research Complex), and it was completedabout a year ago in 2009. The construction wasperformed under a cooperation of two institu-tions, KEK and JAEA. The goal of the accelera-tor power is 1 MW proton beams at 3 GeV, with400 MeV Linac injector, and 0.75 MW beams at 50GeV. Three experimental facilities are presentlyavailable: 1) the Materials and Life ExperimentalFacility where pulsed neutrons and muon beamsfrom 3 GeV are produced and utilized, 2) theHadron Experimental Facility where kaon beamsare produced, with a slow extraction mode fromthe 50 GeV (currently, 30 GeV is used), and 3) theNeutrino Experimental Facility with fast extrac-tion mode from the 50 GeV ring. I would like toreview the current status of the accelerators andexperimental facilities, in particular, under theemphasis of what are actually going on in regardexperimental programs. I also would like to men-tion a future scope of the J-PARC.

MO10210:00

Status of the European XFEL ProjectH. Weise (DESY)The internationally organized European XFELfree-electron laser is under construction at theDeutsches Elektronen-Synchrotron (DESY). Theproject is the first large scale application of theTESLA technology developed over the last 15years. Superconducting accelerating cavities willbe used to accelerate the electron beam to an en-ergy of up to 17.5 GeV. Recently an energy reduc-tion by 20% to 14 GeV was discussed as a rea-sonable compromise between cost aspects andscientific potential of the facility. With realisticassumptions on lower beam emittance, the de-sign photon beam parameters will be achieved.The talk will briefly summarize the overall XFELdesign before presenting details about the sta-tus of the superconducting linac. The activitieswithin the international collaboration will be de-scribed. Final prototyping, industrialization andcommissioning new infrastructure are the actualchallenges. Contracts for long lead items areplaced.


13-Sep-2010 Abstracts

MO10310:30

SNS Operation at 1 MW and BeyondS. Henderson (ORNL)This talk will present the stutus of SNS operationat 1MW and plan beyond it.


MO2 — Invited OralChair: I. Mardor (Soreq NRC)

MO20111:30

Status and Challenges of the Spiral2 Facil-ityR. Ferdinand (GANIL)SPIRAL 2 is a new European facility for Ra-dioactive Ion Beams being constructed at theGANIL laboratory (Caen, France). It is basedon a High Intensity CW multi-ion Accelera-tor Driver (Superconducting Linac), deliveringbeams to a High Power Production system (con-verter, target, and ion source), producing andpost-accelerating Radioactive Ion Beams withintensities never reached before. The majorcomponents of the accelerator (injectors and SCLinac), have been presently ordered. The num-ber of tested components is rapidly growing.The Superconducting Linac Accelerator incor-porates many innovative developments of theQuarter-Wave resonators and their associatedcryogenic and RF systems. The first beam is ex-pected during autumn 2011. The first operationis scheduled for late 2012 with an initial experi-mental program prepared in the framework of aEuropean Project, with many other internationalcollaborating partners.

MO20211:50

Operating Experience of the ISAC-II Up-grade LinacR.E. Laxdal (TRIUMF)The ISAC-II Phase II expansion includes the ad-dition of 20 new quarter wave resonators in threecryomodules to double the energy gain of theISAC-II superconducting linac. The rf cavitiesare produced in Canada. The talk will concen-trate on the beam commissioning (scheduled forMarch 2010) and early operating experience.

MO20312:10

ReA3 - the Rare Isotope Reaccelerator atMSUO.K. Kester (NSCL), G. Bollen, C. Comp-ton, A.C. Crawford, M. Doleans, W. Har-tung, A. Lapierre, F. Marti, G. Perdikakis,J. Popielarski, L. Popielarski, M. Portillo,D. Sanderson, S. Schwarz, J. Wlodarczak,X. Wu, Q. Zhao (NSCL)Rare isotope beam (RIB) accelerator facilitiesprovide rich research opportunities in nuclear



physics. The National Superconducting Cy-clotron Laboratory (NSCL) at Michigan StateUniversity (MSU) is constructing a RIB facility,called ReA3. It will provide unique low-energyrare isotope beams by stopping fast RIBs andreaccelerating them in a compact linac. ReA3comprises gas stopper systems, an ElectronBeam Ion Trap (EBIT) charge state booster, aroom temperature radio frequency quadrupole(RFQ), a linac using superconducting quarterwave resonators (QWRs) and an achromaticbeam transport and distribution line to the newexperimental area. Beams from ReA3 will rangefrom 3 MeV/u for heavy ions to about 6 MeV/ufor light ions, as the charge state of the ions canbe adjusted by the EBIT. ReA3 will initially usebeams from NSCL’s Coupled Cyclotron Facility(CCF). Later ReA3 will provide reacceleration ca-pability for the Facility for Rare Isotope Beams(FRIB), a new national user facility funded bythe Department of Energy (DOE) that will behosted at MSU. The ReA3 concept and status ofReA3 will be presented, with emphasis on thecomissioning of the facility, which is underway.


MO3 — Invited OralChair: T. Garvey (PSI)

MO30113:40

Flash Performance and the 9 mA CurrentTestsJ. Carwardine (ANL)An important milestone has been reached inin the ’FLASH 9mA experiment’ at DESY, withsuccessful operation of FLASH with long bunchtrains and heavily beam-loaded cavities. Bunchtrains up to 600µs were run at an average cur-rent of 9mA, extending to 800µs with a some-what lower average current. The FLASH 9mAprogramme is led by DESY in collaboration withthe ILC-GDE, and has the goal of demonstratingreliable operation and of characterizing limitsof performance of the FLASH linac with 800us-long bunch trains, 9mA average current, andcavity gradients approaching quench. The pro-gramme provides important operations experi-ence and technical input to the European XFELand the International Linear Collider, and sup-ports planned routine long bunch-train opera-tion of FLASH for FEL users. This paper high-lights the 9mA programme accomplishments todate, presents performance and operations dataanalysis, and gives an outlook for future studies.



MO30214:00

The S1-Global Collaborative Efforts - 8-Cavity-Cryomodule: 2FNAL 2DESY 4KEKN. Ohuchi (KEK), M. Akemoto, S. Fukuda,H. Hayano, E. Kako, H. Katagiri, Y. Kondou,T. Matsumoto, H. Matsushita, S. Michizono,T. Miura, H. Nakai, H. Nakajima, S. Noguchi,M. Satoh, T. Shidara, T. Shishido, T. Take-naka, A. Terashima, N. Toge, K. Tsuchiya,K. Watanabe, A. Yamamoto, Y. Yamamoto,M. Yoshida (KEK) C. Adolphsen (SLAC)T.T. Arkan, S. Barbanotti, H. Carter,M.S. Champion, R.D. Kephart, J.S. Kerby,D.V. Mitchell, Y. Orlov, T.J. Peterson, M.C. Ross(Fermilab) A. Bosotti, C. Pagani, P. Pierini(INFN/LASA) D. Kostin, L. Lilje, A. Matheisen,W.-D. Moeller, H. Weise (DESY)In an attempt at demonstrating an average fieldgradient of 31.5 MV/m as per the design ac-celerating gradient for ILC, a program calledS1-Global is in progress as an international re-search collaboration among KEK, INFN, FNAL,DESY and SLAC. The design of the S1-G cry-omodule began at May 2008 by INFN and KEK.The S1-Global cryomodule was designed to con-tain eight superconducting cavities from FNAL,DESY and KEK, and to be constructed by joiningtwo half-size cryomodules, each 6 m in length.The module containing four cavities from FNALand DESY was constructed by INFN. Four KEKcavities have been assembled in the 6 m modulewhich KEK fabricated. All major componentswere transported to KEK from INFN, FNAL andDESY in December 2009. The assembly of thetwo 6-m cryomodules started from January 2010in a collaborative work of FNAL, DESY, INFN andKEK. The construction of the S1-G cryomodulewill complete in May, and the cool-down of theS1-G cryomodule is scheduled from June 2010at the KEK-STF. In this paper, the constructionand the cold tests of the S1-Global cryomodulein the worldwide research collaboration will bepresented.

MO30314:20

CLIC Feasibility Demonstration at CTF3R.J.M.Y. Ruber (Uppsala University)At CERN the feasibility of CLIC (Compact LInearCollider) a multi-TeV electron-positron collideris being studied. In this scheme the RF power toaccelerate the main beam is produced by a highcurrent drive beam. To demonstrate this schemea test facility (CLIC Test Facility 3, CTF3) hasbeen constructed at CERN. Recently, the com-plex to generate the drive beam has been suc-cessfully commissioned producing a beam with acurrent around 30A. This beam is now being used



to test the power production. The results of thetest facility provide vital input for the CLIC con-ceptual design report to be finished by the endof 2010. This talk describes CTF3 activities andtheir importance for CLIC; it comments on de-sign readiness for CLIC after a successful CTF3demonstration.

MO30414:40

The FNAL Third Harmonic Module forFLASHH.T. Edwards (Fermilab)FNAL has contributed to FLASH at DESY thethird harmonic accelerating system, which willprovide better beams for the FEL facility. TheFNAL accelerating module has been qualifiedabove specs and will be operational in FLASH inSpring.


MO4 — Contributed OralChair: W.A. Barth (GSI)

13-Sep-10 16:00–18:00 Poster Rooms 101, 102, 201

MOP — PosterMOP001 CTF3 Probe Beam LINAC Commissioning

and OperationsW. Farabolini (CEA), D. Bogard, A. Cur-toni, P. Girardot, F. Peauger, C.S. Simon(CEA) E. Chevallay, M. Divall Csatari,N. Lebas, M. Petrarca (CERN) R. Roux (LAL)R.J.M.Y. Ruber (Uppsala University)The probe beam LINAC, CALIFES, of the CLICTest Facility (CTF3) has been developed by CEASaclay, LAL Orsay and CERN to deliver trains ofshort bunches (0.75 ps) spaced by 0.666 ps at anenergy around 170 MeV with a charge of 0.6 nC tothe TBTS (Two-beam Test Stand) intended to testthe high gradient CLIC accelerating structures.Based on 3 former LIL accelerating structuresand on a newly developed RF photo-injector, thewhole accelerator is powered with a single 3 GHzklystron delivering pulses of 45 MW through aRF pulse compression cavity and a network ofwaveguides, splitters, phase-shifters and an at-tenuator. We relate here results collected duringthe various commissioning and operation peri-ods which led to nominal performances and sta-ble beam characteristics delivered to the TBTS.Progress has been made in the laser system forbeam charge and stability, in space charge com-pensation for emittance, in RF compression lawfor energy and energy spread. The installation ofa specially developed RF power phase shifter for



the first accelerating structure used in velocitybunching allows the control of the bunch length.

MOP002 A Test Structure for CLIC Utilising Dampedand Detuned Wakefield Suppression andOptimised Surface FieldsR.M. Jones (UMAN), A. D’Elia, V.F. Khan(UMAN) A. Grudiev, W. Wuensch, R. Zen-naro (CERN)We report on the suppression of long-rangewakefields in the main linacs of the CLIC collider.The wakefield is damped using a combination ofdetuning the frequencies of beam-excited higherorder modes and by light damping, through slot-coupled manifolds. This unique accelerator, inthe process of being fabricated, will be the firststructure to demonstrate wakefield damping andthe ability to sustain high accelerating gradientsfor CLIC. This serves as an alternative to thebaseline CLIC design, which at present relies en-tirely on heavy damping. Detailed simulationsare presented, on both the optimised surfacefields resulting from the monopole mode, andfrom wakefield damping of the dipole modes.Preparations for the fabrication of a structure,suitable for high power testing, are also dis-cussed. This design takes into account prac-tical mechanical engineering issues and is theresult of several optimisations since the originalCLICDDS proposal[*].

MOP003 Injector Operation with Low ChargeBunchesY.A. Kot (DESY)The three stage bunch compression system pro-posed for the European XFEL will be able toachieve overall compression of about 100. Thiswould lead to the reduction of the bunch lengthup to 2.5 10-5 m for the designed bunch charge of1nC. It is anticipated that the final compressionwould be limited here mainly by rf tolerances(jitter) which are determined by technical speci-fications of the manufacturer. For a large varietyof experiments it could be however desirable togo to shorter bunches even on cost of less radi-ation power. A good possibility to achieve thismight be to operate the injector at lower than1nC bunch charge. In this paper the possibilityof the operation of the injector with low chargebunches was investigated. On this issue simula-tions with ASTRA code have been done in orderto find suitable working points for the low chargeregimes and to figure out the dependence of thebunch parameters on the initial bunch chargeat the cathode. The results of these simulations



for the injectors at FLASH and XFEL as well asthe discussion about possible problems are pre-sented.

MOP004 An Electron Linac Injector with a HybridBuncher StructureM. Huening (DESY), M. Schmitz (DESY)C. Liebig (Uni HH)At present the Linac II at DESY consists of a6A/150kV DC electron gun, a 400 MeV primaryelectron linac, a 800 MW positron converter, anda 450 MeV secondary electron/positron linac. Toimprove the maintainability of the system and toreduce operational risks the original 150kV diodegun will be replaced by a 100kV triode. Togetherwith the gun the whole injection system will beupgraded and optimized for minimal load onthe converter target and primary linac. The coreof the new injector are a 5MeV standing wave/travelling wave hybrid structure and a magneticenergy filter. Simulations show that With 6A DCcurrent up to 3.7A can be bunched into 20o ofthe 2.998 GHz RF. This phase range is narrowenough to fit after on-crest acceleration into theenergy acceptance of the following accumulatorring PIA.

MOP005 LLNL’s Precision Compton Scattering LightSourceF.V. Hartemann (LLNL), F. Albert, S.G. Ander-son, C.P.J. Barty, A.J. Bayramian, R.E. Bon-nanno, T.S. Chu, R.R. Cross, C.A. Ebbers,D.J. Gibson, T.L. Houck, R.A. Marsh, D.P. Mc-Nabb, M. J. Messerly, M. Shverdin, C. Siders(LLNL) C. Adolphsen, E.N. Jongewaard, Z. Li,T.O. Raubenheimer, S.G. Tantawi, A.E. Vlieks,J.W. Wang, F. Zhou (SLAC) V.A. Semenov(UCB)Continued progress in accelerator physics andlaser technology have enabled the developmentof a new class of tunable x-ray and gamma-raylight sources based on Compton scattering be-tween a high-brightness, relativistic electronbeam and a high intensity laser pulse producedvia chirped-pulse amplification (CPA). A pre-cision, tunable, monochromatic (< 0.4% rmsspectral width) source driven by a compact,high-gradient X-band linac designed in collabo-ration with SLAC is under construction at LLNL.High-brightness (250 pC, 3.5 ps, 0.4 mm.mrad),relativistic electron bunches will interact with aJoule-class, 10 ps, diode-pumped CPA laser pulseto generate tunable γ-rays in the 0.5-2.5 MeVphoton energy range. This gamma-ray sourcewill be used to excite nuclear resonance fluo-



rescence in various isotopes. Fields of endeavorinclude homeland security, stockpile scienceand surveillance, nuclear fuel assay, and wasteimaging and assay. The source design, key pa-rameters, and current status will be discussed,along with important applications, includingnuclear resonance fluorescence and high preci-sion medical imaging.

MOP006 Design Concepts of the PSI 250 MeV Injec-tor Test FacilityY. Kim (IUCF) H.-H. Braun, T. Garvey, M. Pe-drozzi, J.-Y. Raguin, V. Schlott (PSI)To develop advanced required technologies forthe SwissFEL project, PSI has been constructinga 250 MeV injector test facility. Its first beamcommissioning were started in February 2010. Inthis paper, we describe design concepts of RFphotoinjector, linac, bunch compressor, two spe-cial beam diagnostics sections for the PSI 250MeV injector test facility.

MOP007 SLAC Linac Preparations for FACETR.A. Erickson (SLAC)Submitted for the Sector 0-20 Core Team. TheSLAC 3km linear electron accelerator has beencut at the two-thirds point to provide beams totwo independent programs. The last third pro-vides the electron beam for the Linac CoherentLight Source (LCLS), leaving the first two-thirdsavailable for FACET, the proposed new experi-mental facility for accelerator science and testbeams. In this paper, we describe this separationand several projects to prepare the linac for theFACET experimental program.

MOP008 Reducing the Energy Spread of Recirculat-ing Linac by Non-isochronous Beam Dy-namicsR. Eichhorn (TU Darmstadt), A. Araz, J. Con-rad, F. Hug, M. Konrad, T. Quincey (TUDarmstadt)The Superconducting Linear Accelerator S-DALINAC at the University of Darmstadt (Ger-many) is a recirculating Linac with two recircula-tions. Currently acceleration in the Linac sectionis done on crest of the accelerating field. Therecirculation path is operated achromatic andisochronous. In this recirculation scheme theenergy spread of the resulting beam in the idealcase is determined by the electron bunch length.Taking into account the stability of the RF sys-tem the energy spread increases drastically. Inthis work we will present a new non-isochronousrecirculation scheme which helps canceling out



these errors from the rf-control. This schemeuses longitudinal dispersion in the recirculationpathes and an acceleration off-crest with a cer-tain phase with respect to the maximum. We willpresent beam dynamic calculations which showthe usability of this system even in a Linac withonly two recirculations and first experimentalresults

MOP009 Generation of Low-energy Electron BeamUsing KURRI-LINACT. Kubota (KURRI), N. Abe, J. Hori, T. Taka-hashi (KURRI)Electron beam can be accelerated in two accel-erator tubes up to 46 MeV at KURRI-LINAC. Thedevelopment of irradiation field is planned toprovide lower energy electron beam. For thispurpose we had regulated several parameters,which results showed that low energy electronbeam was obtained by acceleration in only thefirst accelerator tube, without the second one,which was filled with microwave from klystronoperated at reduced voltage. Moreover, the tim-ing between electron emission and microwaveintroduction into the first accelerator tube wasvaried to increase the electron energy loss in thesecond one, thereby reducing high-energy com-ponent of the beam. In this study we obtainlower energy electron beam by the following reg-ulations: 1) the increase of the emission currentfrom the electron gun relative to energy filledinto the first accelerator tube results in the de-crease of acceleration energy for each electronand 2) the total control of the timing and thebuncher phase of microwave and the width ofelectron pulse eliminates a part of electron ex-pected to be high-energy component. The reg-ulations described above yield the low-energyelectron beam with peak of 5.2 MeV.

MOP011 Injector Linac Upgrade for SuperKEKBT. Kamitani (KEK)The KEKB-factory will be upgraded for 40 timeshigher lumnosity (SuperKEKB). The injectorlinac is required to increase the beam intensi-ties (e-:1nC -> 5nC, e-:1nC -> 4nC) and reducethe emittances (e-:300 -> 20 um, e+: 2100 -> 10um ) for the SuperKEKB. A photo-cathode RF gunwill be introduced to generate the high-intensityand low-emittance electron beams. A positrondamping ring will be constructed to reduce theemittance. A new matching device (a flux con-centrator or a superconducing magnet) and anL-band capture section will be introduced to in-crease the positron intensity. Beam line layout



down to the damping ring will be rearranged tohave sufficient beam acceptance considering thepositron emitttance. This paper describes detailsof the upgrade scheme of the injector linac.

MOP012 Development of L-Band Positron CaptureAccelerator System in KEKB Injector LinacS. Matsumoto (KEK), M. Akemoto, T. Higo,H. Honma, M. Ikeda, K. Kakihara, T. Kami-tani, H. Nakajima, K. Nakao, Y. Ogawa,S. Ohsawa, Y. Yano, K. Yokoyama, M. Yoshida(KEK)In order to improve the positron beam inten-sity needed for super KEKB project, it was de-cided to replace the present S-band structuresin the positron capture section by a new L-band (1298MHz) accelerator system. A 2m longTW structure of 12MV/m gradient is now un-der idesign process while a 40MW klystron willbe delivered in summer. After the klystron test-ing, a single L-band accelerator unit will be con-structed for the structure study. The study isscheduled in next spring to operate the structureunder solenoidal magnetic focussing field.

MOP013 Distributed RF Scheme (DRFS) - Newly Pro-posed HLRF Scheme for ILCS. Fukuda (KEK)Basic configuration design (BCD) in SC ILC hasbeen studied assuming to employ 2 tunnel andthe reference design report (RDR) was released.However due to the high cost of construction,single tunnel plan has been discussed recently.Two typical plan, the klystron cluster scheme(KCS) and the distributed RF scheme (DRFS) areintensively studied in the team of global designeffort (GDE). In this report, detailed configura-tion of DRFS, which is newly proposed HLRFscheme for ILC and cost estimation comparedwith BCD are presented. Discussion about theavailability and maintenance plan are also pre-sented. Critical items are also listed up and fea-sibility plan of DRFS is described.

MOP014 Observation of Sub-THz Coherent Radia-tion from the Linac Beam Injected in theNewSUBARU Storage RingY. Shoji (LASTI)Sub-THz coherent synchrotron radiation (CSR)from the SPing-8 linac beam was observed afterthe injection into the NewSUBARU storage ring.The beam from the linac has much sorter bunchlength than the stationary stored bunch in thering. It had been reported that the injected linacbeam emits CSR at just after the injection until



it diluted to a longer bunch by its energy spread.However we observed CSR at after more revolu-tions. At some tens of microseconds after the in-jection we observed CSR produced by a fine timestructure in a bunch. At after more revolutions,a half of the synchrotron oscillation period (0.1ms), CSR was back because the bunch length be-came shorter again. At this timing we also expectCSR emitted from a structure produced by lon-gitudinal and transverse coupling, which shoulddepend on the chromaticity. We report results ofCSR observation through these periods.

MOP015 New Pump-Probe System Using the Coher-ent Radiation from a Linac Electron Beamat OPUS. Okuda (Osaka Prefecture University),T. Kojima, R. Taniguchi (Osaka PrefectureUniversity)Transient phenomena induced by pulsed elec-tron beams have been investigated with a pulse-radiolysis system with a 18 MeV S-band electronlinac at Osaka Prefecture University (OPU). Inour recent work the coherent transition radia-tion from the electron bunches of linac beams,which is highly intense pulsed light in a sub-millimeter to millimeter wavelength range, hasbeen applied to absorption spectroscopy withan L-band electron linac in the Research ReactorInstitute, Kyoto University. In these experimentsthe effect of intensity of the radiation has beenobserved for several kinds of matters. In thiswork a new pump-probe system has been de-veloped to investigate the transient phenomenainduced by the pulsed coherent radiation by im-proving the OPU pulse-radiolysis system. Thetransition radiation is emitted from an Al foil.A part of the coherent radiation is also used asprobe light. The pulse lengths of the radiationare from 5 ns to 4 µs. The characteristics of thesystem have been measured and the system hasbeen optimized. The coherent synchrotron ra-diation source is under preparation in order toobtain half-cycle light.

MOP016 Status of Tsinghua Thomson Scattering X-ray SourceW.-H. Huang (TUB), H. Chen, Q. Du, Y.-C. Du, Hua„J.F. Hua, R.K. Li, C.-X. Tang,L.X. Yan (TUB)Thomson scattering X-ray sources are compactand affordable facilities that produce ultra-fast,high flux, monochromatic, and tunable X-raypulses for science, medical and industrial ap-plications. Tsinghua Thomson scattering X-ray



(TTX) source for advanced X-ray imaging studiesand applications is under construction at the ac-celerator laboratory of Tsinghua University. Wehave successfully conducted the scattering ex-periment between electron beam from photo-cathode RF gun and TW laser beam. The opti-mization of the electron beam from booster linacand the upgrading of laser system are carried out.The plan for next scattering experiment is alsopresented.

MOP017 A Rescue Mode for the Diamond LightSource Pre-Injector LinacC. Christou (Diamond)The Diamond Light Source injection system con-sists of a 100MeV linac and a 3GeV full-energybooster. The injector is used to fill the storagering from empty and to provide beam for a 10minute top-up cycle. The high power RF forthe linac is generated by two S-band klystrons,the first powering a buncher and acceleratingstructure, and the second feeding a second ac-celerating structure. With the klystrons feedingthe two accelerating structures independently, afailure in the klystron or modulator feeding thelower energy structure and bunchers renders thelinac, and hence the injection system as a whole,inoperable. In order to address this problem,the RF feed to the linac has been reconfigured toenable either klystron to power the first structureand bunchers; this has involved a rebuild of thewaveguide network in the linac vault to includetwo four-way S-band switches, and the develop-ment of a lower energy operating mode for thelinac, booster and linac-to-booster transfer line.Details are presented in this paper of the instal-lation and test of the switching network, and thefirst results are reported of the new operatingmode.

MOP018 Commissioning Status of the DeceleratorTest Beam Line in CTF3S. Doebert (CERN), E. Adli, R.L. Lillestol,M. Olvegaard, I. Syratchev (CERN) D. Car-rillo, F. Toral (CIEMAT) A. Faus-Golfe,J.J. Garcia-Garrigos (IFIC)The CLIC Test Facility (CTF3) at CERN was con-structed by the CTF3 collaboration to study thefeasibility of the concepts for a compact linearcollider. The test beam line (TBL) recently addedto the CTF3 machine was designed to study theCLIC decelerator beam dynamics and 12 GHzpower production. The beam line consists ofa F0D0 lattice with high precision BPM’s andquadrupoles on movers for precise beam align-



ment. A total of 16 Power Extraction and TransferStructures (PETS) will be installed in between thequadrupoles to extract 12 GHz power from thedrive beam. The CTF3 drive beam with a bunch-train length of 140 ns, 12 GHz bunch repetitionfrequency and an average current over the trainof up to 28 A will be used. Each PETS structurewill produce 135 MW of 12 GHz power at nomi-nal current. The beam will have lost more than50 % of its initial energy of 150 MeV at the end ofthe beam line and will contain particles with en-ergies between 67 MeV and 150 MeV. The beamline is completely installed and the PETS struc-tures will be successively added until summer2011. The paper will describe the first results ob-tained during commissioning of the beam lineand the first PETS prototype.

MOP019 CLIC Ring to Main LinacF. Stulle (CERN), D. Schulte, J. Snuverink(CERN) A. Latina (Fermilab) S. Molloy (RoyalHolloway, University of London)The low emittance transport had been identifiedas one of the feasibility issues for CLIC. We dis-cuss beam dynamics challenges occurring in thebeam lines of the RTML connecting the damp-ing rings and the main linac. And we outlinehow these motivate design choices for the gen-eral RTML layout as well as its integration intothe overall CLIC layout. Constraints originat-ing from longitudinal dynamics and stabilizationrequirements of beam energy and phase at themain linac entrance are emphasized.

MOP020 CLIC Two-beam Module Design and Inte-grationA. Samoshkin (CERN), D. Gudkov, G. Rid-done (CERN)The CLIC (Compact LInear Collider) design isbased on two-beam acceleration concept devel-oped at CERN, where the RF power is generatedby a high current electron-beam (Drive Beam)running parallel to the Main Beam. The DriveBeam is decelerated in special power extractionstructures (PETS) and the generated RF poweris transferred via waveguides to the acceleratingstructures (AS). The accelerating gradient mustbe very high (100 MV/m) to reach the high en-ergy for the electron-positron collisions. To facil-itate the matching of the beams, components areassembled in 2-m long modules, of few differenttypes. In some of them the AS are replaced byquadrupoles used for the beam focusing. Theiralignment and positioning is made by using thesignals from the beam-position monitors (BPM).



Special modules are needed in damping regionor to carry out dedicated instrumentation andvacuum equipment. The module design and in-tegration has to cope with challenging require-ments from the different technical systems. Thispaper reports the status of the engineering de-sign and reports on the main technical issues.

MOP021 Compensation of Transient Beam-Loadingin the CLIC Main LinacA. Grudiev (CERN), A. Cappelletti, O. Kono-nenko (CERN)Compensating transient beam loading to main-tain a 0.01% relative beam energy spread is akey issue for the CLIC two-beam accelerationtechnique. The combination of short pulses,narrow bandwidth rf components and the lim-ited number of rf pulse shaping ’knobs’ given bythe drive beam generation scheme makes meet-ing this specification challenging. A dedicatedmodel, which takes into account all stages ofdrive beam generation, including the delay loopand combiner rings, the single-bunch responseof the power generation structure (PETS), the RFwaveguide network transfer function and disper-sive properties of the accelerating structure hasbeen developed. The drive beam phase switch-ing delays, resulting rf pulse shape, loaded andunloaded voltages and finally the energy spreadare presented.

MOP022 RF Measurement and Tuning of CLIC Ac-celerating Structure Prototypes at CERNA. Grudiev (CERN), A. Olyunin, J. Shi,W. Wuensch (CERN)An RF measurement system has been set up atCERN for use in the X-band accelerating struc-ture development program of the CLIC study.Using the system, S-parameters are measuredand the field distribution is obtained automati-cally by using a bead-pull technique. The correc-tions for tuning the structure are calculated fromthe result. Integrated software guides cell-by-celltuning to obtain the correct phase advance andminimum reflection at the operation frequency.The detailed configuration of the system, as wellas the semi-automatic tuning procedure, is pre-sented along with a few examples of measure-ment and tuning of CLIC accelerating structureprototypes.



MOP023 The Accelerating Structure for a 500 GeVCLICA. Grudiev (CERN), D. Schulte (CERN)The rf design of an accelerating structure for the500 GeV CLIC main linac is presented. The de-sign takes into account both aperture and HOMdamping requirements coming from beam dy-namics as well as the limitations related to rfbreakdown and pulsed surface heating. In addi-tion, the constraints related to the compatibilitywith 3 TeV CLIC have been taken into account.The structure is designed to provide 80 MV/m av-eraged accelerating gradient at 12 GHz with anrf-to-beam efficiency as high as 39.8 %.

MOP024 Status of the CLIC Phase and AmplitudeStabilisation ConceptD. Schulte (CERN), A. Andersson, S. Bet-toni, R. Corsini, A. Dubrovskiy, A. Gerbersha-gen, J.B. Jeanneret, G. Morpurgo, G. Sterbini,F. Stulle, R. Tomas (CERN) P. Burrows, C. Perry(JAI)In CLIC very tight tolerances exist for the phaseand amplitude stability of the main and drivebeam. In this paper we present the status ofthe CLIC beam phase and amplitude stabilisa-tion concept. We specify the resulting tolerancesfor the beam and technical equipment and com-pare to first measurements.

MOP025 ACE3P Computations of Wakefield Cou-pling in the CLIC Two-beam AcceleratorA.E. Candel (SLAC), K. Ko, L. Lee, Z. Li, C.-K. Ng, V. Rawat, G.L. Schussman (SLAC)A. Grudiev, I. Syratchev, W. Wuensch (CERN)The Compact Linear Collider (CLIC) providesa path to a multi-TeV accelerator to explorethe energy frontier of High Energy Physics. Itsnovel two-beam accelerator concept envisionsrf power transfer to the accelerating structuresfrom a separate high-current decelerator beamline consisting of power extraction and trans-fer structures (PETS). It is critical to numericallyverify the fundamental and higher-order modeproperties in and between the two beam lineswith high accuracy and confidence. To solvethese large-scale problems, SLAC’s parallel finiteelement electromagnetic code suite ACE3P isemployed. Using curvilinear conformal meshesand higher-order finite element vector basisfunctions, unprecedented accuracy and compu-tational efficiency are achieved, enabling high-fidelity modeling of complex detuned structuressuch as the CLIC TDA24 accelerating structure.In this paper, time-domain simulations of wake-



field coupling effects in the combined system ofPETS and the TDA24 structures are presented.The results will help to identify potential issuesand provide new insights on the design, lead-ing to further improvements on the novel CLICtwo-beam accelerator scheme.

MOP026 A Novel Alignment Procedure for the FinalFocus of Future Linear CollidersA. Latina (Fermilab) P. Raimondi (INFN/LNF)An algorithm for the simultaneous optimizationof orbit, dispersion, coupling and beta-beatingin the final focus of future linear colliders is pre-sented. Based on orbit and dispersion measure-ments the algorithm determines the optimalcorrector settings in order to simultaneouslyminimize the r.m.s orbit, the r.m.s dispersion,the r.m.s coupling, the r.m.s. beta-beating andthe r.m.s strength of the dipoles correctors. Anumber of different options for error handling ofbeam position monitors, weighting, and correc-tion have been introduced to ensure the stabilityof the algorithm. A sextupole tuning procedureis also applied to further optimize the beam pa-rameters at the interaction point. Results forthe beam delivery systems of ILC and CLIC arepresented.

MOP027 Distributed RF Scheme (DRFS) - Newly Pro-posed HLRF Scheme for ILCS. Fukuda (KEK)Distributed RF Scheme (DRFS) was proposedfor International Linear Collider (ILC) as a newHLRF scheme. After the ITRP recommenda-tion, ILC technology was chosen to be super-conducting technology and basic design was dis-cussed and reported in the RDR on 2007. Aim-ing for the cost reduction, there have been pro-posed many ideas and summarized as SB2009proposal. DRFS is the one of these proposals,and it is linked to the single tunnel plan. DRFSemploys many small klystrons (750kW outputpower) which feed power to two superconduct-ing cavities. 13 modulating anode klystrons areoperated by a DC power supply and a modulat-ing anode pulser. All required components areinstalled in a tunnel and therefore this schemeis a complete single tunnel layout. DRFS wasproposed in 2008 and thereafter it has been dis-cussed in web-ex meeting and GDE workshop.In this conference, concept and detailed designof DRFS are presented including the availabilityand operability. In order to show the feasibilityof DRFS, KEK has a plan of demonstration em-



ploying the DRFS with two klystrons in the S1global in the end of 2010. Presenter also dis-cussed pros and cons comparing with the com-peting proposed scheme.

MOP028 ILC Conventional Facility in Asian RegionalTunnel ConfigurationA. Enomoto (KEK)The international linear collider (ILC) project isabout to meet the technical design phase 2, ofwhich the goal is to establish a realistic design bythe end of 2012. Single-tunnel accelerator con-figuration is one of the most essential improve-ments to reduce the construction costs. The orig-inal design involves two tunnels which house theaccelerator cavities and the power supplies sep-arately, having such advantages as we can enterthe power-supply tunnel even during beam op-eration. Although the single tunnel configura-tion sacrifices these functions, it saves big tun-nel construction costs. The Asian team is study-ing a regional single-tunnel accelerator configu-ration to match the Asian site feature in conjunc-tion with a compact high-level RF scheme calleddistributed RF system (DRFS). The design con-cepts have been developed by a conventional fa-cility working group in the advanced acceleratorassociation (AAA) which involves a collaborationamong academic, industrial, and political com-munities in Japan. Not only cost reduction butalso functional impacts of tunnel configurationon things such as life safety are discussed in thispaper.

MOP029 S0-studies on ICHIRO 9-cell Cavities in Col-laboration with KEK and JlabF. Furuta (KEK), K. Saito (KEK) T. Konomi(Sokendai)In 2008, KEK and Jlab did the collaboration ofS0-study on ICHIRO 9-cell #5 which has no endgroups on beam tubes. As S0 tight loop test, sur-face treatments and vertical tests were repeatedon ICHIRO#5 at both of Jlab and KEK. Maximumgradients of 36.5MV/m at Jlab and 33.7MV/m atKEK were achieved so far. In this year, 2010, KEKand Jlab started new S0-study collaboration onICHIRO 9cell #7 which has full end groups onbeam tubes. ICHIR#7 was already sent to Jlaband VT as received was done. We will report theresults of tight loop tests at Jlab.

MOP030 Status of Superconducting Cavity for ILC atMHIH. Hitomi (MHI)MHI’s activities for ILC project will be shown.



MOP031 Industrial Electron Accelerators ILUA.A. Bryazgin (BINP SB RAS), V.V. Bezuglov,K.N. Chernov, B.L. Faktorovich, A.N. Lukin,I. Makarov, V.E. Nekhaev, G.N. Ostreiko,A.D. Panfilov, V.V. Tarnetsky, M.A. Tiunov,V.O. Tkachenko, L.A. Voronin (BINP SB RAS)The industrial electron accelerators type ILU aredeveloped and produced by the Budker Insti-tute of Nuclear Physics. The ILU accelerators areworking in many countries in the industrial linesas well as in some research establishments start-ing from the beginning of 70-s. These machinesare the pulse RF type accelerators with relativelylow working frequency ’ 120MHz for ILU-6 andILU-10 and 180MHz for ILU-8. Their energyrange is from 0.8MeV (ILU-8) to 5MeV (ILU-10),beam power is up to 50kW. The new ILU-14 ma-chine for energy range 7.5-10MeV is on the finalstage of development. The ILU machines areworking in various technological processes ’ ra-diation modification of polymer tubes and films,polymer pipes for hot water supply, wires, ca-bles, sterilization of single use medical products(syringes, hospital and operation gowns, sets foroperations, etc.), decontamination of the medic-inal raw. The ILU accelerators are equipped withseveral beam extraction devices ’ linear scannerand scanners with 4 windows permitting to orga-nize the irradiation of the long products (tubes,cables, wires, pipes) from 4 sides

MOP032 Application of X-band Linac for MaterialRecognition with Two Fold Scintillator De-tectorK. Lee (The University of Tokyo, NuclearProfessional School), S. Hirai, M. Uesaka(The University of Tokyo, Nuclear Profes-sional School) E. Hashimoto (JAEA) T. Natsui(UTNL)950 keV X-band Linac has the merits of compactsystem, and it does not need the radiation safetymanager on-site in the public space. Thereforethe system we have developed is suitable for themore safe circumstance in airport. Dual energyX-ray concept is introduced for material recog-nition with Linac these days, because it producehigh energy X-ray which is available in case thetarget is thick and high atomic number material.We suggest two fold scintillator detector conceptto induce dual energy X-ray effect. The design oftwo fold scintillator is decided by MCNP simula-tion with two scintillator code, CsI and CdWO4.The material recognition is confirmed using alu-minium, iron and lead metal in conditions suchas various thicknesses and containers.



MOP033 RF Design for a Low Energy X-Band Accel-eratorP.K. Ambattu (Cockcroft Institute, LancasterUniversity), G. Burt, M.I. Tahir (CockcroftInstitute, Lancaster University) P.A. Corlett,P.A. McIntosh, A.J. Moss (STFC/DL/ASTeC)Compact X-ray sources are integral parts of sys-tems used in medical, industrial and security ap-plications. The X-ray dose rate for a particularapplication mainly depends on the energy andcurrent of the beam used to hit the target, usu-ally made of tungsten. In applications that needhigher penetration (100s of mm in steel), thebeam energy needed is in the range of 1-5 MeVwhich can only be obtained using an RF linearaccelerator. In order to reduce the size of thelinac, higher RF frequencies (X-band) should beused while in order to reduce the overall bulk, RFfocusing is employed instead of solenoidal focus-ing. Thus the main attraction of an X-band linaccompared to a lower frequency version is theamount of lead required for shielding the system,and hence its weight. For capturing and bunch-ing the low energy dc beam, a bunching section isneeded in front of the main linac. The bunchingcavity can either be a part of the main linac cav-ity or an independently powered section whichcan be used for certain specific applications as ashorter 1 MeV linac. In this paper, the design andsimulations of an X-band buncher to be suitablefor compact X-ray sources is presented.

MOP034 Observation of Ozone Explosion of LiquidNitrogen Induced by Irradiation with Elec-tron Linear AcceleratorR. Taniguchi (Osaka Prefecture University),N. Ito, T. Kojima, S. Okuda (Osaka PrefectureUniversity)A pulsed electron radiography system has beendeveloped, which consisted of an electron lin-ear accelerator, a scintillation screen and a highsensitivity image sensor. The system was capa-ble for high speed strobo-imaging by the use ofthe pulse feature of the electron beam with thepulse width about a few micro-second. On theother hand, the characteristics of electron im-ages were different from X-ray images and neu-tron images. Absorption behavior of energeticelectrons in materials is Bragg-like rather thanexponential. Therefore, a high contrast trans-parent image was obtained by modulating of en-ergy of the electron beam. By the use of thissystem and utilizing these features, we observedsuccessfully an ozone explosion phenomenon ofliquid nitrogen induced by electron irradiation,



which has been considered to be a serious prob-lem in material irradiation experiments.

MOP035 Beam Commissioning of L-band IntenseElectron AcceleratorW. Namkung (POSTECH), M.-H. Cho,S.D. Jang, S.H. Kim, S.J. Park, H.R. Yang(POSTECH) K.H. Chung, K. Lee (KAPRA) J.-S. Oh (NFRI)An intense L-band electron accelerator is nowbeing commissioned at ACEP (Advanced Centerfor Electron-beam Processing in Cheorwon, Ko-rea) for irradiation applications in collaborationwith POSTECH (Pohang University of Scienceand Technology) and KAPRA (Korea Acceleratorand Plasma Research Association). It is capa-ble of producing 10-MeV electron beams withaverage 30 kW. For a high-power capability, weadopt an L-band traveling-wave acceleratingstructure operated with the fully-beam-loadedcondition. The regenerative-BBU instabilitydue to high beam current was suppressed withsolenoidal magnetic fields. In this paper, wepresent commissioning status with measure-ment of the beam energy and current.

MOP036 Commissioning Status of C-band Standing-wave AcceleratorW. Namkung (POSTECH), M.-H. Cho,S.D. Jang, S.H. Kim, S.J. Park, H.R. Yang(POSTECH) K.H. Chung, K. Lee (KAPRA) J.-S. Oh (NFRI)A C-band standing-wave electron linac fora compact hard X-ray source is now beingcommissioned at ACEP (Advanced Center forElectron-beam Processing in Cheorwon, Korea).It is designed to produce 4-MeV electron beamwith pulsed 50-mA, using a 5-GHz RF power gen-erated by a magnetron with pulsed 1.5 MW andaverage 1.2 kW. The accelerating structure is abi-periodic and on-axis-coupled one operatedwith π/2-mode standing-waves. It is consisted of3 bunching cells, 6 accelerating cells and a cou-pling cell. After the tuning of the actual column,the resonant frequency is 4999.17 MHz at theπ/2-mode, the coupling coefficient is 0.92 andthe field flatness is less than 2%. In this paper,we present commissioning status with details ofthe linac system.

MOP037 A Nearly Independent, Low-Rigidity Trans-port Lattice Embedded into a High-RigidityLatticeM.G. Tiefenback (JLAB)The linac optics of the CEBAF recirculating ac-



celerator simultaneously transports up to fivebeams of different rigidity within a commonchannel. The focusing strength of the linaclattice is limited by the single-particle stabilityboundary of that structure for the lowest re-quired rigidity. The focusing progressively weak-ens (and beta increases) for increasing rigid-ity. The CEBAF FODO lattice performs well overmoderate rigidity ratios. In studying ways to in-crease the linac focusing strength for the higheracceleration passes, we devised a lattice consist-ing of two coincident structures. The low-rigiditypart, reasonably described as an ’embedded lat-tice,’ consists of strong symmetric triplets. Lat-tice elements for the higher-rigidity beams arelocated at the small-beta waists of the tripletstructure, rendering them ineffective upon thelow-rigidity beam well beyond the usual enve-lope stability limit for that beam. The residual fo-cusing strength for the high-rigidity beam can bemuch greater than is possible for a simple FODOstructure. The triplets are themselves ineffectiveupon the high-rigidity beams. CEBAF optics andanalogues are used to illustrate.

MOP039 First Beams Produced by the SPIRAL-2 In-jectorsJ.-L. Biarrotte (IPN) P. Bertrand (GANIL)C. Peaucelle (IN2P3 IPNL) T. Thuillier (LPSC)O. Tuske, D. Uriot (CEA)The SPIRAL-2 superconducting linac driver,which aims at delivering 5 mA, 40 MeV deuteronsand up to 1 mA, 14.5 A.MeV q/A=1/3 heavyions, has now entered its construction phasein GANIL (Caen, France). The linac is composedof two injectors feeding one single RFQ, fol-lowed by a superconducting section based on 88MHz independently-phased quarter-wave cavi-ties with room-temperature focusing elements.The first stages of the injectors have been fullybuilt and are now operational. They have beenpartly commissioned with beam in Grenoble andSaclay in 2010. This paper describes the resultsobtained so far in this context.

MOP040 Advanced UNILAC Upgrade for FAIRH. Vormann (GSI), W.A. Barth, W. Vinzenz,S.G. Yaramyshev (GSI) A. Kolomiets, S. Mi-naev (ITEP) U. Ratzinger, A. Schempp,R. Tiede (IAP)To provide for the high beam currents as requiredof the FAIR project, the GSI Unilac High CurrentInjector (HSI) must deliver 18 mA of U4+ ionsat the end of the prestripper section. With thedesign existing up to 2008, the RFQ could not



reach the necessary beam currents at the RFQoutput, as simulations had shown. Furthermore,parts of the existing LEBT must be modified, anda new straight source branch must be added toprovide for the full required beam current. As afirst step of an HSI frontend upgrade, the RFQhas been modernized in summer 2009 with acompletely new electrode design. Commission-ing of the HSI has shown that the transmissionof the RFQ increased significantly (from 55% to85% in high current Uranium operation, 95% inmedium current operation). As expected, furtherbottlenecks for the transmission of the completeHSI (matching LEBT-to-RFQ, matching to theSuperlens) have been detected. An upgrade ofLEBT magnets is foreseen for 2010, the additionallinear source branch will follow.

MOP041 The Superconducting CW-LINAC-Demon-strator at GSIS. Mickat (GSI), W.A. Barth, L.A. Dahl,M. Kaiser (GSI) F.D. Dziuba, H. Podlech,U. Ratzinger (IAP)GSI applied for a new superconducting (sc) cw-LINAC in parallel to the existing UNILAC. Sucha machine is highly desirable with respect tothe progress in the field of Superheavy Elements(SHE) for example. The UNILAC at GSI is limitedin providing a proper beam for SHE and in ful-filling the requirements for FAIR simultaneously.A sc CH-structure is the key component of theproposed efficient and compact linac. In firstvertical rf-tests at the Institute of Applied Physics(IAP) maximum gradients up to 7 MV/m wereachieved. The cavities for the cw-LINAC shouldbe operated at 217 MHz providing gradients ofabout 5.1 MV/m at a total length of minimum0.6 m . In a first step a prototype of such a sccw-LINAC as a demonstrator is financed by theHelmholtz Institute Mainz (HIM). The demon-strator is the first section of the proposed cw-LINAC consisting of a sc CH-cavity embedded bytwo sc solenoids. The aim is a full performancetest of the demonstrator with beam at the GSIhigh charge injector (HLI) in 2013. Presentlythe tendering of the solenoids, the cavity, thecryostat and the rf-amplifier is in preparation.

MOP042 UNILAC Upgrades for Coulomb Barrier En-ergy ExperimentsL.A. Dahl (GSI), W.A. Barth, P. Gerhard,S. Mickat, W. Vinzenz, H. Vormann (GSI)A. Schempp, M. Vossberg (IAP)The GSI linear accelerator UNILAC providesheavy ion beams at Coulomb barrier energies for



search and study of super heavy elements. Typ-ical cross-sections of 55 fb require beam dosesof 1.4·1019 according to a beam time of 117 days.Several upgrades will reduce the beam time toonly 16 days. A second injection branch with a28GHz-MS-ECRIS anticipates a factor of 10 inparticle intensity. By a new cw rfq-structure allaccelerator tanks are suitable for a duty cycle ofat least 50% instead of 25% presently. Due tothis, thermal power increase of 19 rf-amplifierseased by higher ion charge states of the ECRISis necessary. Finally the UNILAC timing systemcontrolling 50Hz pulse-to-pulse operation of upto six beams differing in ion species and energyhas to be modified considering beam diagnos-tics electronics and pulsable magnets. The frontend comprising ECRIS, rfq- and IH-structure iscw suitable and will serve as injector for a newfuture sc-cw-linac.

MOP043 HITRAP - A Decelerator for Heavy Highly-charged IonsF. Herfurth (GSI), W.A. Barth, G. Clemente,L.A. Dahl, P. Gerhard, M. Kaiser, H.J. Kluge,C. Kozhuharov, M.T. Maier, W. Quint,T. Stoehlker, G. Vorobjev (GSI) B. Hofmann,J. Pfister, U. Ratzinger, A.C. Sauer, A. Schempp(IAP) O.K. Kester (NSCL)Heavy, highly-charged ions (HCI) with only oneor few electrons are interesting systems for pre-cision experiments as for instance tests of thetheory of quantum electrodynamics (QED). Toachieve high precision, kinetic energy and spatialposition of the ions have to be well controlled.This is in contradiction to the production pro-cess that employs stripping of electrons at highenergies by sending relativistic highly-chargedions with still many electrons through matter.In order to match the production at 400 MeV/u with the requirements of the experiments -stored and cooled HCI at low energy - the lineardecelerator facility HITRAP has been built at theexperimental storage ring (ESR) at GSI in Darm-stadt. The ions are first decelerated in the ESRfrom 400 to 4 MeV/u, cooled and extracted. Theion beam phase spaces are then matched to anIH-structure, decelerated from 4 to 0.5 MeV/ubefore a 4-rod RFQ reduces the energy to 6 keV/u. Finally, the HCI are cooled in a Penning trapto 4 K. Extensive ion optical calculations wereperformed and in recent tests up to one millionhighly-charged ions have been decelerated from400 MeV/u to 0.5 MeV/u.



MOP044 High Current U40+-operation in the GSI-UNILACW.A. Barth (GSI), G. Clemente, L.A. Dahl,P. Gerhard, L. Groening, M. Kaiser, M.T. Maier,S. Mickat, H. Vormann (GSI)A low current high duty factor U10+-beam fromthe Penning Ion Source as well as a high cur-rent low duty factor U4+-beam from a MeVVasource were used for machine investigations inthe GSI-UNILAC and synchrotron (SIS18). Car-bon stripper foils (20, 40 and 50 ug/cm2) weremounted in the gas stripper section at 1.4 MeV/u to provide for highly charged uranium ions(40+) to be delivered to the SIS18 for life timebeam measurements. High current tests wereperformed to check the durability of the carbonfoils. No measurable variation of the strippedlow and high current beam in the poststripperDTL could be detected during the life time of thefoils. An U40+-beam current of up to 1.0·10+11

particles per 100mues could be reached in thetransfer line to the SIS18. This paper will re-port on the investigations of stripper foils withdifferent thickness. Additionally long time ob-servation of all relevant beam parameters (trans-verse emittance, energy spread and energy loss,bunch shape, beam transmission up to the SIS-injection) are presented.

MOP045 Efficiency and Intensity Upgrade of the AT-LAS FacilityP.N. Ostroumov (ANL), R.V.F. Janssens,M.P. Kelly, S.A. Kondrashev, B. Mustapha,R.C. Pardo, G. Savard (ANL)ANL Physics Division is pursuing a major up-grade of the ATLAS National User Facility. Theoverall project will dramatically increase thebeam current available for the stable ion beamresearch program, increase the beam intensityfor neutron-rich beams from Californium RareIsotope Breeder Upgrade (CARIBU) and improvethe intensity and purity of the existing in-flightrare isotope beam (RIB) program. The projectwill take place in two phases. The first phase isfully funded and focused on increasing the in-tensity of stable beams by a factor of 10. This willbe done using a new normal conducting, CWRFQ accelerator and replacing three cryostats ofsplit-ring resonators with a single new cryostatof high-performance quarter-wave resonators.To further increase the intensity for neutron-richbeams, we have started development of a high-efficiency charge breeder for CARIBU based onan Electron Beam Ion Source. The goal of theproposed second phase will be to increase the



energies and intensities of stable beams, as wellas, increase the efficiency and beam current forCARIBU and in-flight RIB beams. The focus ofthis paper is on innovative developments forPhase I of the project.

MOP046 Status and Plans for the Facility for RareIsotope Beams at Michigan State UniversityR.C. York (NSCL), G. Bollen, M. Doleans,W. Hartung, M.J. Johnson, G. Machicoane,F. Marti, X. Wu, Q. Zhao (NSCL) T . Glas-macher, E. Pozdeyev, E. Tanke (FRIB)The primary purpose of the Facility for Rare Iso-tope Beams (FRIB) is to produce and to do fun-damental research with rare isotopes. The rareisotope production will be accomplished usinga heavy ion cw linac to provide a stable isotopebeam (protons through uranium) at high power(up to 400 kW) and high energy (>200 MeV/u) ona particle fragmentation production target. Therare isotopes will be produced in quantities suffi-cient to support world-leading research by usingparticle fragmentation of stable beams. This willinclude research pertaining to the properties ofnuclei (nuclear structure), the nuclear processesin the universe and tests of fundamental sym-metries. Societal applications and benefits mayinclude bio-medicine, energy, material sciencesand national security. The overall facility statusand plans will be discussed with a focus on theaccelerator system.

MOP047 The Overview of the Accelerator Systemfor the Facility for Rare Isotope Beams atMichigan State UniversityX. Wu (NSCL), M. Doleans, W. Hartung,M.J. Johnson, F. Marti, R.C. York, Q. Zhao(NSCL) E. Pozdeyev, E. Tanke (FRIB)The Facility for Rare Isotope Beams (FRIB) willaccelerate stable beams of heavy ions to > 200MeV/u with beam powers of up to 400 kW ontoan in-flight fragmentation target to produce rareisotopes. The accelerator system will include aroom-temperature front end, a double-foldedsuperconducting driver linac, and a beam de-livery system. The front end will include super-conducting ECR ion sources, a beam bunchingsystem and a radio frequency quadrupole. Thedriver linac will include three acceleration seg-ments using superconducting quarter-wave andhalf-wave cavities with frequencies of 80.5 and322 MHz, and two 180 degree folding systems tominimize the cost of conventional construction.Charge-stripping and multi-charge-state beamacceleration will be used for the heavier ions



to increase acceleration efficiency. The beamdelivery system will transport accelerated stablebeams to the in-flight fragmentation target. End-to-end beam simulations with errors have beenperformed to evaluate the performance of thedriver linac. We will discuss recent progress inthe accelerator design and the beam dynamicsstudies for the baseline accelerator system.

MOP048 Experimental Study of the Surface Resis-tance of the 141 MHz Quarter-Wave Res-onator at TriumfD. Longuevergne (UBC & TRIUMF)C.D. Beard, A. Grassellino, P. Kolb, R.E. Lax-dal, V. Zvyagintsev (TRIUMF)The upgrade (Phase II) of the ISAC-II supercon-ducting linac has been completed this spring andhas been commissioned. Two spare 141 MHzQuarter-Wave Resonators made of bulk Niobiumare available at TRIUMF to lead more specificstudies on surface resistance. This opportunityhas also been taken to optimize the surface treat-ment to improve the accelerating field gradientat the operating power level. The aim of the studypresented here is to link together several surfacetreatments (etching depth, 120C baking) andtest conditions (Q-disease, 4.2 K and 2K tests)and sequence them in an appropriate order tounderstand more deeply their dependencies.

MOP049 Electro-Magnetic Optimization of aQuarter-Wave ResonatorB. Mustapha (ANL), P.N. Ostroumov (ANL)A new cryomodule is being designed for the on-going ATLAS efficiency and intensity upgrade.The cryomodule consists of 7 Quarter-WaveResonators (QWR) with β-G=0.075 and 4 SCsolenoids to replace the existing split-ring cavi-ties. To reduce the resonator frequency jitter dueto micro-phonics we choose a frequency of 72.75MHz instead of 60.625 MHz. At 72.75 MHz, thecavity is shorter by about 20 cm. The choice ofthe design β was optimized based on the beamdynamics and the actual performance of ATLAScavities. To reach a record high accelerating volt-age of 2.5 MV per cavity or higher, the EM designwas carefully optimized. The main goal of theoptimization was to minimize the peak magneticand electric fields while still keeping good valuesfor the stored energy, the shunt impedance (R/Q) and the geometric factor (Rs/Q). The cavityheight was also another important parameter.The optimization has lead to a final shape whichis cylindrical in the bottom and conic on the topkeeping a high real-estate gradient. The opti-



mization also included the internal drift tubeface angle required for beam steering correction.

MOP050 Beam Commissioning of the ISAC II Super-conducting Linac UpgradeM. Marchetto (TRIUMF), C.D. Beard, P. Kolb,R.E. Laxdal, F. Yan, V. Zvyagintsev (TRIUMF)D. Longuevergne (UBC & TRIUMF) A.P. Man-gerel (UW/Physics)ISAC is TRIUMF facility for the production andpost acceleration of radioactive ion beams. Thepost acceleration chain is composed of two nor-mal conducting linacs (RFQ and DTL) that ac-celerate stable and radioactive beams with 2≤A/Q≤6 up to 1.8 MeV/u followed by a Supercon-ducting (SC) LINAC. The SC linac was installed intwo phases: a medium and a high beta section.The medium beta section installation was com-pleted and commissioned in 2006 and it is oper-ational since then. It consists of five cryomoduleseach hosting four bulk niobium quarter wavecavities operating at 106MHz. A superconduct-ing solenoid is installed in each cryomodule toprovide transverse focusing. The high beta sec-tion is an upgrade in energy. The installationwas completed recently and the beam commis-sioning is underway. This section is composedof three cryomodules hosting respectively six, sixand eight bulk niobium quarter wave cavities op-erating at 141 MHz. A superconducting solenoidis also present in each of the new cryomodule.The new cavities are expected to deliver an ef-fective voltage of 1 MV each boosting the total to40 MV. In this paper we present the results of thebeam commissioning.

MOP051 Tests of the MEBT Rebuncher for the SPI-RAL 2 DriverM. Lechartier (GANIL), M. Di Giacomo,J.F. Leyge (GANIL)The Spiral 2 project [1] uses normal conductingrebunchers to accelerate high intensity beams ofprotons, deuterons and heavier ions. All cavitieswork at 88 MHz, the beta is 0.04 and 3 rebunch-ers are located in the MEBT line, which acceptsions with A/q up to 6. The paper describes the RFdesign and the technological solutions proposedfor an original 3-gap cavity, characterised by verylarge beam holes (60mm) and providing up to120 kV of effective voltage .It describes the testbench to qualify the high voltage performances.



MOP053 Testing of Super Conducting Low-beta 704MHz Cavities at 50 Hz Pulse Repetition Ratein View of SPL - First ResultsW. Höfle (CERN), M. Hernandez Flano,D. Valuch (CERN) S. Chel, M. Desmons, O. Pi-quet (CEA) R. Paparella, P. Pierini (INFN/LASA)In the framework of the preparatory phase for theluminosity upgrade of the LHC (SLHC-PP ) it isforeseen to characterize two superconducting RFcavities and demonstrate compliance of the re-quired SPL field stability in amplitude and phaseusing a prototype LLRF system. We report on thepreparation for testing of two super-conductinglow-beta cavities at 50 Hz pulse repetition rateincluding the setting-up of the low level RF con-trol system to evaluate the performance of thepiezo-tuning system and cavity field stability inamplitude and phase. Results from tests with50 Hz pulse repetition rate are presented. Simu-lations of the RF system are used to predict thenecessary specifications for power and band-width to control the cavity field and derive spec-ifications for the RF system and its control.

MOP054 The HIE-ISOLDE Project at CERN: Statusand Future PerspectivesM. Pasini (CERN), R. Catherall, Y. Kadi(CERN)The HIE-ISOLDE project at CERN aims at the in-crease of energy, intensity and quality of the postaccelerated Radioactive Ion Beam at ISOLDE.The recent approval of the project from theCERN management will satisfy the huge demandof nuclear physicists for more exotic and moreenergetic beams, allowing to reach in a first stage5.5 MeV/u (to be ready by 2013) and in a sec-ond stage to reach 10 MeV/u by 2015 (this latterdate is depending on funding availability). Thisis achieved by a major refurbishment of the tar-get area and with the installation of new super-conducting linac based of sputtered SC QuarterWave Resonators (QWRs). The paper describesthe different R&D phases and outlines differentscenarios of the project.

MOP055 A CW SRF Linac to Drive Subcritical Nu-clear ReactorsM. Popovic (Fermilab) C.M. Ankenbrandt,R.P. Johnson (Muons, Inc)In the last 20 years, superconducting RF (SRF)cavities have been developed to the point thata CW SRF linac is the best candidate driverfor subcritical reactors. We discuss how oneappropriately designed linac can be used for



an accelerator-driven subcritical (ADS) nuclearpower station to produce more than 5 GW elec-trical power in an inherently safe region belowcriticality. Such a station will generate no green-house gases, produce minimal nuclear waste andno byproducts that are useful to rogue nationsor terrorists, incinerate waste from conventionalnuclear reactors, and efficiently use abundantthorium fuel that does not need enrichment. Wedescribe the Linac parameters that can enablethis vision of an almost inexhaustible source ofpower and we discuss how the corresponding re-actor technology can be matched to these pa-rameters.

MOP056 Status of the ALPI Low-beta UpgradeA. Facco (INFN/LNL), F. Scarpa (INFN/LNL)Y. Ma (CIAE)The low-beta section of the ALPI linac at Labo-ratori Nazionali di Legnaro is being upgraded inorder to double its energy gain from about 10MV to 20 MV. This upgrade, performed with arather limited investment in the background ofthe standard accelerator activities, is based onthe replacement of some rf system componentsand minor modifications to the cryostats. Thecavities, working at 80 MHz, require a 3 dB rfbandwidth of 15 Hz (obtained by means of strongovercoupling) to be locked in the presence of thelarge Helium pressure fluctuations of ALPI. Theiraverage gradient, although exceeding 6 MV/m atthe nominal 7 W power, is presently kept around3 MV/m during operation, limited by the max-imum available rf power in the linac. The on-going upgrade requires the modification of alllow-beta cryomodules to allow new, liquid Ni-trogen cooled rf couplers and new, 1 kW ampli-fiers. A fully equipped prototype cryostat withfour, beta=0.047 QWRs has been constructed andtested on line, and operated at 6 MV/m reachingor exceeding all the design goals. The test resultswill be reported and discussed and the projectstatus will be presented.

MOP057 A CW Operated Superconducting HeavyIon CH-Type Linac for Super-Heavy Ele-ment Research at GSIH. Podlech (IAP), M. Busch, F.D. Dziuba,U. Ratzinger, R. Tiede (IAP) W.A. Barth,S. Mickat (GSI)The search for Super-Heavy Elements (SHE) isone of the frontiers in nuclear physics. By trendthe production cross sections decrease signif-icantly for larger proton numbers and heaviernuclei, respectively. To limit the required beam



time it is necessary to use the highest availableintensity. This prefers cw operation and the useof superconducting cavities. A cw operated su-perconducting linac using CH-cavities at GSIhas been designed. As front end the existing 108

MHz High Charge Injector (HLI) will be usedwhich is presently being upgraded for cw op-eration. The superconducting part of the linaccovers the energy between 1.4 AMeV and 7.5AMeV. It consists of 9 multi-cell CH-cavities op-erated at 217 MHz. Each cavity is optimized for aspecific particle velocity but without beta profile.Above 3.5 AMeV the linac is fully energy variable.The first superconducting CH-cavity is alreadyunder construction and will be tested with beamdelivered by the HLI. The talk covers the devel-opment of the prototypes and the overall designincluding beam dynamics issues.

MOP058 A Test Bench for the Heidelberg Ion BeamTherapy CentreR. Cee (HIT), E. Feldmeier, M. Galonska,Th. Haberer, J.M. Mosthaf, A. Peters, S. Sche-loske, T.W. Winkelmann (HIT)The Heidelberg Ion Beam Therapy Centre (HIT)is the only medical facility in Europe for can-cer treatment with protons and carbon ions. Tobroaden the range of available ion species to-wards helium the low energy beam transport(LEBT) will be extended by a third ion source andthe associated spectrometer section. Following anovel ion optical approach the LEBT-branch hasbeen redesigned. A dedicated test bench will beused to commission and validate the new designprior to its integration into the medical acceler-ator. In its final stage the test bench will com-prise an ECR-ion source, a LEBT and an RFQ withdiagnostics line. It opens up the unique oppor-tunity to perform comprehensive investigationsnot only of the ion source but also of other de-vices like the RFQ which have been optimised inthe frame of the LINAC upgrade. Here, particu-lar emphasis will be placed on the new design ofthe analyser dipole and the macro pulse chopper.Furthermore results of beam optical simulationsand first measurement results will be presented.

MOP059 Continued Development of a 2.5-MeV RFILinac SystemD.A. Swenson (Linac Systems, LLC)A 2.5-MeV, 20-mA, Cw Linac System is nearingcompletion at Linac Systems, LLC. The intendedapplication is to produce abundant quantities ofepithermal neutrons for the BNCT medical ap-plication. The operating frequency is 200 MHz.



The linac structure consist of a radial strut RFQlinac section to an energy of 0.75 MeV and anRFI linac section to the final energy of 2.5 MeV.The two linac structures are resonantly coupledby a quarter-wave-stub resonant coupler, whichlocks the relative phases and relative field ampli-tudes of the two structures. The rf power is loop-coupled to the RFQ section, and the power re-quired for the RFI section is transmitted throughthe resonant coupler. The ion source is anECR microwave type, operated at 25 keV. TheLEBT includes dual magnetic solenoid focusinglenses and independent x and y steering mag-nets. The final amplifier of the rf power systemis a cavity-based amplifier with 6 CPI/Eimac YC-300A power tubes in parallel. The peak and aver-age power output is 180 kW cw. The current sta-tus of the system will be described.

MOP060 The Compact Injector as the Second Injec-tor of the HIMACY. Iwata (NIRS), T. Fujisawa, T.M. Mu-rakami, M. Muramatsu, K. Noda (NIRS)Y.K. Kageyama, I. Kobayashi, T. Sasano,T. Takeuchi (AEC)A compact injector, consisting of the permanent-magnet ECR ion-source, the RFQ linac and thealternating-phase-focused interdigital H-modedrift-tube-linac (APF IH-DTL), was developedfor an injector of medical-accelerator facilities,dedicated for the heavy-ion cancer therapy. Theinjector can accelerate heavy-ions having q/m=1/3 up to 4 MeV/u. Beam acceleration testsof the compact injector were successfully madeat the National Institute of Radiological Sciences(NIRS), and the results of the acceleration testsproved its excellent performance*. The same de-sign was used for the injector, constructed at theHeavy Ion Medical Center in the Gunma Univer-sity. Our compact injector was recently installedin the HIMAC, and will be used as the secondinjector of the HIMAC. The new beam transportline for the compact injector was constructed inconjunction with the existing transport line. Theentire injector system of the HIMAC acceleratorcomplex will be presented.

MOP061 Exploring the Energy/Beam Current Pa-rameter Space for the Isotope ProductionFacility (IPF) at LANSCEM.S. Gulley (LANL), H.T. Bach, L.J. Bitteker,K.D. John, F.M. Nortier, C. Pillai, F.O. Valdez(LANL) A. Seifter (EPO)IPF has recently investigated isotope productionwith proton beams at energies other than the



100-MeV currently available to the IPF beam line.To maximize the yield of a particular isotope, itis necessary to measure the production rate andcross section versus proton beam energy. Studieswere conducted at 800 MeV and 197 MeV to de-termine the cross section of terbium-159. Also,the ability to irradiate targets at different protonbeam energies opens up the possibility of pro-ducing other radioisotopes. A proof-of-principletest was conducted to develop a 40-MeV tunein the 100-MeV beam line. Another parameterexplored was the beam current, which was raisedfrom the normal limit of 250 uA up to 356 uA viaboth power and repetition rate increase. Thisproof-of-principle test demonstrated the capa-bility of the IPF beam line for high current oper-ation with potential for higher isotope yields. Forthe full production mode, system upgrades willneed to be in place to operate at high current andhigh duty factor. These activities are expected toprovide the data needed for the development ofa new and unique isotope production capabilitycomplementing the existing 100-MeV IPF facility.

MOP062 Linac followed by an Electron Cooler toProvide a Short Bunch Proton BeamA. Noda (Kyoto ICR), H. Souda, H. Tongu (Ky-oto ICR) T. Fujimoto, S.I. Iwata, S. Shibuya(AEC) K. Noda, T. Shirai (NIRS)Proton beams accelerated by an RFQ and a DTLwith resonant frequency of 433 MHz,are electroncooled after injection into a storage ring, S-LSRand fast extracted to a beam irradiation target.Short pulse duration around 3.5 ns is expectedfor the 7 MeV proton beam with the intensity of1.4 x 108 [1]. This beam is to be utilized for irra-diation of biological cells in order to investigateRadio Biological Effectiveness of proton beamwith a very high peak intensity for the purpose ofquantitative verification of the recent report onthe DNA double strand breaking with the use ofshort-pulse laser-produced proton beam [2]

MOP064 R&D of C Band Accelerating Structure atSINAPW. Fang (SINAP), Q. Gu, Z.T. Zhao (SINAP)D.C. Tong (TUB)A compact hard X-ray FEL facility is on plan nowat Shanghai Institute of Applied Physics (SINAP).This facility will be located close to ShanghaiSynchrotron Radiation Facility(SSRF) which is a3rd generation light source in China, in order tocontrol the overall length less than 650m, thisfacility asks a compact linac with high gradientaccelerating structure. C-band (5712MHz) ac-



celerating structure is a compromised and goodoption for this compact facility. R&D of a C-band (5712MHz) high gradient traveling-waveaccelerating structure has been in progress atShanghai Institute of Applied Physics (SINAP).The structure is consisted of 53 regular disk-loaded cells and two waveguide couplers, and itslength is about one meter. This paper introducesthe study of the accelerating structure designmethod, its experimental model and the prelimi-nary results of the RF cold test of the model struc-ture.

MOP065 C-Band Magnetic Coupled AcceleratingStructure OptimizationS.V. Kutsaev (MEPhI), R.O. Bolgov, M. Gu-sarova, D.S. Kamenshikov, K.I. Nikolskiy,A.Yu. Smirnov, N.P. Sobenin, S.E. Toporkov(MEPhI)This paper presents the results of a research thatanalyzed the possibility of using a magnetic cou-pled disk-loaded structure (DLS-M) as an accel-erating structure. DLS-M seems to have decentadvantages comparing to the classical electricalcoupled structure (DLS). The electrodynamicsparameters of such a structure at various modesin C-band for a wide range of phase velocitiesas a function of aperture radii and coupling slotsizes are presented. Both forward and backwardtravelling wave regimes are considered. Theessential parameters are compared to those ofclassical DLS. The design of an input coupler tothe accelerator consisting of this type structurecells is also presented.

MOP066 Numerical Modeling of Arcs in AcceleratorsJ. Norem (ANL), Z. Insepov, Th. Proslier (ANL)D. Huang (IIT) S. Mahalingam, S.A. Veitzer(Tech-X)We are developing a model of arcing to explainbreakdown phenomena in high-gradient rf sys-tems used for particle accelerators. This modelassumes that arcs develop as a result of mechan-ical failure of the surface due to electric ten-sile stress, ionization of fragments by field emis-sion, and the development of a small, denseplasma that interacts with the surface primar-ily through self sputtering and terminates as aunipolar arc capable of producing field emitterswith high enhancement factors. We are model-ing these mechanisms using Molecular Dynam-ics (mechanical failure, Coulomb explosions, selfsputtering), Particle-In-Cell (PIC) codes (plasmaevolution), mesoscale surface thermodynamics(surface evolution), and finite element electro-



static modeling (field enhancements). We be-lieve this model may be more widely applicableand we are trying to constrain the physical mech-anisms using data from tokamak edge plasmas.

MOP067 First High Power Tests of CLIC PrototypeAccelerating Structures with HOM Waveg-uide DampingS. Doebert (CERN), A. Grudiev, G. Riddone,W. Wuensch, R. Zennaro (CERN) C. Adolph-sen, F. Wang, J.W. Wang (SLAC) T. Higo,S. Matsumoto, K. Yokoyama (KEK)Prototype accelerating structures for the Com-pact Linear Collider (CLIC) are being developedand high-power tested in a collaboration be-tween SLAC, KEK and CERN. Several undamped,low group-velocity and strongly tapered proto-types (of the so-called T18 design) have beenoperated above 100 MV/m average gradient ata very low breakdown rates. Recently two newstructures with the same iris apertures but nowincluding higher order mode damping waveg-uides in each cell (TD18 design) have been testedat SLAC and KEK. The damped versions could beprocessed to similar gradients but an increasedbreakdown rate was observed. The dampingwaveguides lead to a magnetic field enhance-ment in the outer diameter of the cells which re-sults in increased pulsed surface heating. Themaximum pulsed temperature rise is 80 deg atthe design gradient of 100 MV/m compared toonly 20 deg for the undamped version. The high-power tests of the two TD18 structures are ana-lyzed with special emphasis on the influence onbreakdown rate of the enhanced magnetic fieldand consequent increased pulsed surface tem-perature rise.

MOP068 Design of the CLIC Main Linac AcceleratingStructure for CLIC Conceptual Design Re-portA. Grudiev (CERN), W. Wuensch (CERN)The design of the CLIC main linac accelerat-ing structure has been refined based on an im-proved understanding of the high-gradient limitsgiven by rf breakdown and pulsed surface heat-ing. In addition, compact couplers have beendeveloped and HOM damping loads have beendesigned. The rf design has also been madeconsistent with details of the present manufac-turing procedure, based on bonded asymmetri-cal disks, and with requirements coming fromintegration of the accelerating structure in thetwo-beam module which includes all subsys-tems. This completion and refinement of the



structure design has been made to produce theself-consistent parameter set required for prepa-ration of the CLIC conceptual design report.

MOP069 Thermal Fatigue of Polycrystalline Copperin CLIC Accelerating Structures: SurfaceRoughening and Hardening as a Functionof Grain OrientationM. Aicheler (CERN)The accelerating structures of CLIC will be sub-mitted to 2 x 1010 thermal-mechanical fatiguecycles, arising from Radio Frequency (RF) in-duced eddy currents, causing local superficialcyclic heating. In order to assess the effects of su-perficial fatigue, high temperature annealed OFECopper samples were thermally fatigued with thehelp of pulsed laser irradiation. They underwentpostmortem Electron Backscattered Diffraction(EBSD) measurements andµhardness observa-tions. Previous work has confirmed that sur-face roughening depends on the orientation ofnear-surface grains*,**. It is clearly observedthat, through thermal cycling, the increase ofhardness of a crystallographic direction is re-lated to the amount of surface roughening in-duced by fatigue. Near-surface grains, oriented[1 0 0] with respect to the surface, exhibiting verylow surface roughening, show limited hardeningwhereas grains oriented in [1 1 0], exhibiting se-vere surface roughening, show the most severehardening. Consistently, surface roughening andhardening measured on [1 1 1] direction lie be-tween the values measured for the other direc-tions mentioned.

MOP070 Breakdown Studies for the CLIC Accelerat-ing StructuresS. Calatroni (CERN), A. Hansen, J.W. Kover-mann, M. Taborelli, H. Timko, W. Wuensch(CERN) A. Descoeudres (EPFL) F. Djurabekova,K. Nordlund (HIP)Optimizing the design and the manufacturing ofthe CLIC RF accelerating structures for achiev-ing the target value of breakdown rate at thenominal accelerating gradient of 100 MV/m re-quires a detailed understanding of all the stepsinvolved in the mechanism of breakdown. Theseinclude surface modification under RF fields,electron emission and neutral evaporation inthe vacuum, arc ignition and consequent sur-face modification due to plasma bombardment.Together with RF tests, several experiments areconducted in a simple DC test set-up instru-mented with electrical diagnostics and opticalspectroscopy. The results are used also for val-



idating simulations which are performed usinga wide range of numerical tools (MD coupled toelectrostatic codes, PIC plasma simulations) ableto include all the above phenomena. We presentan overview of the current status of the activityand the prospects for future activities.

MOP071 The Hot Prototype of the PI-Mode Struc-ture (PIMS) for Linac4F. Gerigk (CERN), P. Bourquin, A. Dallocchio,G. Favre, J.-M. Geisser, L. Gentini, M. Polini,D. Pugnat, B. Riffaud, T. Tardy, M. Vretenar,R. Wegner (CERN)The PIMS cavities for Linac4 are made of 7 cou-pled cells operating in pi-mode at 352 MHz fre-quency. The mechanical concept is derivedfrom the 5-cell cavities used in the LEP machine,whereas cell length and coupling are adapted forproton acceleration in the range from 50 to 160MeV. Linac4 will be the first machine to employthis type of cavities for low-beta protons. Duringthe first years of operation the PIMS will be usedat low duty cycle as part of the consolidated LHCproton injector complex. It is designed, however,to operate eventually in a high duty cycle (10%)proton injector, which could be used as protonfront-end for neutrino or RIB applications. Toprepare for the series construction of the 12 PIMSunits the first cavity (102 MeV beam energy) hasbeen designed and constructed at CERN, to beused as a hot prototype for RF tests and as a pre-series mechanical unit. In this paper we reporton some of the design features, the constructionexperience, and first measurements.

MOP072 Prototype X-band CLIC Crab Cavity forHigh Gradient TestingG. Burt (Cockcroft Institute, Lancaster Uni-versity), P.K. Ambattu, A.C. Dexter (CockcroftInstitute, Lancaster University) V.A. Dolga-shev (SLAC)The CLIC collider will require a crab cavity inorder to recover the luminosty lost from the fi-nite crossing angle. An X-band travelling wavedeflecting cavity is a proposed solution for CLIC.A prototpe cavity has been constructed at Shake-speare Precision Engineering, UK, in order toperform high gradient tests of the proposed cav-ity design. The cavity utilises a novel couplingscheme to ensure low fields on the coupler inorder to better study the breakdown in the maincells of the cavity.



MOP073 Numerical Validation of the CLIC/SwissFEL/FERMI Multi Purpose X BandStructureM.M. Dehler (PSI) A.E. Candel, L. Lee (SLAC)Currently an X-band traveling wave acceleratorstructure is fabricated in a collaboration betweenCERN, PSI and Sincrotrone Trieste (ST). PSI andST will use it in their respective FEL projects,CERN will test break down limits and rates forhigh gradients. A special feature of this structureare two integrated wake field monitors monitor-ing the beam to structure alignment. The designused an uncoupled model for the fundamentalmode, assuming the overall behavior to be thesuperposition of the individual components. Forthe wake field monitors, an equivalent circuitwas used. This approach has been proven toproduce valid structure designs. None the lessit cannot approach the quality of a numericalelectromagnetic simulation of the full structure,which is ideal for a validation capturing the dif-ferences between design models and the realcavity as e.g. internal reflections inside the struc-ture or higher order dispersive terms altering theresponse of the wake field monitor. Using SLAC’sfamily of massive parallel codes ACE-3P, first re-sults are presented for the fundamental modeand the first transverse mode. They are com-pared with earlier simulations using simplifiedmodels.

MOP074 High Power Evaluation of X-band HighPower LoadsS. Matsumoto (KEK), T. Higo (KEK) G. Rid-done, I. Syratchev (CERN)Several types of X-band high power loads devel-oped for several tens of MW range were designed,fabricated and used for high power tests at X-band facility of KEK. Some of them have beenused for many years and some show possible de-terioration of RF performance. Recently revised-design loads were made by CERN and the highpower evaluation was performed at KEK. In thispaper, the main requirements are recalled, to-gether with the design features. The high powertest results are analysed and presented.

MOP075 Breakdown Characteristics in DC Spark Ex-periments of Copper Focusing on Purityand HardnessK. Yokoyama (KEK), S. Fukuda, Y. Higashi,T. Higo, S. Matsumoto (KEK) P. Alknes (NU)G. Arnau-Izquierdo, S. Calatroni, R. Santi-ago Kern, W. Wuensch (CERN) C. Pasquino(Politecnico/Milano)



To investigate the breakdown characteristic re-lated to the differences in purity and hardness,four types of oxygen-free copper (OFC) materi-als, usual class 1 OFC with/without diamond fin-ish, 7-nine large-grain copper and 6-nine hot-isotropic-pressed copper, were tested with theDC spark test system at CERN. Measurements ofbeta, breakdown fields and breakdown probabil-ity are discussed followed by the surface inspec-tion mostly with SEM on the tested materials.

MOP076 An Experimental Investigation into CavityPulsed HeatingL. Laurent (SLAC), V.A. Dolgashev, S.G. Tan-tawi (SLAC)Cavity pulsed heating experiments have beenconducted at SLAC National Accelerator Labora-tory in collaboration with CERN and KEK. Theseexperiments were designed to gain a better un-derstanding on the impact of high power pulsedmagnetic fields on copper and copper alloys. Thecavity is a one port hemispherical cavity that op-erates in the TE013-like mode at 11.424 GHz.The test samples are mounted onto the end-cap of the cavity. By using the TE013 mode,pulsed heating information can be analyzed thatis based only on the impact of the peak mag-netic field which is much bigger in value on thetest sample than on any other place in the cav-ity. This work has shown that pulsed heatingsurface damage on copper and copper alloys isdependent on processing time, pulsed heatingtemperature, material hardness, and crystallo-graphic orientation and that initial stresses occuralong grain boundaries which can be followedby pitting or by transgranular microfractures thatpropagate and terminate on grain boundaries.The level of pulsed heating surface damage wasfound to be less on the smaller grain samples.This is likely due to grain boundaries limiting thepropagation of fatigue cracks.

MOP077 Design of Parallel RF Feed System forStanding-Wave Accelerator StructureJ. Neilson (SLAC), V.A. Dolgashev, S.G. Tan-tawi (SLAC)Typical surface damage in travelling wave accel-erator structures occurs on the high field regionof the iris. As the damage accumulates the cou-pling between cavities is affected resulting inchanges in the phase shift between cells. This is-sue can be reduced by use of SW cells that are fedin parallel. RF breakdown is contained to the cellwhere it originates and the available electromag-netic energy for a given gradient is minimized by



the parallel feed. Several schemes[1] have beenproposed for parallel fed SW structures. Someof the proposed designs fed several cells fromeach arm, which reduces the advantage of lo-calizing a RF breakdown to an individual cavity.In addition they use a standing wave in the feedarms which allows coupling between cells. Weare proposing a somewhat more complex ap-proach using a directional coupler on each celland serpentine waveguide connection betweencouplers. This design approach isolates the cellsand gives an individual rf feed to each cell result-ing in the maximum increase in the operationalrobustness of the accelerator structure.

MOP078 Back-to-Back Cavities for Very Low EnergyHigh Power Side Coupled LinacsF. Galluccio (INFN-Napoli), M.R. Masullo(INFN-Napoli) A. Renzi (Naples UniversityFederico II) V.G. Vaccaro (Naples UniversityFederico II and INFN)The design of BBAC (Back-to-Back Accelerat-ing Cavity) tiles has been shown to be suitablefor proton Side Coupled Linacs down to ener-gies as low as 24 MeV. In this paper it will beshown that this design can be extended withprofit down to 18 MeV, provided that in the pro-cess of optimization the standard quality indices,shunt impedance and energy gradient, are usedin combination with the temperature rise in thecavities. A particular attention should also be de-voted to the thermo-mechanical stress and straindue to the non-uniform temperature distribu-tion.

MOP079 Detailed Studies of Multipactor inDielectric-Loaded Accelerator StructuresO.V. Sinitsyn (UMD), T.M. Antonsen,G.S. Nusinovich (UMD)Multipactor (MP) is known as the avalanchegrowth of the number of secondary electronsemitted from a solid surface exposed to an rffield under vacuum conditions. MP may occurin various microwave and rf systems such as mi-crowave tubes, rf windows and launchers, accel-erating structures and rf satellite payloads. Thiswork is focused on the multipactor analysis indielectric-loaded accelerator (DLA) structures.It was initiated by the experimental and theo-retical studies of such structures jointly doneby Argonne National Laboratory and Naval Re-search Laboratory [1]. Our goal was to create aself-consistent non-stationary model of MP thatwould explain the experimental results and helpfinding conditions for MP suppression. We cre-



ated a 2D model whose description and someinitial simulation data were presented in Ref. 2.In this paper, we demonstrate new simulationresults and compare them with the experimentalones obtained during recent extensive studiesof DLA structures performed by Argonne Na-tional Laboratory, Naval Research Laboratory,SLAC National Accelerator Laboratory and Eu-clid TechLabs, LLC [3].

MOP080 The Magic Pentagon of Cavity DesignD.C. Plostinar (STFC/RAL/ASTeC)Normal conducting RF structures are good can-didates for beam acceleration in a pulsed pro-ton linac, up to an energy exceeding 100 MeV. Inthis paper we present a systematic study of tech-nological alternatives currently available world-wide. Furthermore, we propose a new methodof analysing normal conducting cavities, by sum-marising all the design and construction aspectsin five main categories: EM fields, mechanical,thermal, beam dynamics and vacuum. The inter-connections between these five groups draw theboundary conditions which dictate the optimumdesign and technology choices.

MOP081 RF Tuning and Conditioning of the CDSPITZ Booster CavityV.V. Paramonov (RAS/INR), A. Naboka (RAS/INR) K. Floettmann (DESY) L. Jachmann,W. Koehler, M. Krasilnikov, J. Meissner,J. Schultze, F. Stephan, R.W. Wenndorff (DESYZeuthen)The DESY PITZ booster cavity, based on the CutDisk Structure (CDS), is completed in construc-tion. The L-band normal conducting cavity isintended to operate with accelerating rate up to14 MV/m and RF pulse length up to 900 mks toincrease the electron bunch energy in the PITZfacility at 20 MeV. At present time the cavity isunder vacuum conditioning to reduce the out-gassing rate for operation in the facility withphoto cathodes. Cavity mounting and RF con-ditioning is scheduled to summer 2010. Theresults of RF tuning before and after cavity braz-ing, together with results of conditioning, will bepresented.

MOP082 Low Level Radiofrequency Developmentstoward a Fault Tolerant Linac Scheme foran Accelerator Driven SystemC. Joly (IPN), J.-L. Biarrotte, F.B. Bouly (IPN)An Accelerator Driven System (ADS) for trans-mutation of nuclear waste requires a high powerproton beam (several MWs) to reach the neces-



sary spallation efficiency. Due to the inducedthermal stress to the subcritical core, the high-power proton linac will have to fulfil stringentreliability requirements to minimise the numberof unwanted beam trips (> 1 sec.) per opera-tion cycle. In view of the construction of theMYRRHA ADS demonstrator, in Mol (Belgium),beam dynamic analyses were carried out to eval-uate the fault tolerant capability of the supercon-ducting linac, in the particular case of a radiofre-quency (RF) cavity failure. This analysis was cou-pled with simulations on the RF behaviour of 700MHz superconducting cavitiy as well as its tun-ing and feedback loop systems. Such consider-ations led to the development of a prototypicaldigital Low Level RF (LLRF) system to control thecavity phase and accelerating field, especially inthe case of fast cavity retuning for failure com-pensation. In this paper we summarize the workwhich has been performed so far toward the de-velopment of such a fault-tolerant RF linac.

MOP083 LLRF Design for the HINS-SRF Test Facilityat FermilabJ. Branlard (Fermilab)The High Intensity Neutrino Source (HINS) R&Dprogram requires super conducting single spokeresonators operating at 325 MHz. After cou-pler installation, these cavities are tested at theHINS-SRF facility at Fermilab. The LLRF require-ments for these tests include support for contin-uous wave and pulsed mode operations, with theability to track the resonance frequency of thetested cavity. Real-time measurement of the cav-ity loaded Q and Q0 are implemented using gra-dient decay techniques, allowing for Q0 versusEacc plots. A real time cavity simulator was alsodeveloped to test the LLRF system and verify itsfunctionality.

MOP084 A Vector Control and Data Acquisition Sys-tem for the Multi-cavity LLRF System forCryo-Module 1 at the ILCTA at FermilabP. Varghese (Fermilab), J. Branlard, B. Chase,E. Cullerton, P.W. Joireman, V. Tupikov (Fer-milab)A LLRF control and data acquisition system forthe 8-cavity Cryo-Module 1 at the ILCTA hasbeen implemented using three , 33-channel MFCboards in a VXI mainframe. One card each isdedicated for the cavity probes for vector con-trol , forward power and reverse power measure-ments. The system is scalable to 24 cavities ormore with the commissioning of Cryo-Modules2 and 3 without additional hardware. The sig-



nal processing and vector control of the cavi-ties is implemented in a FPGA and a high speeddata acquisition system with upto 100 channelsstores data in external SDRAM memory. The sys-tem supports both pulsed and CW modes witha pulse rate of 5Hz. Acquired data is transferredbetween pulses to auxiliary systems such as thepiezo controller through the slot0 controller. Thedesign of the system is described and the perfor-mance of the vector control system is evaluated.

MOP085 Resonance Control in SRF Cavities at FNALY.M. Pischalnikov (Fermilab), W. Schappert(Fermilab)An adaptive Least Squares algorithm to controlLorentz force detuning in SRF cavities has beendeveloped and tested in the HTS at FNAL. Dur-ing open-loop tests in the FNAL HTS, the algo-rithm was able to reduce LFD in a 9-cell 1.3 GHzelliptical cavity operating at 35 MV/m from 600Hz to less than 10 Hz during both the fill andthe flattop. The algorithm was also able to adaptto changes in the gradient of the cavity and tochanges in the pulse length.

MOP086 Stability Evaluation for Long FB Loop De-lay in the ACS Cavity Field Control for theJ-PARC Linac 400-MeV UpgradeT. Kobayashi (JAEA/J-PARC)For 400-MeV upgrade of the J-PARC Linac, ACS(Annular Coupled Structure) cavities, which aredriven by 972-MHz RF, will be installed. TheACS cavity has complicated structure. Its Q-valueis very low and the operation frequency is treetimes higher in comparison with that of the SDTLcavity. So the stabilizing control of the ACS ac-celerating field will be more difficult than present324-MHz RF system. Further more the choppedbeam loading compensation is required. Espe-cially, the debuncher will be located very far fromthe klystron, then the feedback loop delay willbe about 1.5 us. This presentation will show thesimulation results of the feedback control of theACS cavity field including long loop delay and theeffect of the chopped beam loading.

MOP087 Beam Test of Chopped Beam Loading Com-pensation for the J-PARC Linac 400-MeVUpgradeT. Kobayashi (JAEA/J-PARC) M. Ikegami(KEK) Y. Ito (JAEA)The function of the chopped beam loading com-pensation was implemented into the digitalfeedback/feed-forward control system of theJ-PARC Linac LLRF system to stabilize the ACS



cavity fields for the 400-MeV upgrade. The beamtest of the chopped beam loading compensationwas performed with the present 324-MHz cavitysysmte. Consequently the chopped beam load-ing was successfully compensated and that thissystem is valid.

MOP088 Spallation Neutron Source LLRF Tempera-ture Dependence and SolutionM.T. Crofford (ORNL), T.W. Hardek, S.W. Lee,M.F. Piller (ORNL) T.L. Davidson (ORNLRAD)The Spallation Neutron Source (SNS) has beenoperating since the first neutrons were producedon April 29, 2006. During the last several yearsthe beam energy has been methodically ramped-up and outlying issues solved to improve systemreliability. During the beam studies a tempera-ture dependence has been discovered with theLow-Level RF systems. The effect is small butreadily observable as increased beam losses. Thetemperature dependence has been studied bothin the accelerator and in the laboratory and thesensitive components identified. A prototypesolution that replaces the temperature depen-dent components of the Low-Level RF Systemhas been designed and is in initial testing. Pre-liminary results of the laboratory tests have beenencouraging. Accelerator tests are planned afterinstallation during the December 2010 mainte-nance cycle.

MOP089 Spallation Neutron Source High-PowerProtection Module Test StandS.W. Lee (ORNL RAD), J.A. Ball, T.L. David-son, S.L. Jones (ORNL RAD) M.T. Crofford,T.W. Hardek (ORNL)The Spallation Neutron Source (SNS) High-Power Protection Module (HPM) provided in-terlocks and fast shutdown for the RF systemto protect the accelerating structures and highpower RF (HPRF) Distribution System. The HPMhas required some functionality upgrades sincethe start of beam operations and an upgradeto the HPM test stand was required to supportthese added features. The HPM test stand cur-rently verifies functionality, RF channel calibra-tion, and measurement of the speed of shutdownto ensure the specifications are meet. The up-graded test stand was implemented in a singleFPGA to allow for future growth and flexibility.Work is currently progressing on automationof the test stand to better perform the requiredmodule calibration schedule.



MOP090 Design and Testing of the TRIUMF ISACIIHigh-B RF Control SystemM.P. Laverty (TRIUMF), K. Fong, R.E. Lax-dal, Q. Zheng (TRIUMF) G. Dennison (UBC& TRIUMF)The rf control system for the twenty 141 MHzTRIUMF quarter wave superconducting cavitiesis a hybrid analogue/digital design. It is basedin part on an earlier design developed for the106MHz 1/4 wave superconducting cavities ofthe ISACII linac. This design has undergone sev-eral iterations in the course of its development.In the current version, a value-engineering ap-proach was used to reduce the cost and simplifythe hardware. The result is a single C-size VXImodule that incorporates all the required low-level rf functions - amplitude/phase control, tun-ing control, and control of the rf coupler. Itaccomplishes these functions at a substantiallylower cost than the previous two-module solu-tion. It also includes support for field upgradeof the DSP/PLD hardware and firmware. Someearly test results of the system operating in thelinac are outlined, and conclusions are summa-rized.

MOP091 A Digital Low Level RF Control System forthe S-DALINACM. Konrad (TU Darmstadt), U. Bonnes,C. Burandt, R. Eichhorn, N. Pietralla (TUDarmstadt)The superconducting cavities of the S-DALINAChave a high loaded quality factor and are verysusceptible to microphonics. To stabilize the am-plitude and phase of the cavities’ fields an analogcontrol system has been used for 20 years. To im-prove the stability and the availability of the lowlevel RF control system it is currently replaced bya digital one. The 3 GHz signals coming from thecavities are converted down to the base band us-ing hardware I/Q demodulators. The base bandsignals are digitized by ADCs and fed into anFPGA. This FPGA contains a custom CPU whichexecutes the code implementing the control al-gorithm. The computed control signal is I/Qmodulated before it is send to the cavity again.The superconducting cavities are operated witha self-excited loop algorithm whereas a genera-tor driven algorithm is used for the low Q normalconducting bunching cavities. A 6 GHz RF boardallows the operation of a new 2f buncher. Param-eters can be adjusted via an EPICS IOC runningon a standard PC. All signals from the FPGA canbe monitored in realtime by the operator.



MOP092 LINAC Subsystems for Better Beam ControlG. Jug (I-Tech)Control of bunch arrival time, energy and tra-jectory of particle beams in linear acceleratorsis mandatory to reach performance goals and iscarried out using different sub-systems. For op-timal control and especially for accelerators aim-ing at the highest level of performance, for ex-ample FELs, these systems should be consideredas a whole and work together. At Instrumenta-tion Technologies such systems have been de-veloped and tested on the field. Precise con-trol of amplitude and phase of the acceleratingfelds is performed with the Libera LLRF, a digi-tal RF stabilization system that is couple to Lib-era SYNC a very low jiiter master oscillator dis-tribution system. The Libera Brilliance SinglePass system provides high resolution position in-formation that allows accurate control of trajec-tories through critical machine sections such asbunch compression modules and FEL modula-tors and radiators. These systems are describedin detail in the paper with examples from fieldmeasurements.

MOP093 Design of Low Level RF Control System forAcceleratorY.S. Lee (SKKU), J.-S. Chai (SKKU) K.-H. Park(PAL)The low level RF (LLRF) control system for PLSstorage ring is being upgraded to improve theperformance of the system. The LLRF controlsystem under development consists of FPGA,and high speed ADC and DAC as well as ana-log front-end devices which process the signalfrom cavity and to RF high power system. In ad-dition, it utilizes digital signal processing tech-nology based on FPGA. In order to optimize theaccelerating electric field in the cavity, it is re-quired to maintain field stability less than s1% inamplitude and 1o in phase. And the resonancecondition of the cavity should be monitored andcontrolled. The various digital signal processingtheories such as digital filters, Cordic, PI controlenable to meet these requirements and to con-trol the feedback signal less than a microsecond.The LLRF control system is also equipped withthe Ethernet by the cPCI. The preliminary designstudy and modeling on the LLRF control systemfor PLS storage ring will be described in this pa-per.



MOP094 Cavity Control AlgorithmsT. E. Plawski (JLAB), C. Hovater (JLAB)A digital low level radio frequency (RF) systemtypically incorporates either a heterodyne or di-rect sampling technique, followed by fast ADCs,then an FPGA, and finally a transmitting DAC.This universal platform opens up the possibili-ties for a variety of control algorithm implemen-tations. The foremost concern for an RF controlsystem is cavity field stability, and to meet the re-quired quality of regulation, the chosen controlsystem needs to have sufficient feedback gain.In this paper we will investigate the effective-ness of the regulation for three basic control sys-tem algorithms: I&Q (In-phase and Quadrature),Amplitude & Phase and digital SEL (Self Excit-ing Loop) along with the example of the JeffersonLab 12 GeV cavity field control system.

MOP095 Status of the CEBAF Energy Upgrade RFControl SystemC. Hovater (JLAB), T.L. Allison, R. Bachi-manchi, G.E. Lahti, J. Musson, T. E. Plawski,D.J. Seidman (JLAB)To support the CEBAF energy upgrade from 6GeV to 12 GeV, the RF control system is beingmodernized to control the high gradient high QLsuperconducting cavities. The new system in-corporates a heterodyne transceiver along withI&Q sampling to measure and control magni-tude and phase. A low-cost Altera FPGA is usedto digitally implement the cavity control algo-rithms. One of the features of the system is adigital self excited loop to track the cavity overlarge Lorentz detuning (800 Hz) during turn on.The system has successfully completed prelim-inary development and is now moving into theproduction stage of the project. This paper dis-cusses the design, modeling, testing and produc-tion of the new RF control system and associatedperipheral systems (cavity interlocks, and reso-nance control).

MOP096 Collimation in the SNS Linac and HEBTD. Jeon (ORNL), J. Galambos (ORNL) J. Tang,X. Zhang (IHEP Beijing)For the SNS linac, a pair of horizontal MEBT col-limators was proposed by [D. Jeon et al., Phys.Rev. ST Accel. Beams 5, 094201 (2002)] basedon the findings of the halo mechanism driven bya large ratio of x and y beam size in the MEBT.Recently MEBT collimators were installed andbeam operation proves MEBT collimation veryeffective in reducing beam loss throughout thelinac, HEBT and IDump. The HEBT collimation



system is a combination of stripping foil for H-

beam and collimators. A benchmarking studyof the HEBT collimator system was conductedwith beam experiment and multiparticle track-ing. We measured the efficiency of HEBT colli-mators using beam loss monitors and comparedwith the model. Experimental data and simula-tion showed reasonable agreement. We also ob-tained halo profile measurements using scrap-ers.

MOP097 Design of a High Energy Beam Stop for Spi-ral2E. Schibler (IN2P3 IPNL), J.-C. Ianigro(IN2P3 IPNL) L. Perrot (IPN) N. Redon(UCBL)The driver accelerator of the Spiral2 facility willdeliver deuteron (40MeV) and proton (33MeV)beams with current up to 5mA and heavy ion(14.5MeV/n) beams up to 1mA. At the very endof the LINAC, the main Beam Stop will have towithstand a peak power of 200kW for deuterons,with an associated power density from 120W/mm2 to more than 700W/mm2. These challeng-ing specifications impose the design of a newhigh efficiency Beam Stop that has been nick-named SAFARI (French acronym of OptimizedBeam Stop Device for High Intensity Beams).From the beam characteristics and activationconstraints, we proposed and developed a com-plete design. We will present this original de-sign and the different studies and optimizationswhich have been done: The Beam Stop shapemarries to the beam characteristics in order tosmooth for the best power density and improvethermo-mechanical behaviour under nominaland critical beams. Cooling system is directlymachined from Beam Stop blocks. Optimizationby various fluid studies and calculations led usto a new high efficiency counter-current watercooling system. We then compare calculated be-haviour with first results obtained on our recentfunctional mock-up

MOP098 Improvements in the Design of the Elec-trodes for the SPIRAL2 Single Bunch Selec-torP. Balleyguier (CEA) P. Bertrand, M. Di Gia-como (GANIL) F. Consoli (INFN/LNS)The high current driver accelerator of the SPIRAL2 project uses a single bunch selector to reducethe bunch repetition rate to the experimental tar-get. The device works at almost 1 MHz and han-dles fast RF pulses of 18 ns with transient timesshorter then 6 ns. The first electrode prototype,



built in the framework of the Eurisol DS project,didn’t show correct delay and matching. The pa-per describes the studies to improve these twoimportant issues.

MOP099 Status of the Design of 650 MHz EllipticalCavities for Project XS. Barbanotti (Fermilab), M.H. Foley,I.G. Gonin, J. Grimm, T.N. Khabiboulline,L. Ristori (Fermilab)Project X is a proposed high-intensity protonaccelerator complex that could provide beamto create a high-intensity neutrino beam, feedprotons to kaon- and muon-based precision ex-periments, and for other applications still underinvestigation. The present configuration of theproton accelerator foresees a section with 650MHz beta = 0.6 and beta = 0.9 elliptical cavities.Prototypes of single-cell 650 MHz cavities andfive-cell beta = 0.9 650 MHz cavities are beingdesigned and fabricated at Fermilab in the R&Dprocess for Project X. This paper summarizesthe design status of the beta = 0.6 and beta = 0.9single-cell prototype cavities, and also addressesthe design effort focused on the five-cell beta =0.9 cavities.

MOP100 Bunch Compressor for Intense ProtonBeamsL.P. Chau (IAP), M. Droba, O. Meusel, D. Noll,U. Ratzinger, C. Wiesner (IAP)The Frankfurt Neutron source FRANZ is underconstruction*. The ARMADILLO bunch com-pressor** as a part of it is composed of a 5MHzelectric kicker, a magnetic dipole chicane andrf-rebunching cavities. The design phase ofthe bunch compressor has reached the finalstage. A 175MHz 2MeV proton linac forms 100nslong beam pulses consisting of nineµbuncheswith 150mA. Deflected by the 5MHz kickertheµbunches are guided on different paths toarrive within 1ns at a n-production target. Dueto high space charge forces rebuncher cavitiesare included***. The peak current at the targetis expected to be in the range of 10A in a 1nsproton pulse, which is equivalent to a longitudi-nal pulse compression ratio of 45. A new codespecific for complex magnetic multi aperturesystem and for high current applications hasbeen developed. Hardware designs accordingto the beam dynamics results are in progress.Improved 3D magnetic and electric fields willbe applied in the future beam dynamics studiesincluding high space charge forces. The prelimi-nary designs and the beam dynamics studies will



be presented in this contribution.

MOP101 Rebuncher Cavities for the FRANZ BunchCompressorD. Noll (IAP), L.P. Chau, M. Droba, O. Meusel,H. Podlech, U. Ratzinger (IAP)The Frankfurt Neutron Source (FRANZ) currentlyunder construction at IAP (Goethe University ofFrankfurt) is designed to produce short neutronpulses at high intensity and repetition rates upto 250 kHz [*]. To achieve a bunch length ofone nanosecond despite the high space chargeforces, a bunch compressor of the Mobley type[**] using four dipole magnets and two rebunch-ers has been developed [***] to merge 9 linacbunches into the final focus. The first rebunchercavity, a λ/4 resonator operating at 87.5 MHz,has to feature nine beam paths due to the multi-trajectory system. Additionally the gaps have tobe displaced relatively to each other in a way thatall bunches arrive at the correct rf phase. Thesecond rebunching cavity will provide final fo-cusing as well as an energy variation of s0.2 MeVin front of the target and will be operating at 175MHz. This paper presents the design of thesenovel cavities as well as the simulated beam dy-namic properties.

MOP102 Space Charge Lens for Focusing Heavy IonBeamsK. Schulte (IAP), M. Droba, O. Meusel,U. Ratzinger (IAP)Space charge lenses use a confined electroncloud for the focusing of ion beams. Due tothe electric space charge field, focusing is inde-pendent of the particle mass. For this reason theapplication of the space charge lens especiallyin the field of heavy ion beams is advantageous.Moreover, the trapped non neutral plasma cloudcompensates the space charge forces of the ionbeam. The focusing strength is given by theconfined electron density whereas the densitydistribution influences the mapping quality ofthe space charge lens. An important parameterfor the focusing capability of the space chargelens is besides the homogeneous electron distri-bution a high electron density. In ongoing the-oretical and experimental work methods havebeen developed to determine the most impor-tant parameters like electron temperature andelectron density distribution for an optimizedlens design. Based on the experimental resultsa new space charge lens has been designed tofocus low energy heavy ion beams like 2,4 AkeVU4+ at the low energy transport section into the



GSI High Current Injector. Experimental resultswill be presented and compared with numericalsimulations.

MOP103 Studies on High Precision Machining ofCLIC RF StructuresJ. Huopana (HIP) G. Riddone (CERN)K. Österberg (Helsinki University, Depart-ment of Physics)The CLIC (Compact LInear Collider) is cur-rently under development at CERN as a po-tential multi-TeV e+e- collider. The manufac-turing and assembly tolerances for the requiredRF-components are important for the final effi-ciency and for the operation of CLIC. The properfunction of an accelerating structure is sensitiveto mechanical errors in shape and alignment ofthe accelerating cavity. The current tolerancesare in the micron range. This raises challengesin the field of mechanical design and manu-facturing and demands special manufacturingtechnologies and processes. Currently the me-chanical design of the accelerating structures isbased on a disk design. Alternatively, it is pos-sible to create the accelerating assembly fromquadrants, which has the potential to be favoredfor the mass production due to simplicity andcost. In this case, the functional shape insideof the accelerating structure remains the sameand a single assembly uses less parts. This paperconcentrates on the development work made forprototype accelerating structures and describesits application to series production.

MOP104 Studies on Thermo-mechanical Behaviorof the CLIC Two-beam ModuleR.J. Nousiainen (HIP), K. Osterberg (HIP)G. Riddone (CERN) A. Samoshkin (JINR)To fulfill the mechanical requirements set by theluminosity goals of the CLIC collider, currentlyunder study, the 2-m two-beam modules, theshortest repetitive elements in the main linac,have to be controlled at micrometer level. At thesame time these modules are exposed to variablehigh power dissipation while the accelerator isramped up to nominal power as well as when themode of CLIC operation is varied. This will re-sult into inevitable temperature excursions driv-ing mechanical distortions in and between dif-ferent module components. A FEM model is es-sential to estimate and simulate the fundamentalthermo-mechanical behavior of the CLIC two-beam module to facilitate its design and devel-opment. Firstly, the fundamental thermal envi-ronment is created for different RF components



of the module. Secondly, the first thermal andstructural contacts for adjacent components aswell as idealized kinematic coupling for the mainmodule components are introduced. Finally, thethermal and structural results for the studiedmodule configuration are presented showing thefundamental thermo-mechanical effects of pri-mary CLIC collider operation modes.

MOP105 Preparation of Adjustable Permanent Mag-net Quadrupole Lens for Beam Test at ATF2S. Ushijima (Kyoto ICR), H. Fujisawa,Y. Iwashita, H. Tongu (Kyoto ICR) M. Ma-suzawa, T. Tauchi (KEK)A permanent magnet quadrupole lens with con-tinuously adjustable strength originally designedby Gluckstern was fabricated for a final focus. Itconsists of five PMQ discs that rotate on theiraxis, where odd and even numbered discs rotateoppositely but with the same absolute angle. Bysetting their lengths appropriately, the couplingbetween x and y components can be minimized.In order to reduce multipole components higherthan quadrupole, we adjust positions of magnetwedge pairs. At the same time we improve dif-ferences between the magnetic center and themechanical center of the PMQ discs by measur-ing harmonics of fields in magnets. In order tocarry out the beam test, a high precision mov-able table for the lens system is also fabricated.This table can evacuate the lens system from thebeam line completely without vacuum breaking,which should ease the evaluation of the systemat decreased strength region.

MOP106 Implementation of Multilayered Conduc-tor Structures on RF Cavity SurfacesY. Iwashita (Kyoto ICR)Multilayered conductor structures on RF cavitysurfaces have been discussed these years. Al-though a real implementation was succeeded ona coaxial cavity at room temperature by measur-ing Q-value, it may not be a practical example.Application of the multilayered conductor struc-ture on superconducting cases came out recentlyand is studied by some groups. Possible thoughtson the further implementation at room temper-ature will be discussed including a considerationon the superconducting case.

MOP107 The Darht Axis II Beam Run Permit ControlSystemR.D. Archuleta (LANL)The Dual Axis Radiographic Hydrodynamic TestFacility (DARHT) is the world’s premier hydrotest



firing site. DARHT contains two linear acceler-ators for producing flash radiographs of hydro-dynamic experiments. The DARHT facility (bothAxis I and Axis II) have defined Modes of op-eration, based on the Personnel Safety Systemconfiguration. It is the philosophy of acceler-ator systems that configuration of the compo-nents required to deliver beam should not relyon human attention alone. The Axis II BeamRun Permit control system implements a seriesof hardware and software logic elements that de-fine and limit the Axis II states of operation andautomatically establish machine operating pa-rameters. Within each of the defined PersonnelSafety System Modes, DARHT Axis II operationrequires a number of different states and timingconfigurations. For each Beam Run Permit state,operations of Axis II requires different accelera-tor hardware configurations, interlocks, controlssettings, and timing scenarios. The DARHT AxisII Beam Run Permit control system has providedefficiency and achieved operational configura-tion of the Axis II accelerator to provide peak ra-diographic performance.

MOP108 Planned Machine Protection System for theFacility for Rare Isotope Beams at MichiganState UniversityS. Assadi (FRIB), M.J. Johnson, T.L. Mann,E. Pozdeyev, E. Tanke, X. Wu, R.C. York,Q. Zhao (FRIB) M. Doleans, F. Marti (NSCL)The Facility for Rare Isotope Beams (FRIB) atMichigan State University will utilize a 400 kW,heavy-ion linear accelerator to produce rare iso-topes in support of a rich program of fundamen-tal research. In the event of operating failures, itis extremely important to shut off the beam in aprompt manner to control the beam losses thatmay damage the accelerator components suchas superconducting cavities. FRIB has adaptedthe residual beam loss activation limit at 30 cm tobe equivalent to 1W/m of operating beam losses.We are designing FRIB MPS to be flexible but re-dundant in safety to accommodate both com-missioning and operations. It is also dependentupon the operational mode of the acceleratorand the beam dump in use. The operationalmode is distributed via a finite state machine toall critical devices that have multiple hardwarecheckpoints and comparators. It is important tonote that FRIB is a cw machine and MPS sta-tus is continuously being monitored by ’devicemode change’ and real time data link. In this pa-per, we present FRIB Machine Protection archi-tecture, plans and implementation.



MOP109 Electromagnetic Torque from Linac Radia-tionO. A. Konstantinova (Tomsk State Univer-sity)In this paper the new phenomenon of nature,called electromagnetic torque radiation from therelativistic charged particles is discussed. To be-gin it is shown that two well ’ known alternativedefinitions of density of angular momentum ofelectromagnetic field by Ivanenko-Sokolov* andby Teitelboim and Villarroel** give the identicalintegral characteristics with application of therelativistic radiation theory. And both of it yieldthe same results for the total power of the angularmomentum, which is characterized the torque ofthe radiation. Then we have found that the angu-lar distribution of torque from the Linac has theazimuthal symmetry with respect to the direc-tion of the velocity of the particle. It is also oppo-sitely directed to the acceleration of the particle.On the condition of the high speed the angulardistribution has an expressive relativistic effect ofthe sharp directed radiation. With the construc-tion of a good detectors of the torque it is possi-ble to measure such effect.

MOP110 High Gradient Wakefield Acceleration (∼GV/m) in Structures: Goals of the UpgradedArgonne Wakefield Accelerator Facility(AWA)M.E. Conde (ANL), W. Gai, R. Konecny,W. Liu, J.G. Power, Z.M. Yusof (ANL) S.P. An-tipov, C.-J. Jing (Euclid TechLabs, LLC)New technology needs to be developed for fu-ture compact linear colliders. The AWA Facilityis dedicated to the study of advanced acceleratorconcepts towards this goal. The facility uses highcharge short electron bunches to drive wake-fields in dielectric loaded structures as well as inmetallic structures (iris loaded, photonic bandgap, etc). Accelerating gradients as high as 100MV/m have been reached in dielectric loadedstructures, and RF pulses of up to 44 MW havebeen generated at 7.8 GHz. In order to reachhigher accelerating gradients, and also be ableto generate higher RF power levels, several facil-ity upgrades are underway: a new RF gun witha higher QE photocathode; a witness beam toprobe the wakefields; additional klystrons andlinac structures to bring the beam energy up to75 MeV. The drive beam will consist of bunchtrains of up to 32 bunches of 60 nC, correspond-ing to a beam power of 6 GW. The goal of futureexperiments is to reach accelerating gradients ofseveral hundred MV/m and to extract RF pulses



with GW power level. A key advantage of wake-field acceleration in structures is the ability to acton electrons and positrons in basically identicalfashion.

MOP111 High Brightness Electron Beam FocusingSystem for an X-ray GeneratorT. Sakai (KEK), M. Ikeda, S. Ohsawa, N. Sak-abe, T. Sugimura (KEK)A new type of rotating anticathode X-ray gen-erator has been developed, in which the elec-tron beam up to 120keV irradiates the inner sur-face of a U-shaped Cu anticathode. A high-fluxelectron beam is obtained by optimizing the ge-ometry of the combined function bending mag-net. In order to minimize the sizes of the X-ray source, the electron beam is focused in ashort distance by the combined function bend-ing magnet, of which geometrical shape was de-termined by simulation with the codes of Opera-3D, General Particle Tracer (GPT) and CST STU-DIO. The result of simulation clearly shows thatthe role of combined function in the bendingmagnet and the steering magnet is importantto focus the beam in small sizes. FWHM sizesof the beam were predicted by simulation to be0.45mm (horizontal) and 0.05mm (vertical) for abeam of 120keV and 75mA of which effective bril-liance is about 500kW/mm2 with the supposi-tion of a two-dimensional Gaussian distribution.The beam focus sizes on the target will be veri-fied in the experiments by using the high-voltagepower supply for the X-ray generator improvedfrom 60kV to 120kV and 75mA.

MOP112 Detailed Studies Regarding the New Injec-tion System at the LINAC I at ELSAF. Klarner (ELSA), O. Boldt, W. Hillert,N. Hofmann, D. Krönung (ELSA) S. Ader-hold (DESY)In order to enhance the operating capabilities ofthe Bonn University Accelerator Facility ELSA, anew injector is currently under commissioning.Its purpose is to allow a single pulse mode aswell as to increase the current of the unpolarizedbeam provided to the external hadron physicsexperiments. The injector will produce an up to2 µs long pulse of 500 mA beam current or a sin-gle electron bunch with 2 A pulse current. Designand optimization of the injector were performedwith Egun, PARMELA and numerical simula-tions based on the paraxial equation. A 1.5 nslong pulse is produced by a thermionic elec-tron gun with 90 kV anode-cathode voltage, thencompressed and pre-accelerated by a 500 MHz



RF cavity and a four-cell travelling wave buncher.After acceleration of the electrons up to 25 MeVin the main linac the natural broadening of theenergy distribution in the particle ensemble dueto the acceleration process will be reduced by anenergy compression system. Studies have beenconducted concerning the adaptation of the op-tical elements in the transfer beamline to thebooster synchrotron with respect to the new re-quirements of the injection into the synchrotronand its acceptance.

MOP113 Multipacting Simulation of the Demount-able Damped CavityT. Konomi (Sokendai) F. Furuta, K. Saito(KEK)We have designed Demountable Damped Cavity(DDC) as an ILC R&D. DDC has an axial symmet-ric structure, the coaxial waveguide HOM cou-pler and absorber at the end of beam pipe of SRFcavity. It is also demountable structure. Thesestructures are expected to bring better cavity per-formance. However, DDC have many parallelfaced surfaces and the multipacting might be aconcerned issue. We have simulated MP on theDDC with CST-Studio and found MP could benot serious issue. In this paper we will report thesimulation result in detail.

MOP114 Confirmation of Leak Tightness of the MoSealing in Superfluid HeliumK. Saito (KEK), F. Furuta (KEK) T. Konomi(Nagoya University)MO sealing developed by Prof. H. Matsumoto inKEK and his collaborator M. Ohotsuka has beensuccessfully applied to SRF cavities. Its leak ra-tio is smaller than 3·10-8 Pam3/s or much betterin the superfluid Helium, which is the allowedlevel to successfully measure the cavity perfor-mance for more than 3 hours at 2K. Tighteningtorque is 15Nm and the bolt material is SUS304(JIS). Titanium is usable as cavity flange mate-rial. Copper looks better than pure Aluminium asthe gasket material. We have observed an addi-tional residual surface resistance about 5nΩ Zeroimpedance characteristics of the MO sealing is aremained issue. In this paper we report the re-sults in detail.

MOP115 Conceptual Design of ILC CFS in Moun-tainous SiteM. Yoshioka (KEK)It was proposed to change from a 2-tunnelscheme in the ILC Reference Design Report toa single tunnel plan by the GDE, Global Design



Effort in order to reduce the construction cost.Two proposals of RF source have been presentedto realize this scheme. One is ’Klystron Clus-ter System’, which moves every RF source relatedcomponents from the underground tunnel to theabove ground buildings. This would require thatthe surface topology be rather flat. Another oneis the ’Distributed RF System’, which does notgreatly increase the above ground facilities, andinstead every accelerator components are putinto a single main tunnel. Instead of poweringwith large-scale klystrons, downsized modulesare distributed throughout. We propose to makea single accelerator tunnel for active acceleratorcomponents based on the latter RF system and asub-tunnel, in which cooling water piping is in-stalled. The sub-tunnel can also be used for theemergency escape, underground water drainage,maintenance work and etc. This scheme fits tothe Japanese mountainous site.




TU1 — Invited OralChair: S. Choroba (DESY)

TU10109:00

Overview of FELs under Construction In-cluding FELs at Fermi Elettra, SPRing8 andFrascati SPARCG. Penco (ELETTRA)This talk will report the present status of theworlwide FEL projects under construction in-cluding FELs at Fermi Elettra, SPRing8 and Fras-cati SPARC

TU10209:30

Overview of Proposals for Major FEL Facili-tiesH.-H. Braun (PSI)The X-ray FEL facilities in an advanced stage ofplanning worldwide can be grouped in two cat-egories. Those with normal conducting driverlinacs aiming to bring the XFEL technology, af-ter the impressive feasibility prove at LCLS, to re-gional user communities at affordable cost, andthose with superconducting driver linacs capa-ble to serve several photon hungry users simulta-neously. The talk will review the rationales, tech-nical choices and status of the main proposalsand discuss some key R&D issues.

TU10310:00

Worldwide ERL R&D Overview IncludingJLAMP, BNL, and Cornell ERLsG. Neil (JLAB)Energy Recovering Linacs have become an im-portant approach to providing high brightnesselectron beams for photon production, nuclearphysics research, and cooling ions. The technol-ogy takes advantage of the ability of supercon-ducting rf cavities to accelerate high average cur-rent beams with low losses. After the desired in-teraction the electrons can be decelerated to lowenergy so as to minimize the required rf powerand electrical draw. When this approach is cou-pled with advanced continuous wave injectors,very high power, ultra-short electron pulse trainsof high brightness can be achieved. This talkwill review the status of worldwide programs in-cluding the on-going BNL and Cornell efforts, theNovosibirsk Multipass ERL, ALICE at Daresbury,the KEK/JAEA ERL, and the Peking ERL amongothers. We will also touch on the prospects forproposed machines such as the JLAMP advancedERL FEL efforts at Jefferson Lab designed to pro-duce ultra-high brightness beams of photons inthe 10-100 nanometer soft X-ray region.



TU10410:30

RIBF and Other RIB FacilitiesN. Fukunishi (RIKEN Nishina Center)Medium-energy high-intensity heavy-ion beamshave been used for more than twenty years aspowerful tools to investigate physics of unstablenuclei far from stability, in which one of the ma-jor problems is to understand the element gene-sis in universe. Many facilities including CERN,GANIL, GSI, MSU and RIKEN have developedtheir facilities to obtain much higher-intensityunstable-nuclei beams. Within these facilities,RIKEN first finished construction and commis-sioning of a major upgrade plan of the existing fa-cility, RI Beam Factory, three years ago, in whichthe world-first superconducting ring cyclotronis pushing the limit of energy for heavy-ion cy-clotrons. On the other hand, the FAIR and theFRIB project chose different strategies to obtainhigh-intensity heavy-ion beams, the former usessynchrotron and the latter uses superconductinglinacs. The present competition with three dif-ferent approaches is interesting because it willmake clear that which kind of accelerator com-plex is most effective for medium-energy heavy-ion facilities. In this talk, we will present theachievements and future of RIBF under the com-parison with other powerful competitors.


TU2 — Invited OralChair: S. Henderson (ORNL)

TU20111:30

Status of J-PARC Linac Energy UpgradeH. Ao (JAEA/LINAC)The J-PARC (Japan Proton Accelerator ResearchComplex) accelerator comprises the 400-MeV in-jector linac (at present 181 MeV), the 3-GeVRapid-Cycling Synchrotron (RCS) and the 50-GeV Main Ring (MR). The 3-MeV RFQ, the 50-MeV DTL and the 181-MeV Separated-type DTLhave been operated in the linac for experimen-tal users. The 400-MeV energy upgrade of thelinac started from March 2009. The ACS (AnnularCoupled Structure) cavities, the RF sources, thebeam monitors and the utilities are in produc-tion. Although some components are preparedin the annual summer shutdown separately, theall cavities will be installed and commissionedfor 6 months from July 2012. In this paper, wepresent the current status and the preliminaryresults of the energy upgrade.



TU20211:50

The High Intensity Proton Linac for CSNSH.F. Ouyang (IHEP Beijing), S. Fu, J. Li,T.G. Xu, X. Yin (IHEP Beijing)Work on the Chinese Spallation Neutron Source(CSNS) has been progressing well, including suc-cessful prototyping of some of the key compo-nents of the facility. The source incorporates anH- linac, with an output energy upgradable from81 to 250 MeV. The status of the project will bedescribed.

TU20312:10

Plans for the ESS LinacS. Peggs (ESS-S)Following selection of Lund as the site for thelong-pulse ESS (European Spallation Source), ateam of accelerator and target experts has beenworking on an update of the 2003 ESS linac de-sign. Improvements to the 2003 design will besummarised, and the latest designs for the linacwill be presented.


TU3 — Invited OralChair: A. Schempp (IAP)

TU30113:40

RFQ for CW ApplicationsA. Pisent (INFN/LNL)CW RFQs requires solid design since they haveto deal with design challenges and technologicallimitations. This talk overviews the recent perfor-mances of some of the most powerful RFQ cav-ities. Development, industrialisation and com-missioning results of CW RFQ are describe anddiscussed, with recent update on two emblem-atic designs: IFMIF and TRASCO.

TU30214:00

Applications of Spoke CavitiesJ.R. Delayen (ODU)Review of the theory, design and applications ofSpoke cavities, with particular emphasis on SRFspoked cavities. Aspects of low level RF controlfor spoke cavities will also be presented.

TU30314:20

Status of the Cornell ERL Injector Cry-omoduleM. Liepe (CLASSE)The Cornell Energy Recovery Linac (ERL) Injec-tor cryomodule is part of a prototype electronbeam source to demonstrate production of CW1.3 GHz, 100 mA average current, 2 ps, 77 pCbunches with emittance of 1 mm-mrad. Aftera successful initial run of the cryomodule withbeam, an improvement program was initiated inthe Fall 2009. The goals of the reconfigurationwere to replace the RF absorbers in the beamline



HOM loads that were subject to static charging,re-process the SRF cavities that exhibited a lowQ that further decreased by 50% during the run,and improve diagnostic sensor accuracy withinthe cryomodule. The upgraded cryomodule wasre-commissioned in early 2010 with excellentperformance. Details of the investigation andremedies for HOM load charging, cavity Q re-covery, and module assembly logistics will bepresented along with the ERL Injector beam per-formance.

TU30414:40

High-Performance SC Cryomodule for CWIon AcceleratorsM.P. Kelly (ANL)Recent developments for cryomodules requiredfor various low- and medium beta- CW ion ac-celerator projects will be presented. Compar-isons of the designs, fabrication technology andassembly procedures of cryomodules will be dis-cussed. To date, development in this area hasbeen mostly for basic science applications, how-ever, there is also considerable interest in ionaccelerators for other applications such as na-tional defense, medicine and accelerator drivensystems. The outlook for and some developmentrequirements of SRF cryomodules for these ap-plications will be discussed.


TU4 — Contributed OralChair: Y.-S. Cho (KAERI)

14-Sep-10 16:00–18:00 Poster Rooms 101, 102, 201TUP — Poster

TUP001 Conceptual Design of a C-band Accelerat-ing Module for Swiss FELR. Zennaro (PSI), M. Bopp, H.-H. Braun,A. Citterio, H. Fitze, M. Pedrozzi, J.-Y. Raguin(PSI)The Swiss FEL accelerator concept consists of a450 MeV S-band injector linac followed by themain linac at the American C-band frequencyaiming at a final energy of 5.8 GeV. The main linacis composed of 26 RF modules each consisting ofa single 50 MW klystron and its solid-state modu-lator feeding a pulse compressor and four accel-erating structures. The two-meter long C-bandaccelerating structures have 110 cells, includingthe two coupler cells and operate with a 2π/3phase advance. We report here on RF studies per-formed on the accelerating structures with differ-ent cell topologies and on the pulse compressorwhere two types are considered: a conventional



SLED-type and a Barrel-Open Cavity (BOC). Theenergy gain per accelerating structures and thepower requirements for the different accelerat-ing structures and the two types of pulse com-pressor with the single- and two-bunch opera-tion modes are presented as well.

TUP002 FERMI@Elettra: Installation and Commis-sioning of the S-Band RF SystemA. Fabris (ELETTRA), P. Craievich, P. Del-giusto, F. Gelmetti, M.M. Milloch, A. Milocco,F. Pribaz, A. Rohlev, C. Serpico, N. Sodomaco,R. Umer, L. Veljak, D. Wang (ELETTRA)FERMI@Elettra is a single-pass FEL user-facilitycovering the wavelength range from 100 nm (12eV) to 4 nm (310 eV) and is located next tothe third-generation synchrotron radiation facil-ity Elettra in Trieste, Italy. The first electronbeam from the photocathode electron rf gun andinjector system was extracted in August 2009.Commissioning and installation of the remain-ing linac and linac systems are continuing andwill alternate through this year . The linac isbased on normal conducting S-band technology.It uses fifteen 3 GHz 45 MW peak RF power plantspowering the gun, the accelerating structures,and the RF deflectors, and when completed willbe able to deliver greater than 1.5 GeV electronbeams to the FEL undulator system. This pa-per provides a summary of the installation activ-ities and discusses the performances results ofthe main subassemblies both during the initialcheckouts and through the commissioning of theaccelerator.

TUP004 Status of ERL and cERL Projects in JapanS. Sakanaka (KEK), H. Kawata, Y. Kobayashi(KEK) R. Hajima (JAEA/ERL) N. Nakamura(ISSP/SRL)Future light sources based on the Energy Recov-ery Linac (ERL) are expected to bring innova-tion to the synchrotron radiation (SR) science.Our Japanese collaboration team plans to con-struct a 5-GeV ERL which can produce super-brilliant and ultra-short pulses of SR as well ascan be a driver for a proposed X-ray free-electronlaser oscillator (X-FELO). In order to establish thekey technologies for the ERL, we are conduct-ing aggressive R&D efforts. Concerning our high-brightness photocathode DC electron gun, wesucceeded to apply a DC high voltage of 500 kVthrough a support rod. Both cryomodules for theinjector and the main-linac are also under devel-opment. In order to demonstrate reliable opera-tions of such key technologies, we plan to con-



struct the Compact ERL (cERL) at KEK. DuringFY2009, we prepared the infrastructure for thecERL which includes renovation of the building(the East Counter Hall), renovation of cooling-water system and electrical substation, installa-tion of liquid helium refrigerator, and installationof a part of the rf source. In this paper, we presentup-to-date status of the ERL and the CompactERL projects in Japan.

TUP005 Status of Development of the cERL Super-conducting Injector LinacK. Watanabe (KEK), E. Kako, S. Noguchi,M. Satoh, T. Shishido, Y. Yamamoto (KEK)Development of the superconducting injectorLinac for compact ERL has been continuing atKEK. The cryomodule including three two-cellSC cavities was designed. Two prot-type two-cell cavities were fabricated, and the vertivaltest were carried out after the standard surfacepreparation at STF. The high power tests of theinput couplers were also carried out at the teststand with 300 kW cw klystron. The status of thecERL injector cryomodue will be reported.

TUP006 Development of a Main Linac Module forCompact ERL ProjectK. Umemori (KEK), T. Furuya, H. Sakai,T. Takahashi (KEK) M. Sawamura (JAEA/ERL) K. Shinoe (ISSP/SRL)A construction of the Compact ERL is planned inKEK, Japan. A demonstration of the performanceof the main linac super-conducting acceleratingsystem is one motivation of the project. We havebeen designing a cryo-module, which worksunder CW operation, and contains two 9-cellcavities, with input couplers, frequency tunersand HOM dampers. Most of these componentshave been specially developed for ERL opera-tion. Two proto-type of the 9-cell cavity wereconstructed. First one was vertically tested andsuffered from field emissions. Second one is nowwaiting a measurement. High power componenttests have been carried out for input coupler.At first, large temperature rise was observedat a ceramic window part due to unexpecteddipole resonance. After that, new version of win-dow was designed and successfully passed 20kWCW power with reflection. Proto-types of HOMdamper were also constructed. Cooling testshave been performed for them to verify coolingability against more than 100W heat load, undervacuum condition. A cryo-module will be com-pleted in 2012, and cooling tests and beam testswill follow.



TUP007 BERLinPro - An Accelerator Demonstra-tion Facility for ERL-based Light SourcesJ. Knobloch (Helmholtz-Zentrum Berlin fürMaterialien und Energie GmbH, Elektronen-Speicherring BESSY II), M. Abo-Bakr, W. An-ders, K.B. Buerkmann-Gehrlein, M. Gen-sch, S.C. Hessler, A. Jankowiak, T. Kamps,O. Kugeler, B.C. Kuske, P. Kuske, A.N. Mat-veenko, A. Meseck, R. Müller, A. Neu-mann, K. Ott, T. Quast (Helmholtz-ZentrumBerlin für Materialien und Energie GmbH,Elektronen-Speicherring BESSY II)Energy recovery linacs (ERLs) are proving to bea powerful option to provide very high currentbeams with exceptional beam parameters andthe flexibility to tailor these for many applica-tions, from next-generation light sources to elec-tron coolers. Helmholtz Zentrum Berlin (HZB) isfocusing on ERLs for future x-ray light sources.Although ERL facilities exist for the IR and THzrange, their moderate parameters (current, emit-tance, energy) are insufficient for future x-raysources. HZB is therefore proposing to developthe 100-MeV ERL facility BERLinPro for accel-erator studies and technology development todemonstrate the feasibility of an x-ray user fa-cility. This paper presents an overview of theproject and the key components of the facility.

TUP008 Design Concepts of the 6 GeV High Perfor-mance Compact SwissFEL LinacY. Kim (IUCF) H.-H. Braun, T. Garvey, M. Pe-drozzi, J.-Y. Raguin, V. Schlott (PSI)To generate coherent hard X-rays at 0.1 nm in theSwissFEL facility, ultra-high brightness electronbeams (slice normalized emittance < 0.43 um,rms slice energy spread < 350 keV, peak current> 2.7 kA, beam energy ∼ 6 GeV) should be sentto a 50 m long undulator. Specially, to reduce thebandwidth of XFEL photon beams, an ultra-flatenergy chirp of electron beams is required. Addi-tionally, to operate the XFEL facility stably, ultra-tight RF jitter tolerances are required. Generally,it is difficult to obtain such advanced propertieswith a short FEL driving linac. In this paper, wedescribe design concepts of the advanced 6 GeVSwissFEL linac to reduce the ultra-tight RF jittertolerances, and to get an ultra-flat energy chirpwith a 400 m long compact linac.



TUP009 First Commissioning Experience at theSwissFEL Injector Test FacilityT. Schietinger (PSI), M. Aiba, B. Beutner,M. Dach, A. Falone, R. Ganter, R. Ischebeck,F. Le Pimpec, N. Milas, G.L. Orlandi, M. Pe-drozzi, S. Reiche, C. Vicario (PSI)The Paul Scherrer Institute is commissioning a250 MeV injector test facility in preparation forthe SwissFEL project. Its primary purpose isthe demonstration of a high-brightness electronbeam meeting the specifications of the SwissFELmain linac. At the same time it is advancing thedevelopment and validation of the acceleratorcomponents needed for the realization of theSwissFEL facility. We report the results of thefirst commissioning phase, which includes thegun section of the injector up to 7 MeV elec-tron energy. Electrons are generated by a 2.6-celllaser-driven photocathode RF gun operating at3 GHz followed by an emittance compensatingfocusing solenoid. The diagnostic system for thisphase consists of a spectrometer dipole, a seriesof screens and beam position monitors and sev-eral charge measuring devices. Slit and pinholemasks can be inserted for phasespace scans andemittance measurements. The completion of theentire injector facility proceeds in three stages,culminating with the integration of the magneticcompression chicane expected for early 2011.

TUP010 Test Results of Components for CW andNear-CW Operation of a SuperconductingLinacJ.K. Sekutowicz (DESY)The European XFEL will use superconductingTESLA cavities operating with 650 µs long bunchtrains. With 220 ns bunch spacing and 10 HzRF-pulse repetition rate up to 27000 high qualitybunches/s will be delivered to insertion devicesgenerating unprecedented high average bril-liance photon beams at very short wavelength.While many experiments can take advantageof full bunch trains, others prefer an increasedseveral µ-seconds intra pulse distance betweenbunches, or short bursts with kHz repetition rate.With the nominal RF-pulse structure these fea-tures will lead to a substantially reduced numberof bunches per second and therefore to signifi-cantly lower average brilliance. We discuss herean R&D program aiming for a far future upgradeof the European XFEL; operation in the cw and/or near-cw mode. The program profits fromthe continuous improvement in performanceof TESLA cavities, which allows for longer RF-pulses in comparison with the current design.



We present test results of a SRF electron injectorand a new RF-power source, and some modifi-cation of the HOM damping scheme, which willavoid the necessity of re-assembly of the XFELaccelerator for the upgraded operations.

TUP011 Layout of the PITZ Transverse DeflectingSystem for Longitudinal Phase Space andSlice Emittance MeasurementsL.V. Kravchuk (RAS/INR), V.V. Paramonov(RAS/INR) A. Anisimov, M.V. Lalayan,A.Yu. Smirnov, N.P. Sobenin (MEPhI) D. Chu-ranov, E.V. Ivanov, S.V. Kutsaev, M. Urbant,A.A. Zavadtsev, D.A. Zavadtsev (Nano) A. Do-nat, W. Koehler, M. Krasilnikov, J. Meissner,M. Pohl, J. Schultze, F. Stephan, G. Trow-itzsch, R.W. Wenndorff (DESY Zeuthen)C. Gerth, M. Hoffmann, M. Huening, F. Lud-wig, H. Schlarb (DESY)Transverse Deflecting Systems are designatedfor longitudinal beam diagnostics of ultra-shortelectron bunches in modern FEL projects. At theEuropean XFEL, Transverse Deflecting Systemsare foreseen at three locations. A prototype ofthe TDS in the injector of the European XFEL willbe installed at PITZ which is identical in termsof deflecting structure, low-level RF system andpowerful RF hardware. This PITZ TDS has theaim to prove the required performance for allTDS subsystems as well as serve as a diagnosticstool for PITZ. Results of the test cells measure-ments of a S-band travelling wave structure arepresented, showing very good agreement withcalculated parameters. RF power supply system,including 3 MW klystron and other RF hardware,is described. Solid state 130 kV Marx modulatorhas been developed for the klystron feeding. 10kV module of the modulator has been built andtested. The modulator allows for high voltageshutdown within pulse.

TUP012 sFLASH - First Results of Direct Seeding atFLASHJ. Boedewadt (Uni HH), A. Azima, F. Curbis,H. Delsim-Hashemi, M. Drescher, E. Hass,U. Hipp, Th. Maltezopoulos, V. Miltchev,M. Mittenzwey, M. Rehders, J. Rossbach,J. Rönsch-Schulenburg, R. Tarkeshian,M. Wieland (Uni HH) S. Bajt, S. Düsterer,K. Honkavaara, T. Laarmann, H. Schlarb(DESY) R. Ischebeck (PSI) S. Khan (DELTA)The free-electron laser facility FLASH at DESY(Hamburg) was upgraded during a five-monthshutdown in winter 2009. Part of this upgradewas the installation of a direct seeding exper-



iment in the XUV spectral range. Beside allcomponents for transport and diagnostics ofthe photon beam in and out of the acceleratorenvironment, a new 10 m long variable-gap un-dulator was installed upstream of the existingFLASH undulator system. The seed pulses aregenerated within a noble-gas jet by focusing 40fs long Ti:Sa laser pulses into it resulting a combof higher harmonics. In the first phase of the ex-periment the 21st harmonic of the 800 nm drivelaser will be used to seed the FEL process. Thecommissioning of the experiment has started inApril and the first results are expected after theFLASH commissioning period mid of summer2010. The experimental setup and the commis-sioning procedures as well as first result will bepresented.

TUP013 Commissioning and Early Operating Expe-rience of the FLASH Third Harmonic RFSystemE.R. Harms (Fermilab), H.T. Edwards (Fermi-lab) M. Huening, E. Vogel (DESY)A Third Hamonic/3.9 GHz superconducting RFmodule was recently installed in the FLASH facil-ity at DESY. Ultra short bunches with high peakcurrent are required to efficiently create highbrilliance coherent light and these can be pro-duced by means of a 2-stage transverse mag-netic chicane bunch compression scheme cou-pled with off-crest acceleration. The long bunchtails and reduced peak current which result fromthe nonlinearities of the RF since wave can beeliminated by the addition of a 3rd harmonicRF system. Such a system can also allow forthe creation of uniform intensity bunches of ad-justable length necessary for seeded operation.We present here a summary of commissioningand early operating experience of the newly-installed device.

TUP014 Construction of Injector System for SPring-8 X-FELH. Hanaki (JASRI/SPring-8), T. Asaka, H. Ego,H. Kimura, T. Kobayashi, S. Suzuki, M. Ya-maga (JASRI/SPring-8) T. Fukui, T. Inagaki,N. Kumagai, Y. Otake, T. Shintake, K. Togawa(RIKEN/SPring-8)The injector of the 8 GeV linac generates an elec-tron beam of 1 nC, accelerates it up to 30 MeV,and compresses its bunch length down to 20ps. Even slight RF instability in its multi-stagebunching section fluctuates the bunch width andthe peak current of an electron beam and it ac-cordingly results in unstable laser oscillation in



the undulator section. The acceptable instabil-ities of the RF fields in the cavities, which per-mit 10% rms variation of the peak beam current,are only about 0.01% rms in amplitude and 120 fsrms in phase according to beam simulation. Thelong-term RF variations can be compensated byfeedback control of the RF amplitude and phase,the short-term or pulse-to-pulse variations, how-ever, have to be reduced as much as possibleby improving RF equipment such as amplifiers.Thus we have carefully designed and manufac-tured the RF cavities, amplifiers and control sys-tems, giving the highest priority to the stabiliza-tion of the short-term variations. Componentsof the injector will be completed by the end ofthe May 2010, and the injector will be perfectedin the summer 2010. We will present the perfor-mance of the completed devices in the confer-ence.

TUP015 A Compact X-band Linac for an X-ray FELC.D. Nantista (SLAC), C. Adolphsen,K.L.F. Bane, Z. Huang, Z. Li, F. Wang, F. Zhou(SLAC)With the growing demand for FEL light sources,cost issues are being revaluated. To make themachines more compact, higher-frequencyroom-temperature linacs are being considered,in particular, ones using C-band (5.7 GHz) rftechnology where 40 MV/m gradients are possi-ble. In this paper, we show that an X-band (11.4GHz) linac using the technology developed forNLC/GLC can provide an even lower cost solu-tion. In particular, stable operation is possibleat gradients of 100 MV/m for single bunch oper-ation, and 70 MV/m for multibunch operation.The concern of course is whether the strongerwakefields will lead to unacceptable emittancedilution. However, we show that the small emit-tances produced in a 250 MeV, low bunch charge,LCLS-like S-band injector and bunch compres-sor can be preserved in a multi-GeV X-band linacwith reasonable alignment tolerances.

TUP016 A Proposal for Increasing the Energy of theFERMI@Elettra LinacG. D’Auria (ELETTRA)FERMI@Elettra is a soft X-ray, fourth genera-tion light source facility under construction atthe Elettra Laboratory in Trieste, Italy. It willbe based on a seeded FEL, driven by the exist-ing normal conducting linac that is presently ex-pected to operate at 1.5 GeV. This will allow fora FEL operation down to 4 nm (FEL-2 operatingmodefundamental). A possible scenario is pre-



sented for increasing the linac energy up to 2.3-2.4 GeV using X-band technology currently un-der development at Elettra. This can extend theFERMI@Elettra capability, in term of wavelength,down to the water window and beyond (< 2 nm).

TUP017 The Resonant Method of Stabilization forPlane of Deflection in the Disk Loaded De-flecting StructuresV.V. Paramonov (RAS/INR), L.V. Kravchuk(RAS/INR)The hybrid HE11 mode in the cylindrical diskloaded deflectors is twice degenerated. To ensureoperational performance and stabilize the posi-tion for the plane of deflection, the dispersioncurve for modes with perpendicular field polar-ization must be shifted in frequency with respectto the curve for modes with operating polariza-tion. A lot of decisions, based on the deteriora-tion of the axial symmetry of the structure, areknown for this purpose. The resonant methodof stabilization is proposed. Resonant elements’ slots, coupled only with modes of perpendicu-lar polarization, are placed in the disks. Two cre-ated branches of dispersion curve for composedslot - structure modes are generated and placedsymmetrically with respect to the non perturbeddispersion curve for operating modes. In theplane stabilization it provides qualitative advan-tage with respect a simple frequency shift, be-cause cancels, in the first order, the influence ofmodes with perpendicular field polarization onthe plane of deflection. The criteria for the slotsdefinition are presented. The example of appli-cation for the traveling wave S-band deflector isdescribed as well.

TUP018 Development of High-average-currentElectron InjectorsD.C. Nguyen (LANL), H.L. Andrews,F.L. Krawczyk, N.A. Moody (LANL) J.W. Lewellen,S.P. Niles, B. Rusnak (NPS)Modern electron injectors consist of an RF struc-ture with a photocathode integrated into thefirst full-wave half-cell or quarter-wave full-cell. While the cathode gradients in pulsed,normal-conducting RF injectors exceed 100 MV/m, which lead to substantial dark currents, thoseof cw normal-conducting and superconductingRF injectors are typically 10-20 MV/m. Emit-tance compensation has been modeled for bothNCRF and SRF injectors to generate nC electronbunches with normalized rms emittance of ∼2mm-mrad. The use of solenoid and RF focusingin combination with relatively low cathode gra-



dients can mitigate the space-charge-inducedradial expansion in nC bunches, resulting in lowemittance and also low dark currents.

TUP019 Proton Linac for ADS Application in ChinaS. Fu (IHEP Beijing), S.X. Fang, J.Q. Wang(IHEP Beijing) X. Guan (CIAE)In the next two decades, China will be in pe-riod of fast development of nuclear power tomeet the energy demands of the rapid economygrowth and to cut down the CO2 release. Acceler-ator Driven System is recognized as the best op-tion for nuclear radioactive waste transmutation.ADS long-term development roadmap has beenproposed. Based on the ADS basic study in thelast decade, a samll-scale ADS facility is going tobe built to do experimental research on ADS sys-tem. In this paper, we will first review the previ-ous R&D activity on ADS linac research in China,and then introduce the design of the linac in thesmall-scale ADS facility.

TUP020 Accelerator Reference Design for theMYRRHA European ADS DemonstratorJ.-L. Biarrotte (IPN) H. Klein (IAP)A.C. Mueller (IN2P3) P. Pierini (INFN/LASA)D. Vandeplassche (SCK-CEN)The goal of the MYRRHA project is to demon-strate the technical feasibility of transmutationin an Accelerator Driven System (ADS) by build-ing a new flexible irradiation complex in Mol(Belgium). The MYRRHA facility requires a 600MeV accelerator delivering a maximum protonflux of 4 mA CW operation. Such a machine be-longs to the category of the high-power protonaccelerators, with an additional requirement forexceptional reliability: because of the inducedthermal stress to the subcritical core, the numberof unwanted beam interruptions should be min-imized down to the level of about 10 per 3-monthoperation cycle, a specification that is far aboveusual proton accelerators performance. Thispaper describes the reference solution adoptedfor such a machine, based on a so-called ’fault-tolerant’ linear superconducting accelerator, andpresents the status of the associated R&D.

TUP021 PEFP 100MeV Proton Accelerator Compo-nents Test by Using 20MeV LinacH.-J. Kwon (KAERI), Y.-S. Cho, J.-H. Jang,D.I. Kim, H.S. Kim, K.T. Seol, Y.-G. Song(KAERI)A 100MeV proton accelerator is developed by theProton Engineering Frontier Project (PEFP). As afront part, a 20MeV linac has been installed and



operated at Korea Atomic Energy Research Insti-tute (KAERI) site. Among the components for the100MeV accelerator, some parts were installedand tested by using 20MeV linac. One modula-tor for a 100MeV linac was installed to drive twoklystrons simultaneously which were used for a20MeV linac. Various operating parameters suchas a long term voltage fluctuation and controlperformance are checked during operation. Alsoa LLRF system for 100MeV linac which was mod-ified from the 20MeV system was installed andtested. In this paper, the operation characteris-tics of the 20MeV linac are presented especiallyfrom the viewpoint of the newly installed com-ponents such as a modulator and LLRF system.

TUP022 A Linac for Compact Pulsed Hadron SourceProject AT Tsinghua University BeijingX. Guan (TUB)This paper will be generally reported that a newproject of the Compact Pulsed Hadron Source(CPHS) led by the Department of EngineeringPhysics of Tsinghua University in Beijing, China.CPHS consists of a proton linac (13MeV, 16kW,Operating frequency 325MHz, peak current 50mA, 0.5 ms pulse width at 50 Hz), a neutron tar-get station (a Be target, moderators and reflec-tor), and a small-angle neutron scattering instru-ment, a neutron imaging/radiology station, anda proton irradiation station. The linac accelera-tor is the main part of this project, which includ-ing a ECR ion source. LEBT section, a RFQ ac-celerator, a DTL linac and a HEBT An An exper-imental platform for further proton applicationsand more neutron beam lines will be added at alater stage. Currently, fabrication of the accelera-tor components has begun while the neutron tar-get station, beam lines and instruments are un-der design study. The initial phase of the CPHSconstruction is scheduled to complete in the endof 2012.

TUP023 CH-cavity Development for the 17 MeV EU-ROTRANS InjectorF.D. Dziuba (IAP), M. Busch, H. Klein,H. Podlech, U. Ratzinger, C. Zhang (IAP)Recent international cw operated high-currentapplications with ambitious requirements re-garding beam power and quality ask for newlinear accelerator developments. In this contextthe CH-structure (Crossbar-H-mode) has beendeveloped at the Institute for Applied Physics(IAP) of Frankfurt University. It is a multi-celldrift tube cavity for the low and medium energyrange operated in the H21-mode and can be used



for superconducting as well as for room temper-ature operations. Because of the large energygain per cavity, which leads to high real estategradients, the CH-cavity is an excellent candi-date for the efficient acceleration in high powerproton and ion accelerators with fixed velocityprofiles. One possbile application for this kind ofcavity is the EUROpean research programme forthe TRANSmutation (EUROTRANS) of high levelnuclear waste in an accelerator driven system(ADS), which requires an efficient high-currentcw-linac (600 MeV, 4 mA, protons, 352 MHz).The paper describes the status of the CH-cavitydevelopment and the actual beam dynamicsresults for the reference design of the 17 MeVEUROTRANS injector.

TUP024 Status of the J-PARC LinacK. Hasegawa (JAEA/J-PARC)Beam commissioning of the J-PARC linac startedin November 2006 and 181 MeV acceleration wassuccessfully achieved in January 2007. The linachad delivered beams for commissioning of ac-celerators and experimental facilities. Trip ratesof the RFQ, however, unexpectedly increased inAutumn 2008, and that was the primary limita-tions of the operation days and power ramp up.We tried to recover by improvement of vacuumproperties, tender conditioning and so on. Bytaking these measures, we can lengthen the con-tinuous operation days and stand user opera-tions. We ramped up the beam power from 20kW to 120 kW for 3 GeV beam users in November2009. This corresponds to the linac beam powerof 7.2 kW and the linac has delivered beams atthis power since then without significant trou-bles. And also we successfully demonstrated 300kW at 3 GeV for 1 hour in December. We presentthe performance and operation experiences ofthe J-PARC linac.

TUP025 Operational Status and Life ExtensionPlans for the Los Alamos Neutron ScienceCenterK.W. Jones (LANL), J.L. Erickson, R.W. Gar-nett, M.S. Gulley (LANL)The Los Alamos Neutron Science Center (LAN-SCE) accelerator and beam delivery complexgenerates the proton beams that serve threeneutron production sources, a proton radiogra-phy facility and a medical and research isotopeproduction facility. The recent operating historyof the facility, including both achievements andchallenges, will be reviewed. Plans for perfor-mance improvement will be discussed, together



with the underlying drivers for the ongoing LAN-SCE Life Extension project. The details of thislatter project will also be discussed.

TUP026 Low and Medium Energy Beam TrasportUpgrade Results at BNL 200 MeV LinacD. Raparia (BNL), J.G. Alessi, B. Briscoe,J.M. Fite, O. Gould, V. LoDestro, M. Okamura,J. Ritter, A. Zelenski (BNL)BNL 200 MeV linac has been under operationsince 1970 and gone through several changesduring its 40 year lifetime. The latest reconfig-uration in low and medium energy (35 and 750keV) beam transport lines results in about a fac-tor of 2 reduction in the transverse emittance forthe accelerated polarized proton beam, and forthe unpolarized high current H- beam a severalfold reduction in the radiation levels due to beamlosses throughout the linac and isotope produc-tion facility complex with more beam current onthe isotope production target. These improve-ments are achieved by proper matching into thelinac in longitudinal as well as transverse phasespace. This paper will emphasize how longitu-dinal matching resulted in lower emittance andbeam losses.

TUP027 A New Medium Energy Beam TransportLine for the Proton Injector of AGS-RHICM. Okamura (BNL), B. Briscoe, J.M. Fite,V. LoDestro, D. Raparia, J. Ritter (BNL)N. Hayashizaki (RLNR)It is commonly preferred to have a short distancebetween an RFQ and a consequent DTL, howevermany devices has to be accommodated withina limited space. Our new medium energy beamtransport line for proton beam is categorized asone of the severest cases. High field gradientquadrupoles (65 Tm) and newly designed steer-ing magnets (6.5 mm in length) were fabricatedconsidering the cross-talk effects. Also a new halfwave length 200 MHz buncher is being studied.In the conference, the electro-magnetic field de-signs and the measured result will be discussed.

TUP028 Status of the FETS Commissioning andComparison with Particle Tracking ResultsJ.K. Pozimski (Imperial College of Scienceand Technology, Department of Physics),S.M.H. Alsari, S. Jolly, A. Kurup, D.A. Lee,P. Savage (Imperial College of Science andTechnology, Department of Physics) J.J. Back(University of Warwick) M.A. Clarke-Gayther,D.C. Faircloth, S.R. Lawrie, A.P. Letchford,M. Perkins, P. Wise (STFC/RAL/ISIS) C. Gabor,



D.C. Plostinar (STFC/RAL/ASTeC)In order to contribute to the development ofhigh power proton accelerators in the MW range,to prepare the way for an ISIS upgrade and tocontribute to the UK design effort on neutrinofactories, a front end test stand (FETS) is beingconstructed at the Rutherford Appleton Labora-tory (RAL) in the UK. The aim of the FETS is todemonstrate the production of a 60 mA, 2 ms,50 pps chopped beam at 3 MeV with sufficientbeam quality. The status of the FETS will be givenand experimental results from the commission-ing of LEBT and ion source will be presented.Previous measurements showed that the emit-tance of the beam delivered by the ion sourceexceeded our expectations by more than a factorof 3. Since then various changes in the beamextraction/post accelerator region reduced thebeam emittance more than a factor of 2. The re-sults from measurements will be compared withnumerical simulations of the particle dynamicsfrom the ion source to the end of the MEBT andthe results discussed in respect to further work.

TUP029 Continued Monitoring of the Conditioningof the Fermilab Linac 805 MHz CavitiesE.S.M. McCrory (Fermilab), F.G. Garcia,T.K. Kroc, A. Moretti, M. Popovic (Fermilab)We have been collecting data on the condition-ing of the high-gradient accelerating cavities inthe Fermilab 400 MeV H-Minus Linac for over16 years [1]. This linac was upgraded in 1989from a 201 MHz Alverez structure to include 805MHz side-coupled cavities. Automated measure-ments of the sparking rate have been recordedsince 1994 and are reported here. The sparkingrate has declined since the beginning, but thereare indications that this rate may have leveledoff now. The X-rays emitted by the cavities arecontinuing to decrease.

TUP031 A Side Coupled Proton Linac Module 30-35MeV: First Acceleration TestsV.G. Vaccaro (Naples University Federico IIand INFN) S. Barone (NRT) L. Calabretta,A. Rovelli (INFN/LNS) C. De Martinis (Univer-sita’ degli Studi di Milano & INFN) L. Gini,D. Giove (INFN/LASA) M.R. Masullo (INFN-Napoli) A.C. Rainò (Bari University, ScienceFaculty) V. Variale (INFN-Bari)ACLIP is a 3 GHz proton SCL linac designed as abooster for a 30 MeV commercial cyclotron. Thewhole accelerator is a 5 module structure cou-pled together. The final energy is 62 MeV wellsuitable for the therapy of ocular tumors. In or-



der to treat deep-seated tumors the energy canbe raised up to 230 MeV by adding a secondlinac. The possibility of using magnetrons, as thesource of RF power, to reduce the overall cost ofthe machine, and the tile design (covered by apatent), named Back-to-Back Accelerating Cav-ity (BBAC), to efficiently accelerate protons start-ing from a low energy are two of the more rel-evant features of this project. The first module(from 30 to 35 MeV) has been full power RF testedin December 2008, showing that the design ac-celerating field could be easily reached. Thenthis module, along with all elements of the RFpower setup, has been transferred to INFN-LNSin Catania at the end of April 2010 to carry outbeam acceleration tests using a 30 MeV protonbeam from the Superconducting Cyclotron. Inthis paper we will review the main features of thelinac and discuss the results of the accelerationmeasurements carried out on this prototype.

TUP032 A Versatile Neutron Generator for the Ac-celerator Driven System Experimental Pro-gram GUINEVEREM.A. Baylac (LPSC)GUINEVERE is a project devoted to experimen-tal studies of ADS feasibility and investigation ofthe on-line reactivity monitoring, sub-criticalitydetermination and operational procedures. Aversatile neutron source drives the sub-criticallead core VENUS-F located at SCK’CEN in Mol(Belgium). The GEnerator-of-NEutrons-Pulsed-and-Intense-3C is an electrostatic acceleratorgenerating 14 MeV neutrons by bombarding adeuteron beam on a tritium target located in thereactor core. A new accelerator was developed toproduce alternatively short (1 µs) and intense (40mA peak) deuteron pulses with adjustable repeti-tion rate, as well as continuous beam (1 mA DC).Moreover, a third mode provides programmableinterruptions on the DC beam to fulfill the re-quirements of the experimental program. Beamwill be inserted vertically into the reactor core.The accelerator is designed to enable the verti-cal section of the beam line to be easily cranedout the reactor bunker for maintenance oper-ations, target changes and core loading proce-dures. This paper describes the design of the ac-celerator and its commissioning. This work isperformed within the 6th Framework ProgramEC project EUROTRANS



TUP033 Commissioning of the IH Linac and HighEnergy Beam Transport of the EBIS BasedPreinjector for RHICD. Raparia (BNL), J.G. Alessi, E.N. Beebe,K. Kondo, R.F. Lambiase, V. LoDestro,R. Lockey, M. Mapes, A. McNerney, M. Oka-mura, D. Phillips, A.I. Pikin, J. Ritter,J. Scaduto, L. Smart, L. Snydstrup, M. Wil-inski, A. Zaltsman (BNL) R. M. Brodhage,U. Ratzinger, R. Tiede (IAP) T. Kanesue(Kyushu University)The EBIS based preinjector for RHIC is now beingcommissioned. The Linac was delivered in April2010 and commissioning started in May, 2010. Itaccelerates ions from 0.3 MeV/u to 2 MeV/u with27 accelerating gaps, one internal quadrupoletriplet, and operates at 100.625 MHz. The Linacis followed by a beam transport line to Boosterwhich includes seven quadrupoles, two bunch-ers, and an achromatic bend system with reso-lution of 500 at 2 MeV/u to select the requiredcharge state. Diagnostics include a pepperpotemittance probe, phase probes , fast Faradaycup, adjustable slits, three sets of multiwire pro-file monitors, three current transformers, twoFaraday cups, and two beam stops. This contri-bution will report results of linac tuning and coldmeasurements, and commissioning of the Linacand high energy transport line with helium andgold beams.

TUP034 Beam Commissioning Results for the RFQand MEBT of the EBIS Based Preinjector forRHICM. Okamura (BNL), J.G. Alessi, E.N. Beebe,K. Kondo, R.F. Lambiase, V. LoDestro,R. Lockey, M. Mapes, A. McNerney, D. Phillips,A.I. Pikin, D. Raparia, J. Ritter, L. Smart,L. Snydstrup, A. Zaltsman (BNL) T. Kane-sue (Kyushu University) A. Schempp,J.S. Schmidt, M. Vossberg (IAP) J. Tamura(Department of Energy Sciences, Tokyo Insti-tute of Technology)The EBIS based preinjector for the RHIC is nowbeing commissioned. During the step-wise com-missioning of the preinjector from January 2009to June 2010, the RFQ was commissioned firstusing Test EBIS in January 2009 and then movedto its final location and commissioned againwith RHIC EBIS in March 2010. The RFQ ac-celerates ions from 17 keV/u to 300 keV/u andoperates at 100.625 MHz. The RFQ is followedby a short (81 cm) Medium Energy Beam Trans-port (MEBT), which consists of four quadrupolesand one buncher cavity. Temporary diagnostics



for this commissioning included an emittanceprobe, TOF system, fast Faraday cup, and beamcurrent measurement units. This contributionwill report results of RFQ and MEBT commis-sioning with helium and gold beams.

TUP035 Design Study of C6+ Hybrid Single CavityLinac for Cancer TherapyL. Lu (RLNR), T. Hattori, N. Hayashizaki(RLNR)A new type Linac, HSC (hybrid single cav-ity) linac for cancer therapy, which configu-ration combines RFQ (Radio Frequency Qua-drupole) accelerating structure and DT (DriftTube) accelerating structure is being finisheddesigns and simulations now. This HSC linacdesign had adopted advanced power-efficiency-conformation, IH (Interdigital H) structure,which acceleration efficiency is extremely highin the low-middle energy region, and had alsoadopted most advanced computer simulationtechnology to evaluate cavity electromagneticdistribution. The study purposes of this HSClinac focus to design of injector linac for syn-chrotron of cancer radiotherapy facilities. Here,this HSC linac has an amazing space effect be-cause of compact size by coupled complex accel-eration electrode and integrated the peripheraldevice which is made operation easy to handle.The size of the HSC linac is very compact andis also easy to be adopted for cancer therapy innormal hospital.

TUP036 The RF System for the Compact PulseHadron SourceC. Cheng (TUB), T. Du, X. Guan, J. Wei,S.X. Zheng (TUB)The Compact Pulsed Hadron Source (CPHS) sys-tem has been proposed and designed by theDepartment of Engineering Physics of TsinghuaUniversity in Beijing, China. It consists of an ac-celerator front-end’a high-intensity ion source,a 3 MeV radiofrequency quadrupole linac (RFQ),and a 13 MeV drift-tube linac (DTL), a neutrontarget station, and some experimental stations.In our design, both RFQ and DTL share a sin-gle klystron which is capable of 2.5 MW peak RFpower and a 3.33% duty factor. The 325 MHzklystron contains a modulating anode and hasa 100 kW average output power. Portions of theRF system, such as pulsed high voltage powersource, modulator, crowbar protection and RFtransmission system are all presented in detailsin this paper.



TUP037 Design of Linear Injector for SSC of HIRFLY. He (IMP), X. Du, Z.J. Wang, J.W. Xia,C. Xiao, Y.Q. Yang, H.W. Zhao (IMP) J.E. Chen,Y.R. Lu, K. Zhu (PKU/IHIP)Heavy Ion Research Facility at Lanzhou (HIRFL)consists of two cyclotrons (SFC and SSC), onesynchrotron (CSRm), and one storage ring(CSRe). The two cyclotrons are in series as theinjector of the synchrotron. An additional LINACinjector for SSC is considered to increase thebeam time at targets. The new injector consistsof an RFQ and four IH-DTL tanks. A pre-buncherin the front of RFQ is 13 MHz to match the RFfrequency of SSC. The LINAC can operate in twomodes. In the first mode, the middle-mass ionsoutput with energy of 0.54 MeV/u, and then SSCaccelerates them up to the energy of 5.62 MeV/u.The beam is used to do the Super Heavy Ele-ments (SHE) experiments. In the second mode,the very heavy ions output with energy of 0.97MeV/u, and then SSC accelerates them up to en-ergy of 10.06 MeV/u. The beam is injected intoCSRm after stripped. Code LINREV and DAKOTAare used to design and optimize the accelera-tion structures of DTLs. The energy spread lessthan s0.5% and bunch length less than 2.6 ns areachieved at the exit of the last tank. These canmatch the ideal acceptance of SSC. A simulationfrom LEBT to exit of DTL is done by Beampath tobenchmark the design.

TUP038 Matter-Radiation Interactions in Extremes- The LANSCE FutureR.W. Garnett (LANL), M.S. Gulley (LANL)LANSCE has been the centerpiece of large-scalescience at Los Alamos National Laboratory formany decades. Recently, funding has been ob-tained to ensure continued reliable operation ofthe LANSCE linac and to allow planning to en-able the first in a new generation of scientific fa-cilities for the materials community. The em-phasis of this new facility is "Matter-RadiationInteractions in Extremes" (MaRIE) which will beused to discover and design the advanced ma-terials needed to meet 21st century national se-curity and energy security challenges. MaRIEwill provide the tools scientists need to developnext-generation materials that will perform pre-dictably and on-demand for currently unattain-able lifetimes in extreme environments. TheMaRIE facility is based on a high-power upgradeto the existing LANSCE proton linac, a new elec-tron linac and associated X-ray FEL to provideadditional probe beams, and new experimentalareas. A conceptual description of this new facil-



ity and its requirements will be presented.

TUP039 The New cw RFQ PrototypeU. Bartz (IAP), A. Schempp (IAP)Abstract A short RFQ prototype was built for testsof high power RFQ structures. We will studythermal effects and determine critical points ofthe design. HF-Simulations with CST MicrowaveStudio and measurements were done. The RF-Tests with continues power of 20 kW/m were fin-ished successfully. Simulations of thermal effectswith ALGOR are on focus now. First results andthe status of the project will be presented.

TUP040 Measurements at the MAFF IH-RFQ TestStand at the IAP FrankfurtJ.M. Maus (IAP), A. Schempp (IAP) A. Bech-told (NTG)The IH-type RFQ for the MAFF project at theLMU in Munich was operated at a beam teststand at the IAP in Frankfurt. It is the secondIH-RFQ after the HIS at GSI and it has been de-signed to accelerate rare isotope beams (RIBs)with mass to charge ratios A/q up to 6.3 from 3keV/u to 300 keV/u at an operating frequency of101.28 MHz with an electrode voltage of 60 kV.Experimental results such as shunt impedance,energy spectrum and transmission will be pre-sented.

TUP041 Upgrade for the HLI-RFQM. Vossberg (IAP), A. Schempp, C. Zhang(IAP) W.A. Barth, L.A. Dahl (GSI)A new CW-RFQ has been built for the upgradeof the HLI (High Charge State Injector) of GSIfor operating with a 28GHz-ECR-Ion source andsimultaneous increase of the beam duty cyclefrom 25 % now to 100 %. The new HLI 4-rodRFQ will accelerate charged ions from 4 keV/u to300 keV/u for the injection into the IH-structure.High beam transmission, a small energy spreadand small transverse emittance growth and goodinput matching are design goals. Properties ofthis CW-RFQ, status of project and first measure-ments will be presented.

TUP042 Progress in the Fabrication of the RFQ Ac-celerator for the CERN Linac4C. Rossi (CERN), P. Bourquin, J.-B. Lalle-ment, A.M. Lombardi, S.J. Mathot, D. Pug-nat, M.A. Timmins, G. Vandoni, M. Vretenar(CERN) M. Desmons, A. France, Y. Le Noa,J. Novo, O. Piquet (CEA)The construction of Linac4, the new 160 MeVCERN H- injector, has started with the goal ofimproving the LHC injection chain from 2015



with a new higher energy linac. The low energyfront end of Linac4 is based on a 352 MHz, 3-m long Radiofrequency Quadrupole (RFQ) accel-erator. The RFQ accelerates the 70 mA, 45 keVH- beam from the RF source to the energy of 3MeV. The fabrication of the RFQ has started atCERN in 2009 and is presently in progress, aim-ing at the completion of the full structure by early2011. The RFQ consists of three modules, onemeter each; the fabrication alternates machin-ing phases and stress relief cycles, for copper sta-bilization. Two brazing steps are required: oneto assemble the four parts composing a mod-ule and a second one to install the stainless steelflanges. In order to monitor that the tight me-chanical and alignment budget is not exceeded,metrology measurements at the CERN workshopand RF bead-pull measurements are performedduring the fabrication process. In this paperwe report results obtained during the machiningand the assembly of the first two modules of theLinac4 RFQ and data produced by RF measure-ments performed during their fabrication.

TUP043 Testing of IMP LIS-RFQY. Liu (IMP)A compact RFQ for carbon ion beam from aLaser-ion souce is being tested in IMP, Lanzhou.It is the first example of LINAC structures for IMP.Testing schemes and first results are presented.

TUP044 A Two-meter Long RFQ for the DirectPlasma Injection Scheme at IMPZ.L. Zhang (IMP), X.H. Guo, Y. He, Y. Liu,S. Sha, A. Shi, L.P. Sun, H.W. Zhao (IMP)R.A. Jameson, A. Schempp (IAP)A RFQ has been designed and built for researchof direct plasma injection scheme (DPIS), whichcan provide high current and highly chargedbeams. Because of the strong space charge forcesof beam from laser ion source, the beam dynam-ics design of the RFQ was carried out with a newcode LINACSrfq which can treat space chargeeffectively due to equipartitioning design strat-egy. Another feature of the RFQ is its high energygain in two-meter long which will be describedin detail. Construction of the RFQ cavity andthe 100MHz/250kW amplifier has been com-pleted and ready for test. A laser ion source isbeing tested. The assembling of the whole sys-tem including the ion source, the RFQ, the beamanalyzing and diagnostic system is being done.Preliminary test results will be presented.



TUP045 RF and Heat Flow Simulations of the SARAFRFQ 1.5 MeV/nucleon Proton/Deuteron Ac-celeratorJ. Rodnizki (Soreq NRC), Z. Horvitz (SoreqNRC)The SARAF 4-rod RFQ is operating at 176 MHz,designed to bunch and accelerate a 4 mA CWdeuteron/proton beam to 1.5 MeV/u. The elec-trodes voltage for accelerating deuterons is 65 kV,a field of 22 MV/m. The RFQ injected power isinduced by a loop coupler. The power needed toachieve this voltage is 250 kW, distributed alongthe 3.8 m RFQ length. This power density is ap-proximately 3 times larger than that achieved inother 4-rod RFQs. At high power, local high sur-face currents in the RFQ might cause overheat-ing which will lead to out-gassing and in turn tosparking. We used CST MWS to simulate the RFcurrents and fields in a 3D detailed model of theSARAF RFQ. The correct eigenmode was repro-duced and both Qe and Qo are consistent withthe measured values. The heat load generatedby the simulated surface currents at critical areasalong the RFQ was the input for thermal analysisusing Ansys. Detailed results reproduced the ex-perimental observation of several overheated re-gions in the RFQ, including the end flanges andthe plungers. Further results predicted overheat-ing at different regions which were subsequentlymeasured and are now being improved by addi-tional cooling.

TUP046 Development of the 3MeV RFQ for theCompact Pulsed Hadron Source at Ts-inghua UniversityQ.Z. Xing (TUB), Y.J. Bai, J.C. Cai, X. Guan,J. Wei, Z.F. Xiong (TUB) J.H. Billen, J. Stovall,L.M. Young (TechSource) W.Q. Guan, Y. He,J. Li (NUCTECH)We present, in this paper, the physics and me-chanical design of a Radio Frequency Quadru-pole (RFQ) accelerator for the Compact PulsedHadron Source (CPHS) at Tsinghua University.The 3-meter-long RFQ will accelerate protonsfrom 50 keV to 3 MeV at an RF frequency of325 MHz. In the physics design we have pro-grammed the inter-vane voltage as a function ofbeam velocity, to optimize the performance ofthe RFQ, by tailoring the cavity cross section andvane-tip geometry as a function of longitudinalposition while limiting the peak surface electricfield to 1.8 Kilpatrick. There will be no Medium-Energy-Beam-Transport (MEBT) following theRFQ. The focusing at the high energy end of theRFQ and at the entrance of the DTL have been



tailored to provide continuous restoring forcesindependent of the beam current. In simulationsof the proton beam in the RFQ, using the codePARMTEQM, we observe transmission exceed-ing 97%. The RFQ is mechanically separated intothree sections to facilitate machining and braz-ing. We have machined a test section and thefinal RFQ accelerator is now under construction.We will describe the status of the RFQ system inthis paper.

TUP047 Effects of Structural Perturbations on RFPerformance of RFQ StructuresK.R. Shin (ORNL), Y.W. Kang, S.-H. Kim,A.V. Vassioutchenko (ORNL) A.E. Fathy (Uni-versity of Tennessee)Radio-frequency quadrupole (RFQ) structuresare often treated to have ideal RF properties as ifthe mechanical design and fabrication are doneperfectly. If any part of the internal structure,especially the vanes become out of alignmentpossibly with certain mechanical stresses, theresonant frequency and the field distributionsmay change. The distorted structure could beretuned for the right resonant frequency andfield distributions usually with finite number ofmechanical tuners using measurements donewith finite number of field probes. The result ofpresent investigation shows that the disturbedlocal field distribution due to mechanical dis-tortion may be difficult to be restored by theretuning. Furthermore, the structures with con-ventional pi-mode suppressors using transversalshorting posts along the structure may distort H-field so that the usual field probe measurementsmay not be reliable for precision measurementsof the vane gap field distribution. This paperpresents the effects of vane tip misalignment, RFretuning, employing the dipole mode suppres-sors, and field measurements based on the 3-DRF simulations and some measurements.

TUP048 Experiences with the Fermilab HINS 325MHz RFQR.C. Webber (Fermilab)The Fermilab High Intensity Neutrino Source(HINS) program has commissioned a pulsed,325 MHz 2.5 MeV RFQ. The RFQ has success-fully accelerated a proton beam at the design RFpower. During RF conditioning, the resonantfrequency of the structure exhibited a fast, run-away, power-dependent detuning behavior. Thispaper describes observations, simulations, ulti-mate cause, and solution of the problem.



TUP049 Vane Machining by the Ball-end-mill forthe New RFQ in the J-PARC LinacT. Morishita (JAEA/J-PARC), K. Hasegawa,Y. Kondo (JAEA/J-PARC) H. Baba, Y. Hori,H. Kawamata, H. Matsumoto, F. Naito,M. Yoshioka (KEK)The J-PARC RFQ (length 3.1m, 4-vane type, 324MHz) accelerates a negative hydrogen beamfrom 0.05MeV to 3MeV toward the followingDTL. We started the preparation of a new RFQas a backup machine. The new cavity is dividedby three unit tanks in the longitudinal direction.The unit tank consists of two major vanes andtwo minor vanes. A numerical controlled ma-chining with a conventional ball-end-mill hasbeen chosen for the vane modulation cuttinginstead of the wheel shape cutter. In this presen-tation we will report the machining procedure,the results of the vane machining, RF properties,and some topics during the fabrication.

TUP050 Vacuum Brazing of the New RFQ for the J-PARC LinacT. Morishita (JAEA/J-PARC), K. Hasegawa,Y. Kondo (JAEA/J-PARC) H. Baba, Y. Hori,H. Kawamata, H. Matsumoto, F. Naito,M. Yoshioka (KEK)The J-PARC RFQ (length 3.1m, 4-vane type, 324MHz) accelerates a negative hydrogen beamfrom 0.05MeV to 3MeV toward the followingDTL. We started the preparation of a new RFQas a backup machine. The new cavity is dividedby three unit tanks in the longitudinal direction.The unit tank consists of two major vanes andtwo minor vanes. A one-step vacuum brazing ofa unit tank has been chosen to unite these fourvanes together with the flanges and ports. In thispresentation we will report the results of the vac-uum brazing with the dimension accuracy andan RF property.

TUP051 Longer Pulse Acceleration Using RFQ andLaser Ion SourceM. Okamura (BNL), K. Kondo (BNL) T. Kane-sue (Kyushu University, Department of Ap-plied Quantum Physics and Nuclear Engi-neering) H. Kashiwagi (JAEA/TARRI)It was proved that direct plasma InjectionScheme (DPIS) is an efficient way to acceler-ate high current highly charged state heavy ionbeam. More than 50 mA (peak current) of variousheavy ion beams were accelerated in BNL, RIKENand TITech. However, it was rather difficult toobtain longer pulse especially for highly chargedparticles. To induce highly charged states ions, a



high plasma temperature is required at the laserirradiation point and the high temperature au-tomatically gives a very fast expansion velocityof the plasma. This shortens the ion beam pulselength. To compensate the shorter ion pulselength, we can extend the plasma drift length,but it will dilute the brightness of the plasmasince the plasma expands three dimensionally.To avoid the reduction of the brightness, a simplelong solenoid was applied to confine the diverg-ing angle of the plasma. In the conference, thisnew technique will be explained and the latestresults will be shown.

TUP052 Preliminary Concept for the Project X CWRadio-frequency Quadrupole (RFQ)S.P. Virostek (LBNL), D. Li, J.W. Staples(LBNL)Project X is a proposed multi-MW proton facil-ity at Fermi National Accelerator Laboratory. Itis the key element for future accelerator com-plex development intended to support world-leading High Energy Physics (HEP) programs.The Project X front-end would consist of H- ionsource(s), a low-energy beam transport (LEBT),radio-frequency quadrupole (RFQ) accelera-tor(s), and a medium-energy beam transport(MEBT). To support current and future HEP ex-periments at Fermilab, a CW RFQ is required.One of the chosen RFQ designs has a resonantfrequency at 325 MHz. The RFQ provides bunch-ing of the 10 mA H- beam with acceleration upto 2.5 MeV and wall power losses of less than250 kW. LBNL is currently developing the earlydesigns for various components in the Project Xfront-end. The RFQ design concept and the pre-liminary RF and thermal analyses are presentedhere.

TUP053 Preliminary Design of a 70MHz RFQ for Ra-dio Isotope BeamsY.-S. Cho (KAERI), J.-H. Jang, H.S. Kim, H.-J. Kwon (KAERI)A Radio Frequency Quadrupole (RFQ) has beingdesinged for the post-acceleration of radio iso-tope beams from a radio isotope beam produc-tion system such as an isotpe separation on line(ISOL) or an in-flight separation. For simple andefficient beam acceleration, a chrage breedingsystem such as an electron cyclotron resonanceion source (ECRIS) or electron beam ion source(EBIS) The RFQ will operate at a resonant fre-quency of 70MHz at cw mode, and accelerate thebeams to 300keV/nucleon. In the conference wewill present the design of the RFQ.



TUP054 Latest Commisioning Results of theSiemens Particle Therapy* RFQS. Emhofer (Siemens Med), O. Chubarov,I. Hollenborg, C.M. Kleffner, V.L. Lazarev,M.T. Maier, H. Rohdjess, B. Schlitt, T. Sieber,B. Steiner, P. Urschütz (Siemens Med) H.K. An-dersen, T. Andersen, M. Budde, F. Bød-ker, J.S. Gretlund, H.B. Jeppesen, L. Kruse,C.V. Nielsen, C.G. Pedersen, Ka.T. Therkild-sen, S.V. Weber (Siemens DK)Siemens is currently preparing, installing andcommissioning three IONTRIS particle ther-apy accelerator systems - two in Germany, inMarburg and Kiel, and one in Shanghai, China.Siemens IONTRIS is based on a synchrotron toaccelerate protons and carbon ions for clinicalapplications up to 250 MeV resp. 430 MeV/u.The injector part consists of an RFQ to accelerateprotons and light ions up to 400 keV/u followedby an IH-cavity, wherein the particles achieve7 MeV/u. The results of the commissioning ofthe RFQ in the test facility in Denmark will bepresented.

TUP055 3D Aspects of the IFMIF-EVEDA RFQ:Design and Optimization of the VacuumGrids, of the Slug Tuners and of the EndCellA. Palmieri (INFN/LNL), F. Grespan, A. Pisent(INFN/LNL) F. Scantamburlo (INFN- Sez. diPadova)In order to attain the stringent goals that assurethe required performances of the IFMIF-EVEDARFQ in terms of field uniformity, Q-value andRF-induced heat removal capability, the study ofthe 3D details of the cavity is particularly impor-tant. In this paper the main issues regarding thedesign of the slug tuners, cavity ends and vac-uum grids are addressed, as well as the relatedoptimization procedure.

TUP057 Completion of the Fabrication of TRASCORFQE. Fagotti (INFN/LNL), M. Comunian,F. Grespan, A. Palmieri, A. Pisent, C. Ron-colato (INFN/LNL)Abstract The Legnaro National Laboratory (LNL)is building the 30 mA, 5 MeV front end injec-tor for the production of intense neutron fluxesfor interdisciplinary application. This injectorcomprises a proton source, a low energy beamtransport line (LEBT), a radio frequency quadru-pole (RFQ) and a beam transport line designedto provide a 150 kW beam to the beryllium targetused as neutron converter. The RFQ, developed



within TRASCO project for ADS application, isdesigned to operate CW at 352.2 MHz. The struc-ture is made of OFE copper and is fully brazed.The RFQ is built in 6 modules, each approxi-mately 1.2 meter long. This paper covers themechanical fabrication, the brazing results andthe low power tests for the whole structure.

TUP058 3D Thermo Mechanical Study on IFMIF-EVEDA RFQF. Scantamburlo (INFN- Sez. di Padova),A. Pepato (INFN- Sez. di Padova) M. Co-munian, E. Fagotti, F. Grespan, A. Palmieri,A. Pisent (INFN/LNL)In the framework of the IFMIF/EVEDA project,the RFQ is a 9.8 m long cavity, with very chal-lenging mechanicals specifications. In the baseline design, the accelerator tank is composed of18 modules that are flanged together. An RFQprototype, composed of 2 modules with a re-duced length, aimed at testing all the mechan-ical construction procedure is under construc-tion. In this paper, the thermo-mechanical studyby means of 2D thermo structural and 3D fluid-thermal-structural simulations will be described.The measurements made with a cooling watercircuit on a part of the RFQ prototype and thecomparison with fluid thermal simulation will bereported.

TUP059 Full 3D Modeling of a Radio-FrequencyQuadrupoleB. Mustapha (ANL), A. Kolomiets, P.N. Os-troumov (ANL)An integral part of the ongoing ATLAS efficiencyand intensity upgrade is an RFQ to replace thefirst section of the existing injector. The pro-posed RFQ is 3.8 m long made of 106 cells with30 keV/u input energy and 260 keV/u output en-ergy. The RFQ was designed using the DesRFQcode which produces a file consisting of thelength, modulation and the 8 coefficients of the8-term potential for every cell. To independentlycheck the design we created full 3D models of theRFQ including cell modulation in both Micro-Wave Studio (MWS) and Electro-Magnetic Stu-dio (EMS). The MWS model was used to verifythe phasing and energy gain along the RFQ us-ing particle tracking and the EMS model wasused to extract the electric field cell by cell as-suming the electrostatic approximation. A verygood agreement was obtained between the full3D model and the 8-term potential descriptionin TRACK. In addition to the standard sinusoidalvane profile we studied the option of converting



the cells with maximum modulation (∼ 40 cells)into trapezoidal cells. The output energy wasincreased from 260 keV/u to ∼ 300 keV/u withminimal change to beam dynamics. This optionis the final RFQ design.

TUP060 Possibility of Thermal Instability in 4-vaneRFQ Operation with High Heat LoadingV.V. Paramonov (RAS/INR)Due to dispersion properties 4-vane RFQ cavitywithout resonant coupling is a thermally unsta-ble structure. With deterioration of balance forlocal detuning there is a possibility for runawayin the field distribution and related thermal ef-fects. It can results, in principle, in irreversibleplastic deformations and cavity frequency shift.Both the increment and the threshold of insta-bility are proportional to the average dissipatedRF power. This possibility is more probable forlong RFQ cavities. Also particularities for the cav-ity ends design are important. Some general fea-tures of this effect are discussed qualitatively andillustrated with simulations.

TUP061 Development of a 324 MHz Drift Tube Linacfor CSNSX. Yin (IHEP Beijing)In the CSNS project, the 324HMz Alvarez-typeDrift Tube Linac (DTL) will be used to acceler-ate the H- ion beam from 3 to 80.77 MeV. TheR&D for the development of a prototype struc-ture for the energy range from 3 to 8.88 MeV istaking place at IHEP. The fabrication status ofthis 2.8 m Alvarez tank containing 28 drift tubesis introduced in this document. The fabricationand measurement results of the focusing qua-drupoles are also presented in this paper.

TUP062 Development of a Quadrupole Magnet forCSNS DTLX. Yin (IHEP Beijing)In the 324MHz CSNS Drift Tube Linac (DTL),the electromagnetic quadrupoles will be used fortransverse focusing. Since the higher operatingfrequency leads the size of the drift tube (DT)becoming smaller, the electromagnetic quadru-pole containing SAKAE coil has been applied us-ing the improved periodic reverse electroform-ing. The details of the design, the fabricationprocess, and the measurement results for thequadrupole magnet are presented in this paper.

TUP063 Design of a Drift Tube Linac for the CSNSProjectX. Yin (IHEP Beijing)In the China Spallation Neutron Source (CSNS)



project, the 324HMz Alvarez-type DTL will beused to accelerate the H- ion beam from 3 to80.77 MeV. A Four tank structure has been cho-sen. The Electromagnetic Quadrupole s(EMQ)will be used for the transverse focusing inside thedrift tubes. The DTL structure design parame-ters and the simulation of the EMQ are presentedin this paper. The design of the electrical field isalso described in this paper.

TUP064 The Optimization Design and ToleranceAnalysis of DTLZ.J. Wang (IMP), Y. He (IMP)The separated function DTL in SSC(SeparatedSector Cyclotron)-linac is being designed. Ac-cording to the design requirements, 238U34+ ionsare accelerated from 0.143MeV/u to 0.976MeV/u throught the DTL. The method couplingDAKOTA(Design Analysis Kit for Optimizationand Terascale Application) and beam simulationcode BEAMPATH is used to analyze tolerance ofthe structure. The tolerance of beam parametersto various type of random errors and misalign-ment are studied with Monte Carlo simulation,soas to define the engineering tolerance and align-ment. In this paper, the beam dynamics simula-tion and the tolerance analysis of the SSC-linacare presented.

TUP065 Concept Design of CW SC Proton LinacBased on Spoke Cavity for China ADSZ. Li (Southwest University of Science andTechnology)A 10mA CW proton linear accelerator, whichcomprise an ECR proton source, a 352.2MHzRFQ with output energy of 3.5-5MeV still to beoptimized, and a sequence of superconductingcavities of 352.2MHz and 704.4MHz to acceler-ate the proton up to 800MeV was proposed as theaccelerator driver for the China ADS project. Thespoke cavity with beta=0.12-0.4 were optimizedto accelerate proton up to 100MeV from the RFQoutput energy, the focusing lattice based on theoptimized results are proposed and the funda-mental beam dynamic study were presented.

TUP066 Production Design of the Drift Tube Linacfor the CERN Linac4S. Ramberger (CERN), G. De Michele,F. Gerigk, J.-M. Giguet, J.-B. Lallement,A.M. Lombardi, E. Sargsyan, M. Vretenar(CERN)The design of the Drift Tube Linac (DTL) forthe new linear accelerator Linac4 at CERN hasbeen made ready for production: H–ion beams



of up to 40 mA average pulse current are to beaccelerated from 3 to 50 MeV by three RF tanksoperating at 352.2 MHz and at duty cycles ofup to 10%. In order to provide a margin forlongitudinal matching from the chopper line,the longitudinal acceptance has been increased.The synchronous phase starts at -35o in tank1and ramps linearly to -24o over the tank whileit went from -30o to -20o in the previous design.The accelerating gradient has been lowered to3.1 MV/m in Tank1 and increased to 3.3 MV/m in Tank2 and Tank3 for a better distributionof RF power between tanks that is compatiblewith a mechanical design. To make the trans-verse acceptance less sensitive to alignment andgradient errors, the focusing scheme has beenchanged to FFDD over all 3 tanks. Design fea-tures that were demonstrated in earlier reportshave been improved for series production. Re-sults of high power RF tests of the DTL prototypeequipped with PMQs are reported that test thevoltage holding in the first gaps in presence ofmagnetic fields.

TUP067 Reduction of Transverse Emittance Growthin J-PARC DTLH. Sako (JAEA/J-PARC), M. Ikegami,A. Miura, G.H. Wei (JAEA/J-PARC)Transverse emittance growth was observed inJ-PARC Drift Tube Linac (DTL). In order to sup-press the growth, we searched for optimum pa-rameters at MEBT1, by measuring transverseemittance using four wire scanner monitors atthe exit of DTL. At 15 mA peak beam current inDec 2009, horizontal and vertical rms emittancewas reduced by 12 % and 10 %, respectively, bysetting the amplitudes of the first and secondbunchers to 120 % and 90 % with respect tothe designed settings. The resulting normalizedhorizontal and vertical emittance was 0.230 and0.205 pi mm mrad. At 20 mA in Jan 2010, hori-zontal and vertical rms emittance was reducedby 17 % and 10 %, respectively, by setting the am-plitudes of the first and second bunchers to 110% and 80 % with respect to the designed settings.The resulting normalized horizontal and verti-cal emittance was 0.273 and 0.253 pi mm mrad.At 15 mA, we further reduced the horizontal andvertical emittance to 0.171 and 0.200 pi mm mradby increasing the eighth quadruple magnet fieldat MEBT1 by 20 % to the designed value. Themeasured transverse emittance dependence onbuncher electric field and quadruple magneticfield will be compared with simulation.



TUP068 Operation Experiences of the DTL/SDTLfor the J-PARCT. Ito (JAEA/LINAC) K. Nanmo (KEK)The operation of the DTL and the Separated typeDTL (SDTL) of the J-PARC started in November2006. The DTL and SDTL are currently runningstable and accelerating the beam. For stable op-eration of the DTL/SDTL, We have done main-tenance of the equipments, like an RF coupler,and improved the troubles. In this paper, wewill present the operation experiences of the DTLand the SDTL.

TUP069 Radiation from the SDTL of J-PARCF. Naito (KEK), K. Nanmo, H. Tanaka (KEK)H. Asano, T. Ito (JAEA/J-PARC)X-ray radiation from the SDTL of J-PARC linachas been observed with the beam loss monitorby the cavity. The results show that the X-ray in-tensity depends not only on the RF power level ofthe tank but also on the RF structure of the tank.In the paper we will show the results of the inves-tigation for the origin of the X-ray radiation fromthe tank.

TUP070 RF-design and Construction of New LinacInjector for the RIKEN RI-Beam FactoryK. Yamada (RIKEN Nishina Center), S. Arai,Y. Chiba, H. Fujisawa, E. Ikezawa, O. Kami-gaito, M. Kase, N. Sakamoto, K. Suda,Y. Watanabe (RIKEN Nishina Center)Y. Touchi (SHI)A new linac injector, which will be exclusivelyused for the RIKEN RI-Beam Factory, has beenconstructed to increase the beam intensity ofvery heavy ions such as xenon and uranium.The injector system consists of a supercon-ducting ECR ion source, RFQ linac, three DTLs,and beam transport system including strongquarupole magnets and beam bunchers. TwoDTL resonators were newly designed while ex-isting devices including the RFQ* were modifiedto the other resonators. Direct coupling schemewas adopted for the rf-sytems of the DTLs, wherethe design study was successfully perfomed byusing the MWS code. This paper focuses on thedesign procedure of the DTLs and RFQ as well asthe results of their low and high power tests.

TUP071 Research on Drift Tube Linac Model Cavityfor CPHSS.X. Zheng (TUB), X. Guan, J. Wei, H.Y. Zhang(TUB) J.H. Billen, L.M. Young (TechSource)J. Stovall (CERN) Y.L. Zhao (IHEP Beijing)The CPHS project in Tsinghua University plans



to construct a 13 MeV linear accelerator to de-liver a pulsed proton beam having an averagebeam current of 2.5 mA. A Drift Tube Linac(DTL), following a Radio Frequency Quadru-pole accelerator(RFQ), will accelerate protonsfrom 3 to 13MeV. The accelerating field andphase will be ramped to match the longitudi-nal restoring forces at the end of the RFQ. Like-wise, the transverse focusing forces, provided bypermanent-magnet quadrupole lenses (PMQs)will be programmed to match the transverserestoring forces at the end of the RFQ to avoidmissmatch and avoid parametric resonances.We will present the main physics design param-eters of CPHS DTL and describe the propertiesof the resonant cavity. We plan to apply electronbeam welding technology exclusively in the fab-rication of the drift tubes and will present thetest results from our engineering prototypingprogram.

TUP072 An Equivalent Circuit for Post Coupler Sta-bilization in a Drift Tube LinacF. Grespan (INFN/LNL) G. De Michele,S. Ramberger, M. Vretenar (CERN)Post Couplers (PC’s) are devices used in order toreduce the effect of perturbations on the operat-ing mode of a DTL, using the resonant couplingstabilization method. In this article an equiva-lent circuit for a DTL equipped with PC’s is pre-sented, together with a 3D simulation analysis,which can explain the post coupler stabiliza-tion working principle and define a new tuningstrategy for DTL cavities. The PC tuning pro-cedure based on the equivalent circuit and onfrequency measurements has been tested andvalidated with measurements on the Linac4 DTLaluminum model.

TUP073 Electro-Dynamics Characteristics of RFWobbler Cell for Heavy Ion BeamS. Minaev (ITEP), N.N. Alexeev, A. Golubev,V.A. Koshelev, T. Kulevoy, B.Y. Sharkov, A. Sit-nikov (ITEP)Intense heavy ion beam is very efficient tool togenerate high energy density states in macro-scopic amounts of matter. As result it enablesunique methods to study astrophysical pro-cesses in the laboratory under controlled andreproducible conditions. For advanced experi-ments on high energy density physics the cylin-drical target irradiated by hollow cylindricalbeam is required. This combination providesextremely high densities and pressures on theaxis of imploding cylinder. A new method for



RF rotation of the ion beam is applied for re-quired hollow beam formation. The RF systemconsisting of two four-cell H-mode cavities isunder development for this purpose now. Thecavities frequency has been chosen 298 MHz,which is sufficient for uniform target illumina-tion at 100 ns pulse duration. The deflectingelectrodes shape has been optimized to providethe uniform deflection of all particles in beam’scross-section. The prototype of the deflector cellwas constructed. A measured electro-dynamicscharacteristic is presented. As well frequencycorrections methods are considered in this pa-per.

TUP074 LEBT Beam Tuning Using Neutralized Ionsin the SARAF Front EndL. Weissman (Soreq NRC), D. Berkovits,Y. Yanay (Soreq NRC)The SARAF front end is composed of a proton/deuteron ECR ion source and a LEBT to matchthe beam to a 4-rod RFQ. The LEBT is consist-ing of an analyzing magnet, an aperture, threemagnetic solenoid lenses and a diagnostic sys-tem. The typical operation vacuum, downstreamthe analyzing magnet, is of the order of 10-6

mbar at 5 mA analyzed beam current. In theemittance measurement we identify a beam ofsecondary-species particles, differently affectedby the solenoid and so arriving with a differentphase-space profile at the emittance detector.The secondary beam is the result of a chargeexchange interaction in which an ion interactswith residual gasses in the beam line, most likelyhydrogen gas coming from the ion source, andbecome neutral. For 20 keV protons collidingwith H2 the calculated ion neutralization rateis 1%/m/10-6 mbar. Since the neutral portionof the beam is not affected by the magnetic fo-cusing / steering elements, a none concentricneural and ion beams in the phase-space is ameasure of mistuned beam or misalign magnets.These effects were proved and followed by beamdynamics simulation and are used to match thebeam to the RFQ.

TUP075 Residual Gas Pressure Dependence onBeam LossA. Miura (JAEA/J-PARC), M. Ikegami (JAEA/J-PARC) H. Sako (JAEA) G.H. Wei (KEK/JAEA)Residual gas in beam transport line essentiallyaffects the beam loss and residual radiation onthe accelerator. J-PARC linac is usually operatedunder 1.0 ·10-6 to 1.0 ·10-5 Pa in SDTL and A0BTsections. In this situation, no serious beam loss



was observed during the beam operation. In fu-ture development of J-PARC linac, because thepeak beam energy and output will be increased,it is getting more serious problem. Before the de-velopment, it is important to understand a causeof beam loss and relation between beam loss andresidual gas pressure. We measured beam lossat the normal and worse vacuum condition inboth SDTL and A0BT sections. The result indi-cates that the beam loss depends on the residualgas pressure and position where the beam lossoccurs is about 20 to 30 meter downstream. Thissuggests the optimum position for installationof vacuum system to minimize the beam loss.In this paper, we describe the experimental re-sult and its discussions. In addition, the causeof the beam loss is considered to be a strippingfrom negative hydrogen ions to neutral hydrogenatoms. This mechanism is also discussed in thispaper.

TUP076 Status of Beam Loss Evaluation at J-PARCLinacA. Miura (JAEA/J-PARC), N. Kikuzawa,T. Maruta, K. Yamamoto (JAEA/J-PARC)Z. Igarashi, T. Miyao (KEK) M. Ikegami (J-PARC, KEK & JAEA) H. Sako (JAEA) S. Sato(JAEA/LINAC)Since November, 2007, J-PARC Linac has beenoperated at 7.2kW beam power. During theoperation, beam losses possibly caused by theH0 particles generated by the interaction be-tween H- beam and residual gas in the transportline were observed in the SDTL (Separated-typeDrift-Tube Linac) section. In the linac operation,Ar-CO2 gas proportional counters are employedfor the measurement of beam loss, but they arealso sensitive to background noise of X-ray emit-ted from RF cavities. In this section, protons,secondary hadrons and gamma rays would bemainly generated as a beam loss, but it is noteasy to estimate real beam loss using the propor-tional counter. The plastic scintillation counterswith less X-ray sensitivity and 3He proportionalcounters with high thermal neutron sensitivitywill be also employed to measure the beam loss.The combination of these detectors would bringmore accurate beam loss measurements withsuppression of X-ray noise. A measurement ofemission position and angle distributions of pro-tons due to H- beam loss is being planed. Thisresult would lead to clarify the source of beamloss. This paper reports status of beam loss eval-uation using these detectors.



TUP077 Solenoid-Based Focusing in a Proton LinacI. Terechkine (Fermilab), J. DiMarco,W. Schappert, D.A. Sergatskov, M.A. Tartaglia(Fermilab)Development of solenoid-based focusing lensesfor transport channel of an R&D linac front endat FNAL is in its final stage. Lenses for the roomtemperature section of the linac are assembledin individual cryovessels and certified using adevoted stand. During this certification process,for each lens, position of its optical axis relativeto the cryovessel is found in the warm and coldstate. Lenses for the superconducting sectionsare ready for production, and development ofa cryomodule to house multiple superconduct-ing lenses and RF cavities is in progress. Studieswere also conducted to measure fringe magneticfield of a lens in a cryomodule, to investigate alaser-based method of alignment, and to evalu-ate the extent of beam quality degradation dueto imperfections in lens construction and align-ment. This report presents some results of thesestudies.

TUP078 Test of a Coaxial Blade Tuner at HTS/FNALY.M. Pischalnikov (Fermilab), S. Barbanotti,E.R. Harms, A. Hocker, T.N. Khabiboulline,W. Schappert (Fermilab) A. Bosotti, C. Pa-gani, R. Paparella (INFN/LASA) M. Scorrano(INFN-Pisa)Fermilab is building Cryomodule 2 for ILCTA fa-cility at NML. A coaxial blade tuner has been cho-sen for the CM2 1.3GHz SRF cavities. A summaryof results from cold test of the tuners in the Fer-milab Horizontal Test Stand will be presented.

TUP079 SS Helium Vessel Development for 1.3 GHzSRF Cavities at FermilabN. Dhanaraj (Fermilab), S. Barbanotti,J.S. Brandt, H. Carter, M.H. Foley, J. Grimm(Fermilab)Fermilab is currently focusing its efforts towardthe development of Stainless Steel (SS) heliumvessels for its 1.3 GHz SRF cavities. The objec-tive is to transition towards the concept of usingSS helium vessels to dress the bare SRF cavities,thereby paving way for significant cost reductionand efficient production techniques for futureaccelerators. The biggest challenge has beento design a reliable interface between the nio-bium cavity end group and the stainless steel endflange that encloses the helium vessel. Fermilabhas been pursuing a brazed joint design to allowthis transition. Additional design challenges as-sociated with this transition are ensuring proper



cooling of the cavity, compensating for the dif-ference in thermal contraction between the SShelium vessel and niobium cavities, and alsomodification of the tuning procedure and en-suring the safety and reliability of the blade andpiezo tuners. Current efforts on the qualificationof the niobium-SS braze joint, finite elementsimulations of the thermal design aspects, benchtesting of actual cavity displacements, and studyof the effects on the tuners will be presented.

TUP080 Fermilab 1.3-GHz Cryomodule Cooldownand RF TestsS. Nagaitsev (Fermilab), B. Chase, E.R. Harms,A.L. Klebaner, J.R. Leibfritz, J. Reid (Fermilab)C. Adolphsen, C.D. Nantista (SLAC)The results of the cooldown and rf tests of theTesla-type cryomodule will be presented.

TUP081 Superconducting RF Cryomodule Produc-tion and Testing at FermilabM.S. Champion (Fermilab), T.T. Arkan,H. Carter, E.R. Harms, J.R. Leibfritz (Fermi-lab)Fermilab has produced two cryomodules for su-perconducting RF (SRF) applications to date.The first of these is an ILC prototype containingeight 1.3 GHz Tesla-type cavities and a supercon-ducting quadrupole. This cryomodule is of the’Type 3+’ design developed by the TESLA collab-oration. The assembly of this cryomodule wasaccomplished at Fermilab with much assistancefrom DESY and INFN-Milano. The cryomodulewas tested at Fermilab in the summer of 2010.The second cryomodule produced at Fermilabcontains four 3.9 GHz nine-cell cavities. The cav-ities and cryomodule were designed at Fermilab;the design concepts are quite similar to the 1.3GHz Type 3+ cryomodule. This cryomodule wasshipped to DESY, tested, and is now operating aspart of a third-harmonic system in the FLASH fa-cility. Fermilab plans to build five more 1.3 GHzcryomodules over the next several years for a to-tal of six, which will be installed and operated inthe New Muon Lab beam test facility at Fermilab.

TUP082 Cryomodule Tests of Tesla-like Cavities inS1-Global for ILCE. Kako (KEK), S. Noguchi, N. Ohuchi,M. Satoh, T. Shishido, K. Watanabe, Y. Ya-mamoto (KEK)Cryomodule tests of four Tesla-like supercon-ducting cavities is under preparation in the S1-Global project at KEK. Assembly of the cryomod-ule was started in January 2010, and the install-



tion in the STF tunnel was completed in April.First cool-down tests are scheduled in June. Thelow rf power tests of the Tesla-like cavities willbe carried out in July. The high rf power tests arescheduled between September and December,2010.

TUP083 Development and Application of the Explo-sion Welding Method for Manufacture ofTube Constructions in the System of the In-ternational Linear ColliderB.M. Sabirov (JINR)The results obtained by the JINR/Dubna-RFNC/Sarov-FNAL/Batavia-INFN/Pisa in designing thefourth-generation cryomodule for the ILC are re-ported. A technology for making a bimetallicTi+SS tube transition element by the explosionwelding method has been developed and im-plemented for the first time. All Ti+SS sampleswere subjected to the metallografic analysis andtested for strength and leaks at different cryo-genic temperatures. The leak rate at 1.8K was<10(-11)Pa.m(3)/s.For redesign cryomodule he-lium vessel we developed Nb+SS transition ele-ments using explosion welding technology. Pre-liminary tests shown reliable strehgth and den-sity of joint Nb+SS bonds. Upper limit of leak rateis (3-5).10(-10)atm.cc/s.

TUP084 Operational Experience with Cryomodulesfor Ion Linacs at Michigan State UniversityJ. Popielarski (NSCL), J. Bierwagen,S. Bricker, S. Chouhan, C. Compton, J. De-Lauter, K. Elliott, P. Glennon, W. Hartung,M. Hodek, M.J. Johnson, O.K. Kester, F. Marti,S.J. Miller, D. Morris, D. Norton, L. Popielar-ski, D. Sanderson, N.R. Usher, N. Verhanovitz,J.J. Vincent, J. Wlodarczak, R.C. York (NSCL)Michigan State University is developing cry-omodules for two projects: a 3 MeV per nucleonsuperconducting linac for re-acceleration of ex-otic ions (ReA3, under construction, requiring 4cryomodules), and a 200 MeV per nucleon driverlinac for the Facility for Rare Isotope Beams(FRIB, under design, requiring 52 cryomodules).The first two ReA3 cryomodules contain a totalof seven quarter-wave resonators for beta = 0.041and five superconducting solenoids (9 T). Thesecryomodules have been fabricated and installed,with testing underway. The third ReA3 cryomod-ule (requiring eight QWRs for beta = 0.085 andthree solenoids) is being fabricated. A fourthReA3 module consisting of a single quarter-waveresonator will be used for matching. A proto-type cryomodule for FRIB is being designed for



two beta = 0.53 half-wave resonators and onesolenoid. The experience so far with system per-formance of the cryomodules will be describedin this paper. Topics will include cavity per-formance, magnetic shielding, microphonics,cavity tuning, input coupler performance, andthermal loads.

TUP085 Cross Section Monitor for INR Linac BeamP.I. Reinhardt-Nickoulin (RAS/INR), A. Fes-chenko, S.A. Gavrilov, I.V. Vasilyev (RAS/INR)The monitor to measure a transverse cross sec-tion of the accelerated beam has been developedand implemented in INR Linac. Operation of themonitor is based upon utilization of residual gasionization. Ion flux cross section after extractionof the ions from the beam line by electrostaticfield and subsequent energy separation in elec-trostatic analyzer reproduces a transverse crosssection of the accelerator beam. Aµchannel plateintensifier followed by a phosphor screen is usedto observe ion cross section. The image is opti-cally transmitted to a CCD camera installed re-motely and shielded for protection. The moni-tor enables to observe beam cross section, beamprofiles and beam position, as well as their evolu-tion in time within a wide range of beam intensi-ties and energies. Monitor operation and param-eters are described. Some experimental resultsare presented.

TUP086 Emittance Measurements for Stable andRadioactive Ion BeamsS.A. Kondrashev (ANL), A. Barcikowski,F. Levand, P.N. Ostroumov, R.C. Pardo,G. Savard, R.H. Scott, T. Sun, R.C. Vondrasek,G.P. Zinkann (ANL)An emittance meter based on a pepper-pot cou-pled to a CsI (Tl) scintillator has been developedover the last several years [1] at Argonne NationalLaboratory. A compact version of such a probefor on-line emittance measurements has beendesigned, built and installed into the low energybeam transport (LEBT) line of the Argonne Tan-dem Linac Accelerator System (ATLAS) and alsodownstream of the gas catcher of the recentlycommissioned Californium Rare Isotope BreederUpgrade (CARIBU). The probe has demonstratedthe capability to measure emittance of ion beamswith a current density as low as 10 nA/cm2. Sys-tematic emittance measurements in the ATLASLEBT for different ion species have been doneand results will be presented. The probe, basedon a pepper-pot coupled to an MCP viewing sys-tem, has been designed and built to measure



the emittance of low intensity (102-106 ions/s)radioactive CARIBU ion beams.

TUP087 Beam Profile Measurements and Matchingat SNS: Practical Considerations and Ac-commodationsC.K. Allen (ORNL), W. Blokland, J. Galambos(ORNL)We present practical aspects of measuring beamprofiles and applications using the profile data.Standard applications include (RMS) beam sizecalculation, Courant-Snyder parameter calcula-tion, and beam matching. Each applicationbecomes increasingly model dependant relyingupon results of the preceding application. Be-cause of the cascade of interdependence, of ob-vious concern is measurement error which prop-agates throughout the calculations. Also impor-tant is the accuracy of the beam model usedto make calculations from measurement results;doubly so for matching where the model bothestimates Courant-Snyder parameters and pre-dicts new magnet strengths. Not as obvious arecomplications introduced by the long pulse na-ture of the SNS linac. Currently, we can samplethe beam only through a 50 microsecond win-dow along a macro pulse lasting up to 1 millisec-ond. Consequently the measurements availableare not necessarily representative of the wholebeam. Presented are quantitative results on mea-surement error, model accuracy, and samplinglocation, how these quantities vary along thelinac, and the ramifications on matching tech-niques.

TUP088 The Laser Emittance Scanner for 1 GeV H-

beam*D. Jeon (ORNL), A.V. Aleksandrov, W.P. Grice,Y. Liu, I. Nesterenko, A. Webster (ORNL)A.A. Menshov (RAS/INR)A transverse phase space laser emittance scan-ner is under fabrication for the 1-GeV H- beam ofthe SNS linac, using a laser beam as a slit. For a 1GeV H- beam, it is difficult to build a slit becausethe beam stopping distance is more than 50 cmin copper. We proposed to use a laser beam asan effective slit by stripping off the outer elec-tron of the H- (making it neutral) upstream ofa bending magnet and measuring the strippedcomponent downstream of the bend magnet.A brief discussion of the design and modelingof the system are presented. We are expectingto make a preliminary measurement from lateAugust 2010.



TUP089 Transverse Emittance Measurements inMEBT at SNSA.P. Zhukov (ORNL), A.V. Aleksandrov,A.P. Shishlo (ORNL)The latest modifications of the MEBT emittancescanner and the test results are presented. Thescanner consists of a slit and harp placed in theMEBT section of SNS Linac with H- energy of 2.5MeV. It was initially commissioned during theearly days of SNS. The initial design allowed toget information about beam core but was inca-pable of getting precise data about halo. Severalimprovements in hardware and software wereperformed recently. They significantly increasedsignal to noise ratio, reduced harp wires electroncoupling and increased scan speed. The latestmeasurements with the new system show a goodagreement with the simulation results from sim-ple models.

TUP090 Development of a Bunch Length DetectorJ.Y. Kim (SNU), H.-C. Bhang, D.G. Kim (SNU)J.-W. Kim (NCC, Korea)A bunch length detector has been designed andconstructed, which can measure current distri-butions inside the beam bunch. The device mea-sures secondary electrons that are emitted whenthe beam hits a negatively biased thin target wire.Two main components of the device are an rf de-flector to deflect secondary electrons vertically incorrelation with the rf time of the beam bunch,and microchannel plate to detect the electronsafter spatial discrimination. Rf properties of therf deflector were first numerically analyzed, anda full-scale cold model was built and tested usinga network analyzer. Microchannel plate detectorwas tested using a beta-emitting isotope source.The electron optics were calculated to design thestructure of the detector, and the actual detectorwill soon be constructed and tested using a cwproton beam from a cyclotron.

TUP091 Energy and Energy Spread MeasurementsUsing the Rutherford Scattering Techniquefor Tuning the SARAF SuperconductingLinacJ. Rodnizki (Soreq NRC), A. Perry, L. Weiss-man (Soreq NRC)The SARAF accelerator is designed to accelerateboth deuteron and proton beams up to 40 MeV.Phase I of SARAF consists of a a 4-rod RFQ (1.5MeV/u) and a superconducting module housing6 half-wave resonators and 3 superconductingsolenoids (4-5 MeV). The ions energy and en-ergy spread were measured using the Rutherford



scattering technique . This technique is usedto tune the cavities to the desired amplitudeand phase. The downstream HWR is used as abuncher and the beam energy spread as functionof the bunching RF voltage is applied to estimatethe longitudinal emittance. In this work, wepresent a longitudinal emittance measurementalgorithm, which is based on the bunch energyspread as a function of the buncher’s amplitude,similar to the standard algorithm that uses thebunches’ temporal spread. The tuning and mea-sured longitudinal parameters are in qualitativeagreement with the predicted beam dynamicssimulation.

TUP092 The ISAC II Current Monitor SystemM. Marchetto (TRIUMF), J. Aoki, K. Lang-ton, R.E. Laxdal, W.R. Rawnsley, J.E. Richards(TRIUMF)The post acceleration section of the ISAC ra-dioactive ion beam (RIB) facility is composed ofa radio frequency quadrupole (RFQ) followed bya drift tube linac (DTL), both room temperaturemachines, that serve a medium energy experi-mental area up to 1.8 MeV/u, and a supercon-ducting linac (SCLINAC) that serves a high en-ergy experimental area. This SCLINAC, com-posed of forty quarter wave resonators housedin eight cryomodules, is capable of a total accel-erating voltage of circa 40 MV. Since each cavityis phased independently at the maximum oper-ational voltage, the final energy depends on themass to charge ratio of the accelerated species. Inorder to deliver energies higher than 5 MeV/u weneed to monitor the beam current as mandatedby our operating license. The current monitorsystem (CMS) is composed of two non intercept-ing and one partially intercepting monitor. Thesignals from these three monitors are processedin a single control system that provides a go sig-nal to the Safety system enabling beam delivery.The CMS system allows to exploit the SCLINACto its full potential. In this paper we will presentboth hardware configuration and software con-trol of the CMS.

TUP093 Planned Diagnostics for the Facility forRare Isotope Beams at Michigan State Uni-versityS. Assadi (FRIB), M.J. Johnson, T.L. Mann,E. Pozdeyev, E. Tanke, X. Wu, R.C. York,Q. Zhao (FRIB) M. Doleans, F. Marti (NSCL)The Facility for Rare Isotope Beams (FRIB) atMichigan State University will utilize a highpower, heavy-ion linear accelerator to produce



rare isotopes in support of a rich program offundamental research. The linac will consistof a room temperature-based front-end systemproducing beams of approximately 0.3 MeV/u. Three additional superconducting linac seg-ments will produce beams of >200 MeV/u witha beam power of up to 400 kW. Because of theheavy-ion beam intensities, the required diag-nostics will be largely based on non-interceptiveapproaches. The diagnostics suites that will sup-port commissioning and operation are dividedinto lower energy <0.3 MeV/u front-end andhigher energy driver linac systems (<200 MeV/u for uranium). The instruments in the driverlinac include strip-line BPM, toroid, BCM, and3-D electron scanners to measure rms beamsize. A desired availability of >90% and an ag-gressive commissioning schedule lead to somechallenges in beam diagnostics requirementsthat will be addressed in this paper. We are com-mitted to using an architecture common with therest of FRIB for the data acquisition and timingwhich will also be discussed in this paper.

TUP094 Development of Cavity BPM for the Euro-pean XFELD. Lipka (DESY), D. Noelle, M. Siemens,S. Vilcins (DESY)The European XFEL, currently under construc-tion at the DESY site in Hamburg, require highprecision orbit control in the long undulator sec-tions and in addition in some other locations ofthe machine, like bunch compressors, matchingsections, or for the intra bunchtrain feedbacksystem. Due to the pulsed operation of the facil-ity the required high precision has to be reachedby single bunch measurements. So far only cav-ity BPMs achieve the required performance andwill be used at the European XFEL. We reporton the development of two types of cavity BPMsfor the intersection of the undulators with 10mm beam pipe and for sections with a standardbeampipe diameter of 40.5 mm. The prototypesfor both types show the properties as expectedfor simulation results. The paper further con-centrates on the industrialisation process. Itpoints out some traps and their cures during theproduction process.

TUP095 Standard Electron Beam Diagnostics forthe European-XFELD. Noelle (DESY)The European XFEL is a 4th generation syn-chrotron radiation source, under constructionin Hamburg. Based on different Free-Electron-



Laser and spontaneous sources, driven by a 17.5GeV superconducting accelerator, this interna-tional facility will provide several user stationswith photons simultaneously. Due to supercon-ducting technology high average as well as peakbrilliance can be delivered. Flexible bunch pat-tern are possible for optimum tuning to the ex-periments demands. This paper will present thecurrent status of the electron beam diagnostics.An overview of the entire system will be given, aswell as details on the development of the mainsystems like BPM, charge and transmission di-agnostics, beam size and beam loss monitorsystems will be presented. Furthermore, resultsof first measurements with XFEL prototypes inFLASH will be shown.

TUP096 First Results of Slice Emittance Diagnosticswith an Energy Chirped Beam at PITZYe. Ivanisenko (DESY Zeuthen), G. Asova,H.-J. Grabosch, M. Krasilnikov, M. Mah-goub, M. Otevrel, S. Rimjaem, F. Stephan(DESY Zeuthen) M.A. Khojoyan (YerPhI)G. Vashchenko (NSC/KIPT)Recent successes in existing FEL facilities op-eration and improvements in future FELs de-sign became possible due to detailed research inhigh-brightness electron beam production. Thephoto injector test facility in Zeuthen (PITZ) isthe DESY center for electron source characterisa-tion and optimisation. The new slice emittancediagnostics was recently commissioned at PITZ.In the measurement approach a bunch is accel-erated off-crest in the second accelerating cavityafter the gun, part of the bunch is selected aftera dipole with a slit along momentum, transverseemittance of the bunch part is measured using aquad or a slit scan. Test measurement results arepresented for 1 nC charge, flat-top and gaussianlongitudinal laser shapes. Following the interestin FEL operation with lower charge simulationswere performed to calculate the emittance reso-lution for different charge levels. The measure-ment experience, advantages and disadvantagesof the approach will be discussed.

TUP097 Methodical Studies for Tomographic Re-construction As a Novel Method For Emit-tance Measurements At the PITZ FacilityG. Asova (DESY Zeuthen), M. Krasilnikov,J. Saisut, F. Stephan (DESY Zeuthen) G. AsovaThe Photo-Injector Test Facility at DESY inZeuthen, PITZ, is dedicated to developmentof high brightness electron sources for linac-based FELs like FLASH and the European XFEL.



A key parameter to judge on the beam qualityfor an FEL is the transverse phase space distribu-tion, wherefrom the PITZ beamline is equippedwith three Emittance Measurement Systems asthe only dedicated to that apparatus. In 2010the diagnostics has been upgraded with a mod-ule for tomographic reconstruction comprisingthree FODO cells, each surrounded by two ob-servation screens. The anticipated advantagesof tomographic measurements are improvedresolution for low charge beams and ability toevaluate both transverse planes simultaneously.Major operational challenges are the low beamenergies the module will be used with - 15 - 30MeV, strong space charge effects for high bunchcharges and, consequently, difficulties to matchthe beam into the optics of the lattice. This con-tribution presents studies on the performanceof the module for different initial conditions asbunch charge and temporal laser pulse shape.Influence of residual noise on the quality of thereconstructed phase space is discussed.

TUP098 Wakefield Monitor Development for CLICAccelerating StructureF. Peauger (CEA), W. Farabolini, P. Gi-rardot (CEA) A. Andersson, G. Rid-done, A. Samoshkin, A. Solodko (CERN)R.J.M.Y. Ruber (Uppsala University) R. Zen-naro (PSI)To achieve high luminosity in CLIC, the acceler-ating structures must be aligned to an RMS accu-racy of 5 µm with respect to the beam trajectory.Position detectors called Wakefield Monitors(WFM) are integrated to the structure for a beambased alignment. This paper describes the re-quirements of such monitors. The developmentplan and basic feature of the WFM as well as theaccelerating structure working at 12 GHz and 100MV/m are shortly described. Then we focus ondetailed electromagnetic simulations and designof the WFM itself. In particular, time domaincomputations are performed and an evaluationof the intrinsic resolution is done for two higherorder modes at 17 and 24 GHz. The mechan-ical design of the accelerating structure withWFM is also presented. Precise machining witha tolerance of 2.5 µm and a surface roughnessof 0.025 µm is demonstrated. The fabricationstatus of three complete accelerating structureswith WFM is finally presented for a feasibilitydemonstration with beam in CTF3 at CERN.



TUP099 Longitudinal Beam Profile Diagnostics atCTF3 Based on Coherent Diffraction Radi-ationM. Micheler (JAI), R. Ainsworth, G.A. Blair,G.E. Boorman, V. Karataev, K. Lekomtsev(JAI) R. Corsini, T. Lefevre (CERN)Compact Linear Collider (CLIC) is a multi-TeVelectron-positron collider for particle physicsbased on an innovative two-beam accelerationscheme. The CLIC Test Facility 3 (CTF3, CERN)aims to demonstrate feasibility of this concept.The monitoring of a longitudinal profile will bevery important for the CLIC. The optimization ofthe longitudinal charge distribution in a bunchis crucial for the maximisation of the luminos-ity and also for an optimal performance of aCLIC drive beam. A setup for the investigationof Coherent Diffraction Radiation (CDR) fromtargets with various configurations as a tool fornon-invasive longitudinal electron beam profilediagnostics has been designed and installed inthe CRM line of the CTF3 [1, 2]. In this report wepresent the status of the experiment and resultson interferometric measurements of CDR froma single target configuration. Studies on down-stream background contribution in the CRM linehave been performed. Recently we have up-graded the system by installing a second target.In this report we shall also demonstrate the re-sults on simulations of CDR spatial distributionfrom the two target configuration.

TUP100 Measuring the Longitudinal Bunch Profileat CTF3A.E. Dabrowski (CERN), E. Adli, S. Bettoni,E. Bravin, R. Corsini, S. Doebert, D. Eg-ger, T. Lefevre, A. Rabiller, P.K. Skowronski,L. Soby, F. Tecker (CERN) H.-H. Braun (PSI)H. Shaker (IPM) M. Velasco (NU)The CLIC Test Facility 3 (CTF3) is being built andcommissioned by an international collaborationin order to test the feasibility of the proposedCompact Linear Collider (CLIC) two-beam ac-celeration scheme. The monitoring and controlof the bunch length throughout the CTF3 com-plex is important since this affects the efficiencyand the stability of the RF power production pro-cess. Bunch length diagnostics therefore forman essential component of the beam instrumen-tation at CTF3. This paper presents and com-pares longitudinal profile measurements basedon transverse RF deflectors, Streak camera andnon-destructive microwave spectrometry tech-niques.



TUP101 Wire Grid and Wire Scanner Monitors De-sign for the CERN LINAC 4F. Roncarolo (CERN), E. Bravin, C. Dutriat,G.J. Focker, U. Raich, VC. Vuitton (CERN)B. Cheymol (Université Blaise Pascal)As part of the CERN LHC injector chain upgrade,LINAC4 will accelerate H- ions from 45 keV to160 MeV. A number of wire grids and wire scan-ners will be used to characterize the beam trans-verse profile. This paper covers all monitor de-sign aspects intended to cope with the requiredspecifications. In particular, the overall measure-ment robustness, accuracy and sensitivity mustbe satisfied for different commissioning and op-erational scenarios. The physics mechanismsgenerating the wire signals and the wire resis-tance to beam induced thermal loads have beenconsidered in order to determine the most ap-propriate monitor design in terms of wire mate-rial and dimensions.

TUP102 Phase Space Analysis at the SwissFEL Injec-tor Test FacilityB. Beutner (PSI), R. Ischebeck, T. Schietinger(PSI)Phase I of the SwissFEL Injector Test Facility con-sists of a 2.6-cell S-band RF gun, a spectrometer,and a series of transverse beam diagnostic sys-tems such as YAG screens, slit and pepper-potmasks. Its primary purpose is the demonstra-tion of a high-brightness electron beam meet-ing the specifications of the SwissFEL main linac.Phase space characterization at beam energiesup to 7 MeV, where space charge still dominates,is performed with YAG screens in combinationwith slit- and pinhole (pepper-pot) masks. Ad-vanced image analysis is used to mitigate arte-facts due to background, pixel readout noise, ordark current. We present our data analysis proce-dure for the slit scan method, with particular em-phasis on image processing and its effect on thereconstructed emittance. Pepper-pot measure-ments using an independent analysis frameworkare used to cross-check the slit scan results.

TUP103 Transverse Profile Monitors for the Swiss-FEL Injector Test FacilityR. Ischebeck (PSI), B. Beutner, G.L. Or-landi, M. Pedrozzi, T. Schietinger, V. Schlott,V.G. Thominet (PSI)The SwissFEL Injector Test Facility consists of anRF gun, an accelerating section for a final en-ergy of 250 MeV, and two diagnostics sections.Transverse profiles of the electron beam can berecorded at 27 locations by imaging fluorescent



crystals that can be inserted into the beam. At21 of these, the fluorescent screens are comple-mented by optical transition radiation monitorsand wire scanners. Here, we will evaluate theperformance of transverse profile monitors ex-perimentally and numerically and compare themeasured profiles with a numerical model ofthe accelerator. Profile monitors are used inconjunction with a slit and a pepper pot to deter-mine the transverse phase space distribution ofthe bunches. Experimental measurements at theSwissFEL Injector Test Facility will be presented.

TUP104 Direct Measurement of Beam Direction Us-ing Axial B-dotsX. He (CAEP/IFP), Q. Li, K. Zhang (CAEP/IFP)Beam position monitors are very widely used inaccelerator diagnostics. Beam direction mea-surement can provide very useful information.Azimuthal B-dots (commonly referred B-dots)can be used to measure the beam position be-cause beam traveling off axis will generate dipoleterm of azimuthal magnetic field. Similarly,dipole term of axial magnetic field will be gen-erated by the beam traveling with a direction notparallel with the pipe axis. In this paper, theoret-ical results are given to show how the axial B-dotworks. And Mafia simulations are carried out tocheck the theoretical results. Simulation resultsagree with the theoretical results very well.

TUP105 A Carbon Foil Stripper for FRIBF. Marti (NSCL), S. Hitchcock, O.K. Kester,J.C. Oliva (NSCL)The US Department of Energy Facility for RareIsotope Beams (FRIB) at Michigan State Univer-sity includes a heavy ion superconducting linaccapable of accelerating all ions up to uraniumwith energies higher than 200 MeV/u and beampower up to 400 kW. At an energy of approxi-mately 17 MeV/u we plan to strip the beam to re-duce the voltage needed in the rest of the linacto achieve the final energy. The design of thestripper is a challenging problem due to the highpower deposited (approximately one kW) in thestripper media by the beam in the small beamsize. One of the options being considered is a car-bon foil stripper. We have developed a test cham-ber to study the thermal mechanical propertiesof different stripping media candidates (amor-phous carbon, graphene, diamond). This cham-ber utilizes an electron beam to deposit powerssimilar to what the FRIB stripper will see in oper-ation. The thermo-mechanical studies are a nec-essary condition but not sufficient. The effect of



radiation damage must also be studied. We haveutilized heavy ions (Pb) from the K500 cyclotronto study this issue. We present in this paper asummary of the requirements and the status ofthe studies.

TUP106 Development of Stripper Options for FRIBF. Marti (NSCL) A. Hershcovitch, P. Thieberger(BNL) Y. Momozaki, J.A. Nolen, B. Reed (ANL)The US Department of Energy Facility for RareIsotope Beams (FRIB) at Michigan State Univer-sity includes a heavy ion superconducting linaccapable of accelerating all ions up to uraniumwith energies higher than 200 MeV/u and beampower up to 400 kW. To achieve these goals withpresent ion source performance it is necessaryto accelerate simultaneously two charge statesof uranium from the ion source in the first sec-tion of the linac. At an energy of approximately17 MeV/u we plan to strip the uranium beamto reduce the voltage needed in the rest of thelinac to achieve the final energy. Up to five dif-ferent charge states are planned to be acceler-ated simultaneously after the stripper. The de-sign of the stripper is a challenging problem dueto the high power deposited (approximately onekW) in the stripper media by the beam in a smallspot. To assure success of the project we have es-tablished a research and development programthat includes several options: carbon or dia-mond foils, liquid lithium films, gas strippers andplasma strippers. We present in this paper asummary of the requirements and a general de-scription of the status of the different options.

TUP107 RF Pulse Compressors for Muon Accelera-torsM. Popovic (Fermilab), A. Moretti (Fermilab)R.P. Johnson, M.L. Neubauer (Muons, Inc)Muon Colliders and Neutrino Factories, exam-ples of future muon accelerators at the energyand intensity frontiers, can be made affordableand practical with a new technique based onhigh-gradient RF cavities filled with dense hydro-gen gas. To fully exploit this conceptual break-through, new high power RF sources are needed.The novel idea of using pressurized RF cavitiesfor muon accelerators leads to conceptually sim-ple designs with better beam cooling and severalengineering advantages, including the potentialof much higher accelerating gradients. This doc-ument proposes to develop power sources forthese high gradient RF cavities based on pulsecompression techniques using cryogenic energystorage cavities. The goal is to design a complete



cryogenic pulse compressor system to be built,tested, and used to develop switching techniquesand coupling strategies. Critical technical issuesrelevant to RF power in muon accelerators areidentified for computational and experime ntalinvestigation.

TUP108 Bunch Recombination for a Muon ColliderD.V. Neuffer (Fermilab), K. Yonehara (Fermi-lab) C. Y. Yoshikawa (Muons, Inc)Cooling scenarios for a high-luminosity MuonCollider require bunch recombination for opti-mal luminosity. In this report we note that thetunable chronicity property of a helical transportchannel (HTC) makes it a desirable componentof a bunch recombiner. A large chronicity HTCis desirable for the bunch recombining trans-port, while more isochronous transport is pre-ferred for rf manipulations. Scenarios for bunchrecombination are presented, in which an off-harmonic rf muon linac is used to simultane-ously bunch beams within a string of buncheswhile placing bunch centers at different energiessuitable for recombination in the HTC.

TUP109 Large Acceptance Linac for Muon Accelera-tionH.M. Miyadera (LANL), A.J. Jason, S.S. Kuren-noy (LANL)Muon accelerators are studied for future neu-trino factory and muon colliders (NF/MC). Onthe other hand, a compact muon acceleratorcan be applicable to muon radiography whichis a promising probe to investigate large ob-jects. We worked on simulation studies on acompact muon linear accelerator. The designedlinac has a large energy and a phase acceptanceto capture lower energy pion/muon (10 - 100MeV) than the NF/MC scenario and acceleratesthem to 200 MeV without any beam cooling.Our current design adopts 805 MHz zero-modenormal-conducting cavities with 35 MV/m peakfield*. The superconducting solenoids are usedto provide 5-T focusing field on the normal con-ducting cavities. We developed a Monte Carlosimulations code to optimize linac parameters.Muon energy loss and scattering effects at theaperture windows are included, too. The simu-lation showed that about 10 % of the pion/muoninjected into the linac can be accelerated to 200MeV. Further acceleration can be done with su-perconducting linac.



TUP110 Mass Production Report of C-Band RFPulse CompressorK. Okihira (MHI)C-band RF pulse compressor is a device that gen-erates high peak RF-power by saving, and com-pressing the RF-power output from the klystron.XFEL project is scheduled to be installed 64 pulsecompressor units, 2009 of December we havecompleted the fabrication and RF measurementof all units. A high-power examination was con-ducted in the test stand at RIKEN. The RF outputof the pulse compressor is 260 MW in peak value,and the acceleration gradient of the acceleratingstructure is achieved to be 40 MV/m.It reports onthe mass production passage of these 64 C-BandRF pulse compressors and on the installationresult of injector section.

TUP111 Goals and Status of MICE, the InternationalMuon Ionization Cooling ExperimentV.C. Palladino (INFN-Napoli)Muon ionization cooling provides the only prac-tical solution to prepare high brilliance beamsnecessary for a neutrino factory or muon col-liders. The muon ionization cooling experiment(MICE) is thus a strategic R&D project for neu-trino physics. It is under development at theRutherford Appleton Laboratory (UK). It com-prises a dedicated beam line to generate a rangeof input emittance and momentum, with time-of-flight and Cherenkov detectors to ensure apure muon beam. A first measurement of emit-tance is performed in the upstream magneticspectrometer with a scintillating fiber tracker. Acooling cell will then follow, alternating energyloss in liquid hydrogen and RF acceleration. Asecond spectrometer identical to the first oneand a particle identification system provide ameasurement of the outgoing emittance. In the2010 run, completed in August, the beam andmost detectors have been fully commissioned.The time of the first measurement of input beamemittance is closely approaching. The plan ofsteps of measurements of emittance and emit-tance reduction (cooling), that will follow in 2011and later, will be reported.




WE1 — Invited OralChair: R. Garoby (CERN)

WE10109:00

Design of Project-X LinacN. Solyak (Fermilab)Project X is a proposed high-intensity H- acceler-ator complex that could provide beam for a va-riety of physics projects: neutrino-, kaon- andmuon-based precision experiments. Other ap-plications are under investigation. In the cur-rent proposal CW 3MW linac would contains fewtypes of superconducting cavities and focisingelements to accelerate beam from 2.5 MeV up to3 GeV. The paper presents the status of the 3GeVx 1mA CW linac, including design and testing ofthe linac components, beam physics studies andfuture plans.

WE10209:30

SARAF Accelerator Commissioning Resultsand Phase II Construction StatusL. Weissman (Soreq NRC), D. Berkovits,I. Gertz, A. Grin, S. Halfon, G. Lempert,I. Mardor, A. Nagler, A. Perry, J. Rodnizki(Soreq NRC) A. Bechtold (NTG) K. Dunkel,M. Pekeler, C. Piel (RI Research InstrumentsGmbH)The Soreq Applied Research Accelerator Facil-ity, SARAF, is currently under construction atSoreq NRC. SARAF is based on a continuouswave (CW), proton/deuteron RF superconduct-ing linear accelerator with variable energy (5’40MeV) and current (0.04-2 mA). Phase I of SARAFconsists of a 20 keV/u ECR ion source, a lowenergy beam transport section, a 4-rod RFQ, amedium energy (1.5 MeV/u) transport section,a superconducting module housing 6 half-waveresonators and 3 superconducting solenoids, adiagnostic plate and a beam dump. Phase IIwill include 5 additional superconducting mod-ules. We present the commissioning results ofSARAF Phase I. These results include the firstever proton and deuteron beams to be acceler-ated through have-wave resonators. We acceler-ated low duty cycle proton and deuteron beamswith instantaneous currents of 3 mA up to above3 and 4 MeV, respectively. Furthermore, we ac-celerated a CW 1.4 mA proton beam up to above3 MeV. Based on the results of Phase I, Phase IIis now being designed. Details of the new designand comparison to Phase I will be presented.



WE10310:00

Status of Linac4 Construction at CERNM. Vretenar (CERN)Linac4 is a 160 MeV normal-conducting H- linearaccelerator which is being built at CERN in theframe of a program for increasing the luminos-ity of the LHC. The project started in 2008 anddelivery of beam to the CERN accelerator chainis foreseen from early 2015. The new linac willbe housed in an underground tunnel close to thepresent Linac2; a surface building will house RFand other infrastructure. The civil engineeringwork started in October 2008 will be soon com-pleted. Installation of the infrastructure will takeplace in 2011, and from 2012 will be installedthe main machine elements. The ion source ispresently operational on a test stand, where itwill be followed in 2011 by a 3 MeV RFQ underconstruction in the CERN workshops. Prototypesof the three different types of accelerating struc-tures have been tested; construction of the 22accelerating cavities has started, supported by anetwork of agreements with external laboratoriesand institutions. Commissioning will take placein stages, starting from January 2013. Startingin March 2014 is foreseen a six-month reliabilityrun, in preparation for its role as the new sourceof particles for the CERN complex.

WE10410:20

Overview and Future Demands of FastChoppersA.V. Aleksandrov (ORNL)This talk will give an overview of future demandsof fast choppers with fast rise/fall time to reducethe beam extinction ratio further.


WE2 — Invited OralChair: S. Fu (IHEP Beijing)

WE20111:00

Operation and Upgrades of the LCLSJ.C. Frisch (SLAC)The LCLS FEL began user operations in Septem-ber 2009, with photon energies from 800eV to 2KeV and pulse energies above 2 mJ. Both longpulse (50-200 femtosecond FWHM) and shortpulse (<10 femtosecond FWHM at 150 uJ) pulseswere delivered at user request. In addition theFEL was operated at fundamental photon ener-gies up to 10 KeV in preparation for hard X-rayexperiments. FEL operating parameters, perfor-mance and reliability results will be presented, inaddition to plans for upgrades to the facility.



WE20211:20

Upgrade of the PLS (Pohang Light Source)Linac for the PLS-IIS.J. Park (PAL), J.Y. Choi, C. Kim, K.R. Kim,M. Kim, S.H. Nam, S.S. Park (PAL)Since its completion in 1993, the PLS (PohangLight Source) linear accelerator has been oper-ated as the full energy injector to the PLS stor-age ring - a 2.5-GeV 3rd generation light source inKorea. After successful services for more than 15years to the Korean synchrotron radiation users’community, the PLS is now being upgraded tomeet ever-increasing user demands for brighterlights. The PLS-II, the major upgrade program tothe PLS, is to increase the beam energy to 3 GeV,changing the storage ring lattice to accommo-date large number of insertion devices with loweremittance, and to have the top-up injection asthe default operating mode. In order to providethe top-up injections at the full energy of 3 GeV,several acceleration modules will be added to theend of the machine. In order to achieve highinjection efficiency (> 80%), beam qualities in-cluding the energy spread, pulse length, and jit-ters in bunch arrival times to the storage ring rfbucket have to be reduced. After successful up-grade of the PLS linac one could further exploitits potential by, for example, implementing high-brightness electron source, which would openup new possibilities with the facility

WE20311:40

First Simultaneous Top-up Operation ofThree Different Rings in KEK Injector LinacM. Satoh (KEK)The KEK injector linac sequentially providesbeams to four storage rings: a KEKB low-energyring (LER) (3.5 GeV/positron), a KEKB high-energy ring (HER) (8 GeV/electron), a PhotonFactory ring (PF ring; 2.5 GeV/electron), and anAdvanced Ring for Pulse X-rays (PF-AR; 3 GeV/electron). So far, beam injection to the PF ringand PF-AR had been carried out twice a day,whereas the KEKB rings had been operated inthe continuous injection mode (CIM) for keepingstored currents almost constant. The KEK linacupgrade project has started since 2004 so thatthe PF top-up and KEKB CIM can be operated atthe same time. The goal is to inject the beams ofdifferent energy into the three independent ringsin every 20 ms, where the common DC magnetsettings are utilized for beams having differentenergy and charge, whereas different optimizedrf phases are applied to each beam accelerationby using a fast low-level rf control up to 50 Hz.With this noble operation scheme, a simultane-ous top-up operation for different three rings



was achieved for the first time over the world,and has been stably in operation since last April.We report the operation scheme and status indetail.




TH1 — Invited OralChair: R.E. Laxdal (TRIUMF)

TH10109:00

Raising the Bar on Superconducting Nio-bium Cavity Production, Processing, andPerformanceZ.A. Conway (CLASSE)This talk will give an overview of recent results onthe highest gradient SRF cavities, including new,improved surface treatments and cavity repair.Significant recent progress has been made in un-derstanding gradient limiting effects, and how tocure them. Many of these results will be reviewedhere.

TH10209:30

SRF and Cryomodule R+D for ERL’sJ. Knobloch (Helmholtz-Zentrum Berlin fürMaterialien und Energie GmbH, Elektronen-Speicherring BESSY II)A review of the SRF and cryomodule R&D for var-ious ERL projects around the world. Many chal-lenging R&D problems will be addressed such ashigh average current SRF injectors and CW highgradient SRF modules.

TH10310:00

Development and Future Prospects of RFSources for Linac ApplicationsE. Jensen (CERN)This talk gives an overview of recent results andfuture prospects on RF sources for linac applica-tions, including klystrons, magnetrons and mod-ulators.

TH10410:30

Power Coupler Development for High In-tensity Superconducting LinacsG. Devanz (CEA)Recent developments and promising results areshowing the feasibility of 1 MW power couplersfor superconducting cavities accelerating highintensity proton beam for projects such as SPL,ESS, EURISOL.


TH2 — Invited OralChair: M. Popovic (Fermilab)

TH20111:30

SRF Linac for Indian Energy ProgramC.S. Mishra (Fermilab) V.C. Sahni (BARC)Indian Institutions in collaboration with Fermi-lab are engaged in the R&D of a high intensity Su-perconducting Radio Frequency proton linac forAccelerator Driven Subcritical System. The talkwill outline the current status and future plans.



TH20211:50

VECC/TRIUMF Injector for the e-LinacProjectV. Naik (DAE/VECC), A. Bandyopadhyay,A. Chakrabarti, S. Dechoudhury, M. Mon-dal (DAE/VECC) F. Ames, R.A. Baartman,C.D. Beard, Y.-C. Chao, R.J. Dawson, P. Kolb,S.R. Koscielniak, R.E. Laxdal, M. Mar-chetto, L. Merminga, A.K. Mitra, T.C. Ries,I. Sekachev, V.A. Verzilov, F. Yan (TRIUMF)D. Longuevergne (UBC & TRIUMF)TRIUMF (Canada) and VECC (India) are bothplanning to use the photo-fission route for pro-ducing neutron-rich radioactive ion beams intheir respective RIB programmes. With this com-mon goal the two institutes have entered into acollaboration to jointly design and develop asuperconducting 1.3GHz 50MeV, 10 mA, CWelectron linac which will be used as the fissiondriver. The first phase of the e-Linac collabora-tion aims at the development, production andfull technical and beam test of a 10MeV injectorcryo module (ICM) which forms the front-end ofthe final linac. The design and technical devel-opment of the ICM will be presented.


TH3 — Invited OralChair: P.N. Ostroumov (ANL)

TH30113:40

Beam Dynamics Studies for Multi-GeV Pro-ton and H-minus LinacsJ.-P. Carneiro (Fermilab)Significant advances were demonstrated in thedesign and computer simulations of multi-GeVproton and H-minus linacs. Several codes wereapplied for the simulation of 8 GeV linac and re-sulted to extremely good coincidence of all beamparameters. New procedures such as stripping ofH-minus ions due to various mechanisms wereimplemented into the tracking code. The authorof this presentation has several publications inPRSTAB and Nuclear Instruments on various as-pects of beam dynamics for 8 GeV linac.

TH30214:00

Source and Injector Design for IntenseLight Ion Beams Including Space ChargeNeutralisationN. Chauvin (CEA)New PIC ray-tracing methods allows to designand simulate the transport of high intensity pro-ton, H- and deuteron beam in the LEBT sys-tems of future facilities like FAIR Proton Linacor IFMIF-EVADA and SPIRAL2 deuteron linacs.These techniques enable a precise prediction of



the effect of residual gas ionisation and the con-sequent neutralisation of the large beam spacecharge on the beam emittances.

TH30314:20

Experimental Observation of Space ChargeDriven Resonances in a LinacL. Groening (GSI), W.A. Barth, W.B. Bayer,G. Clemente, L.A. Dahl, P. Forck, P. Gerhard,I. Hofmann, M. Kaiser, M.T. Maier, S. Mickat,T. Milosic, S.G. Yaramyshev (GSI) D. Jeon(ORNL) D. Uriot (CEA)Recent experiments at the Universal Linear Ac-celerator (UNILAC) at GSI provided evidence forspace charge driven resonances along a periodicDTL. A transverse fourth order resonance hasbeen detected by recording the four fold sym-metry in phase space. As predicted in [D. Jeonet al., Phys. Rev. ST Accel. Beams 12, 054204(2009)], the resonance dominates over the enve-lope instability. Additionally, evidence for reso-nant emittance transfer from the longitudinal tothe transverse plane has been found for settingsproviding equal depressed tunes of the involvedplanes.

TH30414:40

Linear Induction Accelerators at the LosAlamos National Laboratory DARHT Facil-ityS. Nath (LANL)The Dual-Axis Radiographic Hydrodynamic TestFacility (DARHT) at Los Alamos National Labo-ratory consists of two linear induction accelera-tors at right angles to each other. The First Axis,operating since 1999, produces a nominal 20-MeV, 2-kA single beam-pulse with 60-nsec width.In contrast, the DARHT Second Axis, operatingsince 2008, produces up to four pulses in a vari-able pulse format by slicing micro-pulses outof a longer 1.6-microseconds (flat-top) pulse ofnominal beam-energy and -current of 17 MeVand 2 kA respectively. Bremsstrahlung radia-tion, shining on a hydro-dynamical experimen-tal device, is produced by focusing the elec-tron beam-pulses onto a high-Z target. Variablepulse-formats allow for adjustment of the pulse-to-pulse doses to record a time sequence of x-rayimages of the explosively driven imploding mockdevice. In this talk, we present a sampling of thenumerous physics and engineering challengesencountered and the solutions thereof that ledto the present fully operational dual axes capa-bility. First successful simultaneous use of boththe axes for a hydrodynamic experiment wasachieved in 2009.




TH4 — Contributed OralChair: K.C.D. Chan (LANL)

16-Sep-10 16:00–18:00 Poster Rooms 101, 102, 201THP — Poster

THP001 FNAL HINS Beam Measurements and theFuture of High Intensity Linac Instrumen-tationV.E. Scarpine (Fermilab), S. Chaurize,B.M. Hanna, S. Hays, J. Steimel, R.C. Webber,M. Wendt, D. Wildman, D.H. Zhang (Fermi-lab)The intensity frontier, having been identifiedas one leg of the future of particle physics, canbe meet by the development of a multi-GeVhigh-intensity linac. In order to address thelow-energy needs of such an accelerator, Fer-milab started the High Intensity Neutrino Source(HINS) project. HINS is a research project toaddress accelerator physics and technologyquestions for a new concept, low-energy, high-intensity, long pulse H- superconducting linac.The development of such an accelerator putsstrict requirements on beam diagnostics. Thispaper will present beam measurement results ofthe HINS ion source and 2.5 MeV RFQ as well asdiscuss the role of HINS as a test facility for thedevelopment of future beam diagnostic instru-mentation required for the intensity frontier.

THP002 Design Study of Front-End System forProject XS. Nagaitsev (Fermilab), M. Popovic, G.V. Ro-manov, R.C. Webber, V.P. Yakovlev (Fermilab)Q. Ji, D. Li, T. Schenkel, J.W. Staples, S.P. Vi-rostek (LBNL)A multi-MW proton facility, Project X has beenproposed and currently under development atFermilab. Project X is critical for future devel-opment of accelerator complex for future highenergy physics programs in the US. In collabora-tion with Fermilab, LBNL is actively involved inthe development and design studies of the front-end system for Project X. The front-end systemwould consist of H- ion source(s), low-energybeam transport (LEBT), normal conducting CWRadio-Frequency-Quadrupole (RFQ) accelera-tor(s), medium-energy beam transport (MEBT),beam chopper(s) and normal conducting CWrebuncher cavities. We will review and presentR&D programs and recent study progress on thefront-end system of Project X. These studies may



include beam dynamics simulations and con-cepts for LEBT, RFQ, MEBT and narrow bandchopper, and preliminary conceptual designs ofnormal conducting CW RFQ(s) and rebunchercavities.

THP003 Diagnostic Lines for Commissioning of theCERN Linac4B. Mikulec (CERN), G. Bellodi, K. Hanke,T. Hermanns (CERN) M. Eshraqi (ESS)Linac4 will be the new linear accelerator of theCERN accelerator chain delivering H- ions at 160MeV from 2015. The increased injection en-ergy compared to the 50 MeV of its predecessorLinac2, combined with a H- charge-exchange in-jection, will pave the way to reach ultimate goalsfor the LHC luminosity. An extensive commis-sioning phase for Linac4 is planned during 2013.For this purpose, the beam will be studied afterthe exit of Linac4 in a straight line ending at theLinac4 dump, equipped with various beam in-struments. An almost 180 m long transfer linewill guide the beam to the charge exchange injec-tion point at the entry of the Proton SynchrotronBooster. About 50 m upstream of this point, twomeasurement lines will be upgraded to performin the second half of 2014 transverse emittancemeasurements as well as absolute energy and en-ergy spread measurements of the Linac4 beam.A detailed description of the beam measurementprinciples and setups at these three Linac4 diag-nostics lines related to distinct Linac4 commis-sioning phases will be given.

THP004 Layout and Machine Optimisation for theSPL at CERNF. Gerigk (CERN), S. Calatroni, O. Cap-atina, E. Ciapala, R. Garoby, A.M. Lombardi,V. Parma, W. Weingarten, S. Weisz (CERN)During the past 2 years the SuperconductingProton Linac (SPL) study has grown into an in-ternational collaboration with the goal of opti-mising the architecture of a pulsed supercon-ducting (SC) high-power proton linac. This effortincludes the study and prototyping of majortechnical components, such as SC high-gradientcavities, power couplers, the RF distribution sys-tem, HOM couplers, cryo-modules, focusingelements, etc. Even though the effort is drivenby CERN specific needs, the established designprinciples are valid for a range of superconduct-ing linac projects. In this paper we report onthe latests decisions concerning the machinearchitecture and on the ongoing R&D effort fortechnical components.



THP005 Beam Dynamics Optimisation of Linac4Structures for Increased Operational Flexi-bilityG. Bellodi (CERN), M. Eshraqi, M.G. Gar-cia Tudela, L.M. Hein, J.-B. Lallement,A.M. Lombardi, P.A. Posocco, E. Sargsyan(CERN) J. Stovall (TechSource)Linac4 is a new 160 MeV, 40 mA average beamcurrent H- accelerator which will be the sourceof particles for all proton accelerators at CERN asfrom 2015. Construction started in October 2008,and beam commissioning of the 3MeV frontendis scheduled for early next year. A baseline de-sign of the linac beam dynamics was completed2 years ago and validated by a systematic cam-paign of transverse and longitudinal error stud-ies to assess tolerance limits and machine acti-vation levels. Recent studies have been mainlyfocused on optimising this design to achieveboth a smoother performance for nominal beamconditions and to gain operational flexibilityfor non-nominal scenarios. These include a re-view of the chopper beam dynamics design, are-definition of the DTL and CCDTL inter-tankregions and a study of operational schemes forreduced beam currents (either permanent or inpulse-to-pulse mode). These studies have beencarried out in parallel to first specifications fora beam commissioning strategy of the linac andits low-energy front-end.

THP006 Accuracy Determination of the CERNLINAC4 Emittance Measurements at theTest Bench for 3 and 12 MeVF. Roncarolo (CERN), G. Bellodi, E. Bravin,U. Raich (CERN) B. Cheymol (UniversitéBlaise Pascal)The CERN LINAC4 commissioning will start in2011, at first in a laboratory test stand wherethe 45 KeV H- source is already installed andpresently tested, and later in the LINAC4 tunnel.A movable diagnostics bench will be equippedwith the necessary sensors capable of character-izing the H- beam in different stages, from 3 MeVup to the first DTL tank at 12 MeV. In this paperwe will discuss the accuracy of the transverseemittance measurement that will be performedwith the slit-grid method. The system’s mechan-ical and geometric parameters have been deter-mined in order to achieve the required resolutionand sensitivity. Space charge effects during thebeam transfer from the slit to the grid and scat-tering effects at the slit have been considered todetermine the overall emittance measurementaccuracy.



THP007 Overview of the CERN LINAC4 Beam In-strumentationF. Roncarolo (CERN), U. Raich (CERN)The CERN LINAC4 will represent the first up-grade of the LHC injection chain, by accel-erating H- ions from 45 KeV to 160 MeV forcharge-exchange injection of protons into the PSBooster. In order to provide its safe and efficientcommissioning and operation, a wide varietyof beam diagnostics devices has been designedfor installation at convenient locations all overthe accelerator length and in the transfer lineto the PS Booster. This paper gives an overviewof all instrumentation devices, including thoseto measure beam position, transverse and lon-gitudinal profile, beam current and beam loss.The well advanced status of the system design aswell as first results from tests at low energy arediscussed. The results are compared to the func-tional specifications under various operationalscenarios.

THP008 CW RF System of the ProjectX AcceleratorFront-endT.N. Khabiboulline (Fermilab), I.G. Gonin,V.P. Yakovlev (Fermilab)Front end of a CW linac of the Project X con-tains a H- source, an RFQ, a medium energytransport line with the beam chopper, and a SClow-beta linac that accelerates H- from 2.5 MeVto 160 MeV. SC Single ’ spoke Resonators (SSR)will be used in the linac, because Fermilab al-ready successfully developed and tested a SSRfor beta 0.21. Two manufactured cavities achieve2-3 times more than design accelerating gradi-ents. One of these cavities completely dressed,e.g. welded to helium vessel with integratedslow and fast tuners, and tested in CW and pulseregimes. Successful tests of beta=0.21 SSR giveus a confidence to use this type of cavity for lowbeta (0.117) and for high- beta (0.4) as well. Bothtypes of these cavities are under development.In present report the basic constrains, parame-ters, electromagnetic and mechanical design forall the three SSR cavities, and first test results ofbeta=0.21 SSR are presented.

THP009 Critical Dipole Modes in JLAB UpgradeCavitiesF. Marhauser (JLAB), K. Tian, H. Wang(JLAB)The 12GeV upgrade of CEBAF is currently inprogress. Ten new cryomodules will be installedat completion of the project to increase theenergy from 6GeV to 12GeV. Each cryomodule



houses eight seven-cell Low Loss type cavities.The damping of HOMs is crucial to prevent frombeam break-up (BBU) instabilities at the desiredbeam currents as experienced with an upgradedemonstration cryomodule which needed to bede-installed recently. Detailed HOM surveys ofa complete string of cavities in a cryomodule aswell as individual cavities revealed the existenceof critical dipole modes below and above beamtube cutoff that needed extensive experimentaland numerical analyses. Results and their con-sequences for the 12 GeV upgrade cryomodulesare detailed.

THP010 Exploiting New Electrochemical Under-standing of Niobium Electropolishing forImproved Performance of SRF Cavities forCEBAFC.E. Reece (JLAB)Recent incorporation of analytic electrochem-istry into the development of protocols for elec-tropolishing niobium SRF cavities has yieldednew insights for optimizing this process for con-sistent, high-performance results. Use of refer-ence electrodes in the electrolyte, electrochemi-cal impedance spectroscopy (EIS), rotating diskelectrodes (RDE), and controlled sample temper-atures has greatly clarified the process dynamicsover the empirical understanding developed viayears of practice. Minimizing rf losses at high op-erational gradients is very valuable for CW linacs.Jefferson Lab is applying these new insightsto the low-loss 7-cell cavity design developedfor the CEBAF 12 GeV Upgrade. Together withcontrolled cleaning and assembly techniquesto guard against field-emission causing particu-lates, the resulting process is yielding consistentcavity performance that exceeds project require-ments. Cavity tests show BCS-limited Q wellabove 30 MV/m. Detailed process data, interpre-tation, and resulting rf performance data will bepresented.

THP011 SC Third Harmonic Cavity Modal SpectraAnalysis for FLASHP. Zhang (UMAN), R.M. Jones, N. Juntong,I.R.R. Shinton (UMAN) N. Baboi, B. Lorbeer,P. Zhang T. Flisgen, H.-W. Glock (RostockUniversity, Faculty of Computer Science andElectrical Engineering) T.N. Khabiboulline(Fermilab)Third harmonic superconducting cavities havebeen designed and fabricated by FNAL to min-imise the energy spread along bunches in theFLASH facility at DESY. A module, consisting of



four 9-cell 3.9GHz cavities, has been installedin the Cryo-Module Test Bench (CMTB) facil-ity at DESY and transmission measurementshave been completed on all cavities. This cryo-module has subsequently been installed inFLASH. Experimental measurements on modespectra, both with and without beam-excitation,are analysed and compared to simulations.Higher order modes are able to propagate toadjacent cavities through attached beam tubes.The consequences of this coupling on the modalspectra are investigated.

THP012 Higher Order Modes in Third HarmonicCavities at FLASHR.M. Jones (UMAN), I.R.R. Shinton (UMAN)Transverse modes in the 3.9 GHz cavities de-signed and fabricated by FNAL are reported on.These modes have the potential to cause signif-icant emittance dilution if they not sufficientlysuppressed. Recent experiments, both probe-based and beam-excited, have indicated signif-icant discrepancies between modes predicted instand-alone 9-cell cavities compared to those in4-cavity modules. We employ a suite of com-puter codes and circuit models to analyze thesemodes, coupled through beam tubes whose cut-off is above that of the first dipole band. We alsoreport on preparations to instrument the higherorder mode couplers with electronics suitable fordiagnosing both the beam and cavity position,based on modes with sufficient R/Q values.

THP013 Testing of Nb Material for the XFEL Pre-series ProductionA. Brinkmann (DESY), M. Lengkeit,W. Singer, X. Singer (DESY)For the XFEL cavity production a rather largequantity of niobium sheets from partially newniobium vendors has to be delivered accordingto the XFEL Cavity Specification. It is of highimportance that the material monitoring of thisniobium has to be done within the productionprocess to ensure a high performance of the cav-ities. The quality assurance program includeselectrical measurements, mechanical, structuraland chemical material analysis. For the surfaceinvestigations two eddy current scanning deviceshave been fabricated on the basis of our speci-fication and experience. The scanning processand evaluation of test result can now be done ina few minutes per sheet. We describe the ma-terial test methods and the scanning machine.Measured results of the pre-series niobium willbe compared to older material tests results.



THP014 Progress on Diagnostic Tools for Supercon-ducting High-Gradient CavitiesF. Schlander (DESY), S. Aderhold, E. Elsen,D. Reschke (DESY)Superconducting cavities have long been used inparticle accelerators. The 1.3 GHz cavities de-veloped in the TESLA collaboration will be thebasis of the European XFEL and are the cavityof choice for the International Linear Collider(ILC). The fabrication of the cavities has been op-timised over the past 20 years and will now beapplied in industrial production of the 800 cavi-ties foreseen for the XFEL. The DESY ILC group isdeveloping tools to monitor those aspects of theproduction that affect the gradient of these cav-ities. The main obstacle in achieving a high gra-dient >30 MV/m is the quench induced in sur-face structures in the niobium. Such featuresare explored in an optical inspection of the 9-cell cavity structures and supplemented by mea-surements of the second sound that originatesfrom the phase transition of the liquid helium atthe position of the quench. Oscillating SuperleakTransducers (OST) are used to record the signalof the second sound. The second sound mea-surements are thought to replace the time con-suming direct temperature measurements on theouter cavity surface with a resistor system. Thestatus of the various tools will be described.

THP015 A Review of the 1.3GHz Superconducting9-Cell Cavity Fabrication for DESYJ. Iversen (DESY), R. Bandelmann, G. Kreps,W.-D. Moeller, D. Proch, J.K. Sekutowicz,W. Singer (DESY)Since 1993 DESY ordered 165 1.3GHz 9-cell su-perconducting cavities. The cavities have beendeveloped for TeV-Energy Superconducting Lin-ear Accelerator (TESLA) and are used in the linacof the Free Electron Laser in Hamburg (FLASH).The fabrication of all cavities was done in 9 pro-duction groups at industry. From the beginningthe industrialization was carried out in close col-laboration between DESY and the industry. Fromorder to order the cavity design was optimizedand the fabrication sequences were improved torealize stable and better cavity performance andto safe costs. Now a final cavity design for theEuropean XFEL is defined. We summarize thedevelopment phases and design changes up tothe final XFEL design. An outlook on the near fu-ture production of hundreds of cavities for XFELbased on our experience will be given.



THP016 Field Quality of the Fundamental Mode ina Slotted SRF Cavity for an ERLC.-X. Wang (ANL), R. Nassiri (ANL) Z.C. Liu(PKU/IHIP)Recently a novel 9-cell superconducting radio-frequency (SRF) structure was proposed forhigh-current energy-recovery linac applications[PRST-AB 13, 012001 (2010)]. To provide efficientdamping of the higher-order modes, the conven-tional cylindrical symmetric structure is brokeninto three equal parts to form a slotted cavitystructure. Since the slots cut across the irisesand significantly break the cylindrical symmetryof the accelerating structure close to the beam,the fundamental mode quality may be degraded,thus impacting beam energy spread and per-turbing transverse beam motion as well. In thispresentation, we will quantify the flatness of theaccelerating field across the aperture, and themagnitude of longitudinal and transverse kicksto a beam due to broken symmetry.

THP017 Developing SRF Structures Using AtomicLayer DepositionJ. Norem (ANL), M. Kharitonov, J. Klug,M.J. Pellin, Th. Proslier (ANL) G. Ciovati(JLAB) A.V. Gurevich (NHMFL) J. Zasadzinski(IIT)An effort, centered at Argonne, has started to ex-plore the use of Atomic Layer Deposition (ALD)to study and improve the performance of su-perconducting rf (SRF) accelerating structures.This effort has a number of parts: a survey theproperties of ALD deposited films, a study of lossmechanisms of SRF structures, and a program ofcoating single cell cavities, to begin to optimizethe performance of complete systems. Early re-sults have included improving the performanceof individual structures and, identification ofmagnetic oxides as a loss mechanism in SRF.We describe the program and summarize recentprogress.

THP018 Recent Results of 1.3GHz 9-cell Supercon-ducting Cavities in KEK-STFY. Yamamoto (KEK), H. Hayano, E. Kako,S. Noguchi, M. Satoh, T. Shishido, K. Umem-ori, K. Watanabe (KEK)MHI#10 and #11 cavities are measured in KEK-STF as the s0 plan for ILC. After these verticaltests, they will be sent to J-Lab and tested at leastonce there. Moreover, two new cavities with-out HOM coupler are fabricated and measuredin STF, which are made by two new vendors (HI-TACHI and TOSHIBA). As the international col-



laboration, one cavity from IHEP in Beijing willbe sent to KEK, optical inspected, high pres-sure rinsed and vertical tested. Although MHI#8cavity for S1-Global reached 38MV/m, it couldnot achieve ILC specification (35MV/m, 0.8x109)due to the heavy field emission. To overcomethis problem, the various tests were done in thestage of the surface treatment. For example, theEP parameters and the rinsing procedure werechanged. In this report, the recent results of thevertical tests including the surface treatment inKEK-STF will be presented in detail.

THP019 Defect-Induced Local Heating of Supercon-ducting Cavity SurfaceY. Morozumi (KEK)The limitation of the accelerating gradient is oneof the current major issues with ILC supercon-ducting RF accelerator structures. Field emis-sion and thermal breakdown due to surface im-perfections are supposed to limit the gradientperformance. Profilometry-based realistic high-fidelity modeling of field enhancement will bepresented. Surface defects are suspects respon-sible for thermal breakdown of superconductingRF cavities. Evaluation of local heating at surfacedefects and analysis of thermal behavior will bediscussed in comparison with experimental evi-dences.

THP020 Simulation of Electropolishing of Super-conducting CavitiesY. Morozumi (KEK)Electropolishing is supposed to be indispensablefor high gradient performance of superconduct-ing accelerator structures. Flow of electrolyticfluid and its reaction with surfaces are, however,difficult to measure. Simulation of electropolish-ing visualizes polishing effect over the entire sur-face and gives a guide to improved design of elec-tropolishing system.

THP021 Higher Mode Heating Analysis for Super-conducting ILC LinacsK.L.F. Bane (SLAC), C. Adolphsen, C.D. Nan-tista (SLAC)The superconducting cavities and interconnectsin the 12 km long linacs of the International Lin-ear Collider (ILC) are designed to operate at 2Kwhere cooling costs are very expensive. Thus itis important to ensure that any additional cryo-genic heat loads are small in comparison to thosefrom static losses and the fundamental 1.3 GHzaccelerator mode. One potential heat source isthe higher order modes (HOM) excited by the



beam. Such modes will be damped by spe-cially designed HOM couplers that are attachedto the cavities (for trapped modes), and by 70Kceramic dampers that are located in each ofthe eight or nine cavity cryomodules (for prop-agating modes). Brute force calculations of thehigher frequency, non-trapped modes excited ina string of cryomodules is limited by computingcapacity. We present, instead, an approach thatcombines scattering matrix and wakefield calcu-lations to study the effectiveness of the dampersin limiting the heat deposited in the 2K cryogenicsystem.

THP022 Design Optimisation of the EURISOLDriver Low-beta CavitiesY. Ma (CIAE) A. Facco, F. Scarpa (INFN/LNL)The low-beta section of the EURISOL driverlinac is based on 176 MHz superconducting half-wave resonators (HWR) with beta=0.09 and 0.16.These cavities are an evolution of the 352 MHzones, previously developed in the same frame-work, having similar dimensions and compo-nents except for their length and rf frequency.They are characterized by a double wall, all nio-bium structure with light weight, good mechan-ical stability and a side tuner cooled by thermalconduction. The new 176 MHz Half-wave cav-ities design includes a removable tuner, whichallows to improve tuning range, mechanical sta-bility and accessibility to the cavity interior. Abeta=0.13 cavity, which could be suitable forlinacs like the SARAF one, was also designedwith the same concepts. Design characteristicsand expected performance will be presented anddiscussed.

THP023 Developments and Test of a 700 MHz Proto-typical Cryomodule for the MYRRHA ADSProton Linear AcceleratorF.B. Bouly (IPN), J.-L. Biarrotte, P. Blache,S. Bousson, C. Commeaux, C. Joly,J. Lesrel, E. Rampnoux (IPN) A. Bosotti,P.M. Michelato, R. Paparella, P. Pierini, D. Ser-tore (INFN/LASA)Accelerator Driven systems (ADS) are being con-sidered for their potential use in the transmu-tation of nuclear waste. Because of the inducedthermal stress to the subcritical core, the high-power proton LINAC will have to fulfill stringentreliability requirements and to minimize thenumber of unwanted beam trips per operationcycle. It is forseen to build an ADS demonstrator(MYRRHA) in Mol (Belgium). Such a device willbe piloted by a 600 MeV / 4mA superconducting



linac. IPN Orsay and INFN Milano are in chargeof the realisation and tests of a prototypical cry-omodule for the high energy section of the accel-erator, equipped with a 5-cell superconductingcavity. Developed at INFN, this RF cryogenicaccelerating device is tested for the first time atIPN. We will describe the status of the R&D ac-tivities on this device. The first low power testsof the 5-cell superconducting cavity in its proto-typical cryomodule will be reviewed. Those testsaim to evaluate the cavity performances afterinstallation in the module (16MV/m in verticaltest) but also to measure the tuning systems be-haviors in view of reliability considerations for’fast fault-recovery scenarios’.

THP024 Design Sensitivities of the Superconduct-ing Parallel-Bar CavityS.U. De Silva (ODU), J.R. Delayen (ODU)The superconducting parallel-bar cavity hasproperties that makes it attractive as a deflect-ing or crabbing rf structure. For example it isunder consideration as an rf separator for theJefferson Lab 12 GeV upgrade and as a crabbingstructure for a possible LHC luminosity upgrade.In order to maintain the purity of the deflectingmode and avoid mixing with the near accelerat-ing mode caused by geometrical imperfection, aminimum frequency separation is needed whichdepends on the expected deviations from perfectsymmetry. We have done an extensive analysis ofthe impact of several geometrical imperfectionson the properties of the parallel-bar cavities andthe effects on the beam, and present the resultsin this paper.

THP026 Superconducting RF Cavity ProductionProcessing and Testing at FermilabC.M. Ginsburg (Fermilab), M.S. Champion,J.P. Ozelis, A.M. Rowe (Fermilab) M.P. Kelly(ANL)The superconducting RF (SRF) cavity productionprogram at Fermilab supports 9-cell 1.3 GHzcavity qualification and preparation for assem-bling cavities into cryomodules, in support ofProject X, ILC, or other future projects. Cavityqualification includes cavity inspection, surfaceprocessing, clean assembly, and one or morecryogenic qualification tests which typically in-clude performance diagnostics. The overall goalsof the program, facilities and accomplishmentsare described.



THP027 Overview of the Fermilab SuperconductingRF Research and Development ProgramM.S. Champion (Fermilab), L. Cooley,C.M. Ginsburg, V.P. Yakovlev (Fermilab)The superconducting RF (SRF) R&D program atFermilab includes cavity design and develop-ment, and fundamental SRF materials studies insupport of Project X, ILC, or other future projects.Five new cavities are under development forProject X; these single-spoke 325 MHz and el-liptical 650 MHz cavities span the beta range0.12 to 0.9. The SRF materials R&D is focusedon studying fundamental limitations in SRF cav-ity performance, as well as repair and inspectiontechniques used for understanding current man-ufacturing or surface processing limitations. Anoverview of the Fermilab SRF R&D program isdescribed.

THP028 Recent Development of RF Measurementsand Tuning of the Accelerating Cavities atFNALT.N. Khabiboulline (Fermilab)Several types of accelerating structures are un-der development at FNAL for a several projectsas ILC, ProjectX and HINS. Some cavities al-ready manufactured and some are under devel-opment. RF quality control measurements, fre-quency and field flatness tuning are necessaryduring and after production for achieving cav-ity design parameters. Most superconducting RFcavities have integrated High Order Mode cou-plers for damping of dangerous modes for sta-ble beam acceleration. HOM coupler notch fre-quency measurements, tuning and calculationsare described. Technique for a measurement ofthe cavity cell centers based on bead pull in op-erating frequency is reported. This non-contacttechnique allows to measure cavity alignment ofthe dressed cavities. Experience of tuning of 1.3GHz elliptical superconducting cavity in new au-tomated Cavity Tuning Machine also reported.

THP029 Operating Experience with CC2 at Fermi-lab’s SRF Beam Test FacilityE.R. Harms (Fermilab), J. Branlard, G.I. Can-celo, K. Carlson, B. Chase, E. Culler-ton, A. Hocker, P.W. Joireman, T. Kubicki,J.R. Leibfritz, A. Martinez, M.W. McGee,Y.M. Pischalnikov, J. Reid, W. Schappert,K.R. Treptow, V. Tupikov, P. Varghese,T.J. Zmuda (Fermilab)Capture Cavity II is the first operational compo-nent at the SRF Beam Test Facility now underconstruction at Fermilab. This 9-cell 1.3 GHz



cavity, previously operated in another venue onthe Fermilab site, was transported to this facilityin early 2009. We will summarize its transportand operation in its new (permanent) homecompared to previous performance and alsopresent results of studies, particularly Low LevelRF, microphonics/vibration, and Lorentz forcede-tuning compensation that have been recentlycarried out with it.

THP030 A 325 MHz SRF Spoke Cavity Tuner TestsY.M. Pischalnikov (Fermilab), E. Borissov,T.N. Khabiboulline, R.V. Pilipenko, L. Ristori,W. Schappert (Fermilab)Fermilab is developing 325 MHz SRF spoke cav-ities for the proposed ProjectX. A compact fast/slow tuner has been developed to compensatemicrophonics and Lorentz force detuning. Themodified tuner design and results of 4K tests ofthe first prototype are presented.

THP031 First High Gradient Test Results of a 325MHz Superconducting Single Spoke Res-onator with Helium Vessel at FermilabR.C. Webber (Fermilab)The Fermilab High Intensity Neutrino Source(HINS) program is developing 325 MHz super-conducting spoke resonator accelerating cavi-ties. In this paper we present the first test resultsof the beta=0.22 single-spoke cavity in a heliumvessel. The tests, performed in the newly commi-sioned superconducting spoke cavity test facility,include both CW testing to full-gradient with ahigh Qext drive coupler and pulsed high-powertesting with an input coupler designed for 25 mAbeam current.

THP032 Status of the EP Simulations and Facilitiesfor the SPLS. Calatroni (CERN), L.M.A. Ferreira,M. Leitao Macatrao, Y.L. Withofs (CERN)CERN is assembling a new vertical electropolish-ing facility in order to process several niobiumcavities of beta 1 and beta 0.65 in the contextof the SPL R&D programme. To provide safeoperating conditions when handling chemicalsor processing cavities specific safety equipmentis foreseen, while the materials from the dif-ferent equipments must be compatible with thechemicals in contact within the required workingtemperature and pressure. Macro properties offluid dynamics like Reynolds number and ther-modynamics linked to the process dissipatedpower are taken into account to dimension themain pump and heat exchanger. Electrochemi-



cal simulations are being used in order to definethe optimal cathode geometry to process thecavities in a vertical position.

THP033 Superconducting Sputtered Nb/Cu QWRfor the HIE-ISOLDE Project at CERNS. Calatroni (CERN), A. D’Elia, M.A. Fraser,G. Lanza, M. Pasini, M. Therasse (CERN)For the foreseen upgrade of the ISOLDE complexa new superconducting LINAC based on sput-tered Nb/Cu Quarter Wave Resonators (QWRs)of two different beta families is planned to beinstalled in the next three to five years. A proto-type cavity of the higher beta family is currentlybeing developed. In this paper we will discussthe latest developments on the sputtering tech-nique for this kind of cavity geometry. First coldRF measurements will be reported.

THP034 Main LINAC Superconducting Cavity De-sign for Cornell’s ERLN.R.A. Valles (CLASSE), M. Liepe (CLASSE)We discuss optimization methods used to de-sign the superconducting cavities for Cornell’shigh beam current (100 mA) Energy RecoveryLinac project. The determination of a "beambreak up" parameter is discussed, and used tofacilitate the optimization process. Cavity per-formance subject to machining errors are sim-ulated, and it is found that increasing the widthof the HOM passbands mitigates the creationof dangerous higher order modes that limit thebeam current. Finally, we introduce a new HOMabsorber design and material, and show that thedesign meets the requirements of supporting 100mA current through the main linac.

THP035 Prototyping Activities of Low-beta SRF Cav-ity for the PEFP Proton Linac ExtensionH.S. Kim (KAERI), Y.-S. Cho, H.-J. Kwon(KAERI)A superconducting RF cavity with a geometricalbeta of 0.42 and a resonant frequency of 700 MHzhas been under consideration for an extensionprogram of Proton Engineering Frontier Project(PEFP) to accelerate the proton beam above 100MeV. A five-cell prototype was fabricated andtested to confirm the fabrication procedure andto check the RF and mechanical properties. HighRRR niobium sheets (RRR > 250) were used forthe cavity material, whereas reactor grade nio-bium and NbTi were used for the beam piperegion and the flange, respectively. Double-ringstiffening structure was adopted to reduce theLorentz force detuning effect. For the vertical



test of the prototype cavity, a cryostat with op-erating temperature of 4.2 K was designed andfabricated. The cryostat was thermally insulatedwith 40 layers of MLI and the vacuum jacket andequipped with temperature monitors and liquidlevel sensors. The RF system for driving the cav-ity is based on PLL to track the resonance con-dition. The status of the prototype developmentand the vertical test results will be presented inthis paper.

THP036 Updates on Sc Cavity InspectionH. Tongu (Kyoto ICR), M. Ichikawa,Y. Iwashita (Kyoto ICR) H. Hayano, K. Watan-abe, Y. Yamamoto (KEK)Optical inspections on superconducting cavi-ties seem to become familiar to those who areinvolved in the cavity fabrications. Further im-provements on the Kyoto Camera have beencarried out these years together with further in-vestigation technique developments, such ashigh density T-map or eddy current scan. Im-provements on Kyoto Camera includes changeof EL sheets to LEDs, which raised the brightness10 times and the lifetime very long as knownwell. The resolution was also increased. The highdensity T-map will help to locate a hot spot dur-ing the vertical tests and the eddy current scanwill be useful for screening of bare Nb sheetswith possible defects. These progresses will bereported.

THP037 High-Gradient Test of a 3 GHz Single-CellCavityS. Verdú-Andrés (TERA), U. Amaldi,R. Bonomi, A. Degiovanni, M. Garlasché(TERA) A. Garonna (EPFL) C. Mellace,P. Pearce (A.D.A.M. S.A.) S. Verdú-AndrésR. Wegner (CERN)Proton and carbon ion beams present advanta-geous depth-dose distributions with respect toX-rays. Carbon ions allow a better control of "ra-dioresistant" tumours due to their higher biolog-ical response. For deep-seated tumours protonand carbon ion beams of some nA and energiesof about 200 MeV and 400 MeV/u respectively areneeded. For these applications TERA proposedthe "cyclinac": a high-frequency linac whichboosts the hadrons accelerated by a cyclotron.The dimensions of the complex can be reducedif higher accelerating gradients are achieved inthe linac. To test the maximum achievable fields,a 3 GHz cavity has been built by TERA. The 19mm-long cell is foreseen to be excited at 200 Hzby 3 us RF pulses and should reach a 40 MV/m



accelerating gradient, which corresponds to apeak surface electric field Es of 260 MV/m. In afirst high-power test performed at CTF3 the cellwas operated at 50 Hz with a maximum peakpower of 1 MW. The maximum Es achieved wasabove 350 MV/m. The breakdown rate at thesefield values was around 10-1 bpp/m. The max-imum value of the modified Poynting vector isclose to the best values achieved by high gradientstructures at 12 and 30 GHz.

THP038 Ultimate-Gradient SRF Test Cavity andLoss Measurements in Ultra-Pure SapphireP.M. McIntyre (Texas A&M University),N. Pogue, A. Sattarov (Texas A&M Univer-sity) C.E. Reece (JLAB)A 1.3 GHz superconducting test cavity is beingdeveloped to test wafer samples of advanced SRFmaterials with surface fields at or beyond the NbBCS limit. The mushroom-shaped Nb cavity isdielectric-loaded, with a hemisphere of high-purity sapphire located just above a detachableend flange. Wafer samples are mounted on theend flange. The cavity is operated in the TE011mode, so no currents flow from the end flangeto the side walls. Fields are concentrated on thewafer sample so that the peak surface field thereis 4 times greater than anywhere else on the cav-ity walls. The loss tangent of ultrapure sapphireis critical to the performance of the test cavity.A separate first experiment has been conductedin a special 1.8 GHz cavity to measure this losstangent in L band as a function of temperaturefor the first time. Results of the measurementand the final design of the ultimate-gradient testcavity will be presented.

THP039 Superconducting Coaxial Resonator Devel-opment for Ion Linacs at Michigan StateUniversityW. Hartung (NSCL), S. Bricker, C. Compton,K. Elliott, M. Hodek, J.P. Holzbauer, M.J. John-son, O.K. Kester, F. Marti, S.J. Miller, D. Nor-ton, J. Popielarski, L. Popielarski, J. Wlodar-czak, R.C. York (NSCL) A. Facco (INFN/LNL)E.N. Zaplatin (FZJ)Niobium quarter-wave resonators (QWRs) andhalf-wave resonators (HWRs) are being de-veloped at Michigan State University for twoprojects: a 3 MeV per nucleon superconductinglinac for re-acceleration of exotic ions (ReA3, un-der construction, requiring 15 resonators), anda 200 MeV per nucleon driver linac for the Facil-ity for Rare Isotope Beams (FRIB, under design,requiring 344 resonators). The QWRs (80.5 MHz,



optimum beta = 0.041 and 0.085) are required forboth ReA3 and FRIB. Both include stiffening ele-ments and frictional dampers. Nine beta = 0.041QWRs have been fabricated; seven of them havebeen Dewar tested successfully with a heliumvessel for use in ReA3. Production and testingof ten beta = 0.085 QWRs is in progress. TheHWRs (322 MHz, optimum beta = 0.29 and 0.53,required for FRIB) are designed for mechanicalstiffness and low peak surface magnetic field. Aprototype beta = 0.53 HWR has been fabricated,and a prototype beta = 0.29 HWR is planned.This paper will cover the RF and mechanical re-quirements, the resonator and vessel design, andDewar testing of production resonators.

THP040 Superconducting Resonator and Cryomod-ule Production for Ion Linacs at MichiganState UniversityC. Compton (NSCL), J. Bierwagen, S. Bricker,J. DeLauter, K. Elliott, W. Hartung, M. Hodek,J.P. Holzbauer, M.J. Johnson, O.K. Kester,F. Marti, D. R. Miller, S.J. Miller, D. Norton,J. Popielarski, L. Popielarski, N. Verhanovitz,K. Witgen, J. Wlodarczak, R.C. York (NSCL)Superconducting quarter-wave resonators, half-wave resonators, and cryomodules are beingprototyped and fabricated at Michigan StateUniversity (MSU) for two ion linac projects.The 3 MeV per nucleon reaccelerator project(ReA3) is under construction as an upgrade toMSU’s nuclear physics research program. ReA3requires 15 production resonators, housed inthree cryostats, with commissioning to begin in2010. In parallel, MSU is engaged in a futurelaboratory upgrade, the Facility for Rare IsotopeBeams (FRIB). FRIB requires a 200 MeV per nu-cleon driver linac, which includes 344 resonators(four different betas) housed in 52 cryomodules.FRIB development work is underway, with theprototyping of a FRIB cryomodule planned forearly 2011. In addition, the acquisition strategyfor FRIB resonators and cryomodules is beingfinalized, and the technology transfer programis being initiated. The status of the resonatorand cryomodule production effort will be pre-sented in this paper, including an overview ofthe acquisition strategy for FRIB.



THP041 An Update on the Study of High-GradientElliptical SRF Cavities at 805 MHz for Pro-ton and Other ApplicationsT. Tajima (LANL), G.V. Eremeev, W.B. Haynes,F.L. Krawczyk, R.J. Roybal, J.D. Sedillo (LANL)W.A. Clemens, P. Kneisel, K. Macha, R. Manus,R.A. Rimmer, L. Turlington (JLAB)An update on the study of 805 MHz elliptical SRFcavities that have been optimized for high gradi-ent will be presented. An optimized cell shape,which is still appropriate for easy high pressurewater rinsing, has been designed with the ratiosof peak magnetic and electric fields to acceler-ating gradient being 3.75 mT/(MV/m) and 1.82,respectively. A total of 3 single-cell cavities havebeen fabricated and tested with various condi-tions. In addition, a 6-cell cavity design has beencompleted including multipacting simulations.

THP042 Studies on Superconducting Thin Films forSRF ApplicationsT. Tajima (LANL), G.V. Eremeev, M.A. Madrid(LANL) I.E. Campisi (ORNL) V.A. Dolga-shev, J. Guo, D.W. Martin, S.G. Tantawi,C. Yoneda (SLAC) B. Moeckly (STI) M.J. Pellin,Th. Proslier (ANL)In order to overcome the theoretical limit of ∼200mT peak surface magnetic field for niobium SRFcavities, an idea of coating multi-layer thin filmsuperconductors separated with thin dielectriclayers has been suggested. We are testing MgB2,NbN and NbC as candidates for the realization ofthis idea. The results of surface characterization,Auger depth profile, DC magnetization measure-ments with SQUID, low- and high-field mea-surements with a TE013-like mode copper cavitycoupled with a 11.4 GHz short-pulse Klystronwill be presented.

THP043 1.3GHz Cavity Development at TRIUMFR.E. Laxdal (TRIUMF), C.D. Beard, P. Kolb,V. Zvyagintsev (TRIUMF) D. Longuevergne(UBC & TRIUMF)TRIUMF has embarked on a 1.3GHz develop-ment program to support the construction of a50MeV 10mA e-Linac for the production of ra-dioactive ion beams through photo-fission. Twosingle cell bulk niobium cavities have been pro-duced in Canadian Industry. A seven-cell cav-ity in copper is being fabricated both as a man-ufacturing model and to test higher order modecalculations. Electro-magnetic and mechanicalmodels of a multi-cell cavity are being done tooptimize the final design for high intensity ac-celeration. The 1.3GHz cavity development pro-



gram will be presented.

THP044 RF Cavity Performance in the ISAC-II Su-perconducting Heavy Ion LinacD. Longuevergne (UBC & TRIUMF)C.D. Beard, A. Grassellino, P. Kolb, R.E. Lax-dal, V. Zvyagintsev (TRIUMF)The ISAC-II superconducting linac consistsof forty quarter wave bulk niobium cavities.There are eight and twelve 106MHz cavities atbeta=5.7% and 7.1% respectively and twentycavities at 141MHz at beta=11%. The first twentyhave been operating since 2006 (Phase I) andthe remainder have been installed for first com-missioning in April 2010 (Phase II). Cavity per-formance statistics of the 2006 cavities havebeen accumulated to look for signs of system-atic degradation in performance. These will bepresented. In addition single cavity test resultsand in situ characterization tests of the first op-eration of the Phase II cavities will be presented.

THP046 CSNS Linac RF System Design and R&DProgressJ. Li (IHEP Beijing), J.M. Qiao, X.A. Xu, Y. Yao,Z.H. Zhang, W. Zhou (IHEP Beijing) Z.C. Mu(Institute of High Energy Physics, CAS)China Spallation Neutron Source (CSNS) isdetermined to be constructed in Dongguan,Guangdong province of south China. Now itsdesign and R&D are in progress in IHEP, Bei-jing. The 324 MHz rf linac is designed withbeam energy of 81 MeV and a peak current of30 mA. In the klystron gallery, five klystron powersources will be used to power the RFQ and thefour DTL tanks, and three solid state RF ampli-fiers will drive two MEBT bunchers and a LRBTdebuncher. Now we have already made someprogress with some key technologies for linac RFsystem. The digital low level RF control proto-type was already developed and successfully ap-plied in beam commissioning of the ADS (Accel-erator Driven Sub-critical system) 3.5MeV RFQaccelerator at peak beam 44.5mA, beam duty7.15%. A proposed new type of power supply,100Hz ac series resonance high voltage powersupply, passed acceptance test and a satisfactorytest results was obtained. R&D of crowbar andmodulator has gotten preliminary performancetest data.



THP047 Status of the Oak Ridge Spallation NeutronSource (SNS) RF SystemsT.W. Hardek (ORNL), M.T. Crofford,Y.W. Kang, S.W. Lee, M.F. Piller, A.V. Vas-sioutchenko (ORNL) M.E. Middendorf (ORNLRAD)The SNS has been delivering production neu-trons for four years. First beam was deliveredto the neutron target at the end of April 2006.On September 18, 2009 SNS officially reached1 megawatt of beam on target marking theachievement of a decades-old dream of deliver-ing a mega-watt class pulsed spallation source inthe U.S. The present effort is aimed at routinelydelivering 1 megawatt of beam and graduallyincreasing the intensity to the 1.4 megawatt de-sign level. The RF systems have performed wellsince initial installation. This paper provides areview of the SNS RF Systems, an overview ofthe performance of the various components anda more detailed review of the RF related issuesaddressed over the past several years.

THP048 Solid-State Upgrade to the SNS MEBT RFPower AmplifiersM.E. Middendorf (ORNL RAD) M.E. Clem-mer, T.W. Hardek (ORNL)The original SNS baseline installation includedsix 20kWpk vacuum tube power amplifiers (fouronline amplifiers and two ready spares, manu-ally interchangeable) to drive the four rebunchercavities that are part of the Medium Energy BeamTransport (MEBT) structure. We are in the pro-cess of replacing the six vacuum tube ampli-fiers with five commercially-available 25kWpksolid-state amplifiers that will connect to the re-buncher cavities through a remotely-operated4+1 switching matrix. We report progress to date.

THP049 Latest IGBT Gate Driver for the HVCM atSNSD.J. Solley (ORNL), D.E. Anderson, M. Wezen-sky (ORNL) C. Burkhart, M.A. Kemp,M.N. Nguyen (SLAC)The SNS at ORNL has been operational since2006, during which time beam power to targethas been ramping. As of September 2009, a sus-tainable 1 MW was achieved, continuing to makeSNS the highest energy pulsed neutron sourceavailable for scientific research worldwide. Hav-ing achieved the design energy, the shift in focusis now towards increasing the availability for re-searchers using the facility. For example, a 25,000hour MTBF together with a four hour MTTRgoal for the High Voltage Converter Modulators



(HVCMs) translates into a 99.98% availabilityfigure. This ambitious goal requires careful en-gineering of system components, the ability toactively monitor and respond to fault conditionsand employment of redundancy wherever pos-sible. This paper outlines the features of thelatest IGBT gate drivers that switch the 1200 A,3300/4500V IGBT modules used in the modula-tor. The paper goes on to discuss how the signalsmonitored within each driver can be processedby a central controller to optimize and protectthe power stage in a particularly hostile envi-ronment. Examples of how the new drivers canimprove system availability and improve faultresponse will also be reported

THP050 Investigation on Mode Separation Methodsand Accuracy of Field Measurement in RFQStructures with 3-D EM SimulationK.R. Shin (ORNL), Y.W. Kang, S.-H. Kim(ORNL) A.E. Fathy (University of Tennessee)In radio frequency quadrupole (RFQ) structures,the fundamental quadrupole mode is used forfocusing and acceleration of ion particles. Thefields are maintained to have negligible interfer-ence with other unwanted modes of the struc-ture using mode suppressors of different typesespecially in vane type RFQ that have certainadvantages and disadvantages. The field distri-bution on the beam axis is usually measured andreferenced using multiple loop-type magneticprobe antennas on the wall along the structure.Since the structures are equipped with many slugtuners on the outer wall for correction of fields,the tuner-probe interference can be a concern.In order to investigate the mode separation prop-erties of the commonly used mode suppressorsand the accuracies in field distribution with re-spect to localized mechanical imperfections dueto the tuners, a systematic 3D simulation hasbeen carried out using a full-scale model of theSNS RFQ.

THP051 Retrospective on Fundamental Power Cou-plers for the Spallation Neutron Source atOak RidgeM. Stirbet (JLAB)As of September 2009 a sustainable 1 MW inbeam power was achieved at Oak Ridge, con-tinuing to make SNS the highest energy-pulsedneutron source available for scientific researchworldwide. This paper evaluates the FPCs de-signed and built at JLAB for the SNS project, em-phasizing their performance and related issuesaddressed during prototyping, qualification on



the RF power test stand at room temperature,superconducting cavity commissioning and suc-cessful but challenging operation with beam formore than 5 years.

THP052 RF Power Generation in LINAC4O. Brunner (CERN), J.N. Schwerg (CERN)Linac4 is a linear accelerator for negative Hydro-gen ions (H-) which will replace the old Linac2as linear injector for the CERN accelerators. Itshigher energy of 160 MeV will give increasedbeam intensity in the downstream machines.Linac4 is about 100 m long, normal-conducting,and will be housed in a tunnel about 12 m belowground. The Linac4 tunnel will be connected tothe existing chain of accelerators and can be ex-tended to the new injection chain. The high RFpower for the Linac4 accelerating structures willbe generated by thirteen 1.3 MW klystrons, pre-viously used for the CERN LEP accelerator, andsix new 2.8 MW klystrons of all operating at a fre-quency of 352.2 MHz. The integration of the RFpower system in the building is presented. Thetechnical specifications and the performance ofthe various high-power elements are discussed,with emphasis on the required retuning of theLEP klystrons. The power distribution system in-cluding the power splitting requirements are alsodescribed.

THP053 High Power RF for TRIUMF Injector Cry-omodule and ElinacA.K. Mitra (TRIUMF), S.R. Koscielniak,R.E. Laxdal (TRIUMF)A 500 kW electron linear accelerator is beingproposed at TRIUMF for radioactive ion beamproduction to support existing rare isotope facil-ity. Present design consists of 100 keV thermionicgun, a normal conducting buncher, an injectormodule and main linac modules. The designenergy is 50 MeV with 10 mA beam current. Thelinac will operate in cw mode using 1.3 GHzsuperconducting technology. The injector cry-omodule (ICM), uses a nine-cell TESLA typecavity operating at 2 degree Kelvin. The frontend of the ICM has a room temperature buncherand also has two superconducting capture cavi-ties which are housed in the same cryomodule asthe accelerating multi-cell cavity. Solid state am-plifiers are proposed to be used for the buncherand the capture cavities. A 30 kW 1.3 GHz IOT,operating at cw will be used to drive the nine-cellcavity of the ICM. The rf power will be dividedinto two equal parts and fed to two TTF III typecouplers. The same couplers are intended to be



used for the remaining accelerator cavities of thee-linac. The e-linac is being proposed to be builtin stages. High power Klystrons are to be used toprovide rf power to the accelerating cavities.

THP054 A Diplexer to Operate Two Cavity Eigen-modes in ParallelA. Arnold (FZD)To fulfil the demand of future high power andhigh luminosity FEL and Storage Ring sources, anintensive electron beam with short bunch length,small emittance and large bunch charge is re-quired. Laser driven superconducting radio fre-quency (SRF) photocathode guns in combina-tion with SRF LINACs appear to be the best so-lution. First long term operation was demon-strated at the FZD*. In difference to the nor-mal conducting guns, the application of staticmagnetic fields is not possible. Instead, the useof a transverse electric (TE) mode in parallel tothe accelerating mode was proposed. Numer-ical simulations have shown that such RF fo-cusing can be applied to compensate emittancegrowth**. This contribution will introduce a pos-sibility to use the existing coaxial RF coupler ofTESLA like cavities, as RF power input for TEmodes in parallel. An additional coupler compo-nent outside the module satisfies the job of com-bining two frequencies from different sources toone load. Thus, it corresponds to the workingprinciple of a high power RF diplexer. Based onthe 3 1/2 cell FZD SRF gun, a concrete techni-cal implementation and results of its operationat the cold cavity will be presented.

THP055 Multipactor Simulations of the SPL PowerCouplerG. Burt (Cockcroft Institute, Lancaster Uni-versity), A.C. Dexter (Cockcroft Institute, Lan-caster University) R. Calaga (BNL) E. Mon-tesinos (CERN)Multipactor is a limiting factor in many RF powercouplers. The SPL coupler is proposed to havea conical matching section between the win-dow and the coaxial section however this sectionmust be checked for multipactor. Multipactorsimulations of the coupler up to a few MW’s ofpower were performed using a variety of differentcodes and the results were compared. Simula-tions were performed in the conical and straightcoaxial sections.



THP056 Development of a 300-kV Solid State PulsedVoltage Supply for an ANL XFELO Injector*A.R. Cours (ANL), G. Trento (ANL)A solid state Marx-based pulsed voltage supplyis being developed at Argonne National Labora-tory (ANL) with the capability of providing 300-kV pulses with 0.5-µs rise time, 1-µs fall time, 2-µs pulse flat top, and up to 10-Hz repetition rate.The supply is designed to operate a direct current(DC) thermionic prototype gun producing ∼ 0.1-µm beam emittance, a part of the ANL x-ray free-electron laser oscillator (XFELO) injector feasi-bility studies. The pulsed supply utilizes isolatedgate bipolar transistor (IGBT) devices. Stageswitching allows this supply to quickly charge the200-pF gun capacitance and maintain 300-mAgun current during the pulse flat top. A secondstring of IGBT switches charges the stage capac-itors and acts as a ’crowbar’ to quickly removehigh voltage from the gun at the pulse’s fall timeor during load arcing. We present an overview ofthe design and development of the XFELO injec-tor DC gun pulsed power supply.

THP057 A New Fast Tuning System for ATLAS Inten-sity Upgrade CryomoduleM.P. Kelly (ANL), S.M. Gerbick, M. Kedzie,P.N. Ostroumov, S.I. Sharamentov (ANL)An upgrade project is underway at the ATLAS su-perconducting RF (SRF) heavy-ion linac at Ar-gonne National Laboratory to dramatically in-crease the intensity of both stable beams andshort-lived isotopes from the CARIBU fissionsource. The upgrade includes a new normalconducting RFQ injector and an SRF cryomod-ule consisting of seven high-performance 72.75MHz quarter-wave cavities optimized for ionswith velocity of 0.077c. The module will de-liver more than 17.5 MV of accelerating poten-tial over 5 meters and replace three existingsplit-ring cryomodules. Key to this performancewill be a new cavity fast tuning system thatreplaces the voltage-controlled-reactance (VCX)fast tuner. The recently completed ATLAS up-grade cryomodule installed in June 2009 has areal estate gradient of 14.5 MV over 4.6 meters,the highest for any low-beta cryomodule, how-ever, performance is 40% less than could beachieved without the VCX. As such, the VCX isbeing replaced with a high-power rf coupler anda fast piezoelectric-based tuner to be used to-gether to control the cavity phase. Cold test re-sults of a prototype power coupler and piezo-tuner are presented here.



THP058 Power Supply System for Klystron in J-PARC LinacM. Kawamura (KEK), Y. Fukui, F. Naito (KEK)E. Chishiro, H. Suzuki, M. Yamazaki (JAEA)K. Hasegawa, S. Shinozaki (JAEA/J-PARC)This report will describe the present status ofthe power supply systems (PS systems) for theklystrons in the J-PARC (Japan Proton Acceler-ator Research Complex) linac. The technicalspecification, the operating experience, and theupgrade plan, of the PS systems will be presentedin this report. Now the energy of the J-PARC linacis 181MeV, and the linac includes twenty 324MHzklystrons. In 2012, the energy will be upgradedto 400MeV, and the linac will include twenty324MHz klystrons and twenty-five 972MHzklystrons. The klystrons are the modulating-anode types. The PS systems include the Highvoltage DC power supplies (DCPSs) and theanode-modulators. One DCPS drives one orfour klystrons, and one anode-modulator drivesone klystron.

THP060 X-band Pulse Compression System usingOne Channel Circular Polarized TravelingWave Delay LineM. Yoshida (KEK), S. Fukuda, Y. Higashi,T. Higo, N.K. Kudo, S. Matsumoto, H. Mat-sushita (KEK) S. Kazakov (Fermilab)The X-band pulse compression system has beendeveloped for the high gradient experiment ofthe accelerating structure in the new X-band testfacility (Nextef). The one channel circular polar-ized traveling wave delay line was selected to ob-tain the higher RF compression efficiency underlimited delay line length and the easier operationthan the cavity chain type. This delay line of thecircular waveguide is also frequently used for theC-band feed line from the modulator floor to theaccelerator test floor. Thus the delay line is tiltedand has the limited length of around 20m. It isdesigned to obtain the three times compressedpower which has the pulse duration of 150 ns.Further we also proceed the upgrade plan usingthe TE21 mode to double the pulse duration. Inthis paper, the design overview of this pulse com-pression system and the RF components includ-ing the mode launcher and the TE11-TE21 reflec-tor will be presented.



THP061 Towards a Modulator for the XFEL RF Sta-tions: Test Results of the Prototype fromThomsonH. Leich (DESY Zeuthen), U. Gensch,M. Grimberg, L. Jachmann, W. Koehler,M. Penno, R.W. Wenndorff (DESY Zeuthen)S. Choroba, H.-J. Eckoldt, T. Grevsmuehl(DESY)The European XFEL, an X-ray free electron laser,is planned as an European project with a strongconnection to the DESY research center in Ham-burg. Construction started in summer 2007 andcommissioning will begin in 2014. The LINACof the XFEL will incorporate 27 RF stations tosupply the RF power required by the super-conducting cavities. In order to generate thispower (10MW at 1.3GHz) HV pulse modulatorsare required. Each modulator has to supply12kV pulses at 1.6kA for 1.7ms pulse durationand at 10Hz nominal repetition rate. The rep-etition rate can be increased to 30Hz keepingthe average power of the 10Hz operation. Al-though experience exists for FLASH with mod-ulators constructed and built by one companytwo additional companies have been selectedand contracted to design and to build additionalprototypes of modulators according to the XFELrequirements. A test stand setup has been pre-pared at DESY, Zeuthen Site, in order to test andto operate these protoypes under similar condi-tions as at the XFEL. The presentation describesthe Modulator Test Facility at DESY (ZeuthenSite) and presents and discusses test results ofthe modulator prototype from Thomson Multi-media.

THP062 Upgrade of the 1.3GHz RF System at FLASHT. Grevsmuehl (DESY), S. Choroba, F. Eints,T. Froelich, V.V. Katalev, K. Machau, P. Moro-zov, R. Wagner, V. Zhemanov (DESY)The FLASH RF system consists of several RF sta-tions, which provide RF power up to 10MW at1.3GHz, 1.3ms and 10Hz repetition rate, each, forthe superconducting cavities and the RF gun ofthe FLASH linear accelerator. During the last up-grade of the FLASH facility several modificationshave been made also to the RF system. The old-est RF stations were constructed and manufac-tured by FNAL more than 15 years ago and havebeen replaced. Since one additional supercon-ducting accelerator module has been added andone superconducting module and the RF gunhave been replaced, modification and rearrange-ment of the RF waveguide distributions were re-quired. An XFEL type waveguide distribution for



the new accelerator module ACC7 and a distri-bution without individual phase shifters for theexchanged module ACC1 have been installed. Anew waveguide distribution for the RF gun al-lows phase tuning by changing the gas pressurein the waveguides. It will also allow supply theRF gun by a 10MW multi beam klystron insteadof the still used 5MW single beam klystron at alater point of time.

THP063 Component Tests for the ILC Klystron Clus-ter SystemC.D. Nantista (SLAC), C. Adolphsen,G.B. Bowden, F. Wang (SLAC)Rebaselining of the International Linear Col-lider (ILC) includes an option for producinghigh-power rf on the surface and transporting itdown to and along a single tunnel in overmodedwaveguide (Klystron Cluster System, or KCS). Tominimize the number of shafts required, powerfrom many klystrons (∼30) would be fed intoa single waveguide to drive over a kilometer oflinac. R&D is underway to demonstrate the fea-sibility of this concept. In particular, a 10 m runof the 0.48 m-diameter circular waveguide envi-sioned for this application has been fabricated,as well as prototypes of the device needed totap power into and out of it in the low-loss TE01mode (coaxial tap-off, or CTO). After cold tests,these will be used to demonstrate high powertransmission with an available 3.8 MW L-bandsource. The waveguide will then be resonatedthrough one coupler to build up fields equiva-lent to those of a traveling wave at the 200-300MW level it would see in the ILC. These testswill be done both under vacuum and pressur-ized with nitrogen. We report on this work anddiscuss future plans.

THP064 Design of a Second-Generation ILC MarxModulatorM.A. Kemp (SLAC), A.L. Benwell, C. Burkhart,R. Esmaili, C. Huang, R.S. Larsen, D.J. Mac-Nair, M.N. Nguyen, J.J. Olsen (SLAC)The SLAC National Accelerator Laboratory isleading an effort to design a prototype Marxmodulator to meet the ILC klystron modulatorspecifications; a 120 kV (s 0.5%), 140A, 1.6 mspulse at a 5 Hz prf. A first generation proto-type, the P1 Marx, has been developed and isundergoing life testing*. The design of a second-generation Marx, P2, has been completed andmost sub-systems have been tested**. The P2advances the Marx topology demonstrated bythe P1; eliminating single-point failures, incor-



porating advanced diagnostics/prognostics, andoptimizing engineering margins to improve sys-tem availability. The P2 consists of 32 cells, whichare individually regulated at an output of up to4kV. This is in contrast to the P1 Marx which iscollectively regulated by a series "Vernier" Marx.The 30 of 32 cell redundancy allows for up totwo cell failures without degrading the modula-tor output. Failed cells can be quickly replacedand remotely-serviced. This paper presents thedesign of the P2 Marx. Specific topics discussedinclude the control architecture, mechanical lay-out, and power electronics design. Experimentalresults of both a single and array of cells arepresented.

THP065 Magnetrons as SRF SourcesM. Popovic (Fermilab), A. Moretti (Fermilab)A. Dudas, R.P. Johnson, M.L. Neubauer, R. Sah(Muons, Inc)Magnetrons are the lowest cost microwavesource in dollars/kW, and they have the high-est efficiency (typically greater than 85%). How-ever, the frequency stability and phase stabil-ity of magnetrons are not adequate when usedas power sources for accelerators. Novel vari-able frequency cavity techniques have been de-veloped to phase and frequency lock the mag-netrons, allowing their use for either individualcavities, or cavity strings. Ferrite or YIG (YttriumIron Garnet) materials are placed in the regionsof high magnetic field of radial-vaned, π–modestructures of a selected ordinary magnetron. Avariable external magnetic field that is orthog-onal to the magnetic RF field of the magnetronsurrounds the magnetron to vary the permeabil-ity of the ferrite or YIG material. Measurementsof a prototype magnetron will be described.

THP066 Processing Test Stand For The High PowerCoupler Of An Elliptical SuperconductiveCavity For The MYRRHA ProjetE. Rampnoux (IPN), S. Berthelot, J.-L. Biar-rotte, P. Blache, C. Commeaux, F. Doizon,D. Grolet, P. Szott, J.-F. Yaniche (IPN)MYRRHA project consists of the constructionof an experimental facility in order to demon-strate the technical feasibility of Transmuta-tion of high-level nuclear waste in an Acceler-ator Driver System. Thus the sub-critical coremust be fed by a neutron beam resulting from agreat quality spallation of a high-intensity protonbeam on a target. Because of the induced ther-mal stress to the subcritical core, the high-powerproton LINAC must have a great reliability to



minimize the number of unwanted beam trips.The MYRRHA ADS demonstrator requires a highpower proton superconductive linac (600MeV/4mA) operating in CW mode with the character-istic that each components of it must have thegreatest reliability. In this framework IPN Or-say is in charge of the development of a powercoupler for the 5-cells superconducting cavitiespresent in the high energy section of the linac.We will describe all the stages about power cou-pler developments, from the conception to theconditioning. We will present the design, thecommissioning of the test stand and the resultsof the couplers conditioning. A last part willshow the reliability tests carried out with a 50 kWRF power during a long time.

THP068 Compact Solid State Direct Drive RF LINAC: Experimental ProgramO. Heid (Siemens AG, Healthcare Technol-ogy and Concepts), P. Beasley, T.J.S. Hughes(Siemens AG, Healthcare Technology andConcepts)An RF accelerator driver concept is introduced,which integrates a distributed solid-state RFpower source with the RF resonator. The result-ing structure plays a double role as RF combinerand particle accelerating structure [1]. The keyenabling technologies are Silicon Carbide RFtransistors and a power combiner concept whichincludes insulating parallel cavities to ensureconsistent RF current injection. An experimentaldirect drive lamda/4 cavity with a power rat-ing of 500kW at 150MHz has been constructed.The Direct Drive RF power source consists of 64RF modules constructed from Silicon CarbidevJFETs, radial power combiner and isolation cav-ity. The initial results from the integration ofthe direct drive RF source are presented. Theseresults demonstrate experimentally for the firsttime the validity of the direct drive concept andthe key characteristics of such a drive.

THP069 Stripping of H-minus Beams by ResidualGas in the Linac at the Los Alamos NeutronScience CenterR.C. McCrady (LANL)The linear accelerator at the Los Alamos NeutronScience Center (LANSCE) accelerates both pro-tons and H-minius ions using Cockroft-Walton-type injectors, a drift-tube linac and a side-coupled linac. The vacuum is maintained in therange of 10-6 to 10-7 Torr; the residual gas inthe vacuum system results in some stripping ofthe electrons from the H-minus ions resulting in



beam spill and the potential for unwanted pro-ton beams delivered to experiments. We havemeasured the amount of fully-stripped H-minusbeam (protons) that ends up at approximately800MeV in the beam switchyard at LANSCE us-ing image plates as very sensitive detectors. I willpresent the motivation for the measurement, themeasurement technique and results, and calcu-lations to model the results and possible mitiga-tion schemes.

THP070 Simulation Study of the RF ChopperY. Kondo (JAEA/J-PARC)For the beam current upgrade of the J-PARClinac, a new RFQ (RFQ III)is developing. Thepeak beam current of RFQ III is 50mA. To in-crease the peak current from the existing RFQ(RFQ I), the longitudinal and/or transverse emit-tances are expected to be increased. However,the increase of the longitudinal emittance willaffect the performance of the RF chopper sys-tem. In this paper, detailed simulations of the RFchopper system are described and the require-ment for the longitudinal emittance of the RFQis clarified.

THP071 ExB Chopper System for High IntensityProton BeamsC. Wiesner (IAP), L.P. Chau, H. Dinter,M. Droba, N.S. Joshi, O. Meusel, I. Mueller,U. Ratzinger (IAP)High intensity beams which are increasinglyneeded for a variety of applications pose newchallenges for beam chopping. An ExB choppersystem for proton beams of up to 200 mA andrepetition rates of up to 250 kHz is under devel-opment at IAP. It will be tested and installed inthe low energy section of the Frankfurt NeutronSource FRANZ at beam energies of 120 keV. Thechopper consists of a static magnetic dipole fieldand a pulsed electric field in a Wien filter-typeExB configuration. The electric field temporarilycompensates the magnetic deflection thus cre-ating a proton pulse in forward direction, whilethe duty cycle of the electric field is minimized inorder to reduce the risk of voltage breakdowns.Downstream of the chopper a septum will beused to separate the beams ensuring dumpingoutside the transport line in order to avoid un-controlled power deposition and the resultantproduction of secondary particles. Numeric fieldoptimizations and beam simulations includingsecondary electron effects are presented. Mea-surements of the high voltage pulse generatorbased on MOSFET technology and capable of



generating 12 kV at 250 kHz as well as beamdeflection experiments are shown.

THP072 Slow Chopper For The Spiral 2 ProjectA.C. Caruso (INFN/LNS), F. Consoli, G. Gallo,D. Rifuggiato, A. Spartà, E. Zappalà (INFN/LNS) M. Di Giacomo (GANIL) A. Longhitano(ALTEK)The low energy beam transport line of the Spi-ral 2 driver is designed for CW and high inten-sity beams of protons, deuterons and ions withm/q = 3. A chopper will be used to progressivelyincrease the beam power during accelerator tun-ing, to rapidly remove the beam in case of failuredetection, and to avoid hitting the wheel spokesof rotating targets. The paper describes the fi-nal design and tests of the complete device andof the power circuits, based on standard compo-nents and working up to 10 kV, at 1 kHz repetitionrate.

THP073 Broad-band Beam Chopper for a CW Pro-ton Linac at FermilabS. Nagaitsev (Fermilab), V.A. Lebedev,R.L. Madrak, R.J. Pasquinelli, N. Solyak,D. Sun, R.C. Webber, M. Wendt (Fermilab)The specifications and the initial conceptualideas for a broad-band proton beam chopperFor the Fermilab Project X linac will be pre-sented. The chopper will form bunch patternsrequired by physics experiments and will workin conjunction with a downstream beam splitter,allowing for a variable bunch patterns to be de-livered to up to three experiments concurrently.

THP074 Failure Analysis of the DARHT Second AxisAccelerator Cell SolenoidR.R. Mitchell (LANL), D. Honaberger,B.A. Prichard (LANL) M.E. Schulze (SAIC)The Dual-Axis Radiographic Hydrodynamic TestFacility (DARHT) at Los Alamos National Labora-tory (LANL) consists of two linear induction ac-celerators oriented at right angles to each other.The DARHT First produces a 60 ns pulse with abeam energy of 20 MeV and a beam current of1.9 kA. The DARHT Second Axis produces a 1600ns pulse with a nominal beam energy of 17 MeVand a beam current of 2 kA. The Second AxisAccelerator consists of 74 accelerating induc-tion cells, each incorporating a solenoid com-prised of twelve layers of copper conducting wirecoated by a layer of insulating polymidemideand polyester. During the winding process, acoating of Castall E-301 epoxy was applied tothe wire, forming the exterior boundary of the



solenoid. The solenoids are cooled by low con-ductivity water flowing along the outside andinside surfaces of the solenoid. Recently, threesolenoids developed electrical shorts within thewinding. A comprehensive study has begun todetermine the failure mechanism of the wind-ings and to propose corrective measures. Thispaper describes the results of this study, whichincludes finite element analysis of the DARHTSecond Axis accelerator cell solenoids.

THP075 Laser-Beam Propagation Characteristics inNew Laser-Based Alignment System at theKEKB Injector LinacT. Suwada (KEK), M. Satoh (KEK)A new laser-based alignment system is under de-velopment in order to precisely align accelera-tor components along an ideal straight line atthe KEKB injector linac towards the next genera-tion of B-factories. A new laser optics generatingso-called Airy beam has been developed for thelaser-based alignment system. The laser-beampropagation characteristics both in vacuum andat atmospheric pressure have been systemati-cally investigated at a 82-m-long straight sectionof the injector linac. The results in the measuredpropagation characteristics are in good agree-ment with those analyzed on the basis of theo-retical analysis in Gaussian laser propagation. Inthis report the experimental study is described indetail along with the basic design and recent de-velopment of the new laser-based alignment sys-tem.

THP076 Design of Collimated Laser Beam Optics forthe KEKB Injector Linac Alignment SystemM. Satoh (KEK), T. Suwada (KEK)A new laser-based alignment system is under de-velopment in order to precisely align accelera-tor components along an ideal straight line atthe KEKB injector linac. The new alignment sys-tem is strongly required in order to stably ac-celerate high-brightness electron and positronbeams with high bunch charges and also tokeep the beam stability with higher quality to-wards the next generation of B-factories. Thenew laser-based alignment system consists ofthe LD mounted on auto stage, vacuum duct,photo diode (PD) and PD detector. To eliminatethe laser beam size dependent response of PD,the collimated laser beam propagation along thelinac (around 500-m-long) is strongly required.In this paper, we will report the design of colli-mated laser beam optics for the KEKB injectorlinac alignment system in detail.



THP077 Development of PteqHIJ.M. Maus (IAP), R.A. Jameson, A. Schempp(IAP)For the development of high energy and highduty cycle RFQs accurate particle dynamic sim-ulation tools are important for optimizing de-signs, especially in high current applications. Todescribe the external fields in RFQs as well asthe internal space charge fields with image ef-fect, the Poisson equation has to be solved takingthe boundary conditions into account. In Pte-qHI a multigrid Poisson solver is used to solve thePoisson equation. This method will be describedand compared to analytic solutions for the Two-term-potential to verify the answer of the Poissonsolver.

THP078 Analytical Analysis of Particle-core Dy-namicsY.K. Batygin (LANL)Particle-core interaction is the well-developedmodel of halo formation in high-intensitybeams. In present paper an analytical solutionfor averaged single particle dynamics arounduniformly charged beam core is obtained. Theproblem is analyzed through sequence of canon-ical transformations of Hamiltonian describingnonlinear particle oscillations. An analytical ex-pression for maximum particle deviation fromthe axis is obtained. Results of the study are ingood agreement with numerical simulations andwith previously achieved data.

THP079 Muon Capture in the Front End of the IDSNeutrino FactoryD.V. Neuffer (Fermilab) G. Prior (CERN)C.T. Rogers (STFC/RAL/ASTeC) C. Y. Yoshi-kawa (Muons, Inc)We discuss the design of the muon capture frontend of the neutrino factory International DesignStudy. In the front end, a proton bunch on a tar-get creates secondary pions that drift into a cap-ture transport channel, decaying into muons. Asequence of rf cavities forms the resulting muonbeams into strings of bunches of differing ener-gies, aligns the bunches to (nearly) equal centralenergies, and initiates ionization cooling. Thecooling section uses absorber material(reducingthe 3-D muon momenta) alternating with rf cav-ities (restoring longitudinal momentum) withinstrong focusing magnetic fields. For the Interna-tional Design Study (IDS) this must be optimizedfor performance and cost, and variations will beexplored. A baseline design will be developedfor an engineering and cost study. The design is



affected by limitations on accelerating gradientswithin magnetic fields. The effects of gradientlimitations are explored, and mitigation strate-gies are presented.

THP080 Intrabeam Stripping in H- LinacV.A. Lebedev (Fermilab) A.V. Aleksandrov,A.P. Shishlo (ORNL)A beam loss in the superconducting part of theSNS linac has been observed during its commis-sioning and operation. Although this loss doesnot prevent the SNS high power operation it re-sults in an almost uniform irradiation of linaccomponents and increased radiation levels inthe tunnel. A multi-particle tracking could notexplain the beam loss and its dependence onthe machine parameters. It was recently foundthat the loss is related to the intrabeam particlecollisions resulting in a stripping of one of twoH- ions. The paper describes experimental ob-servations and corresponding calculations of theintrabeam stripping.

THP081 The Stretched Wire Method: A ComparativeAnalysis Performed by Means of the ModeMatching TechniqueM. Panniello (Naples University Federico IIand INFN), V.G. Vaccaro (Naples UniversityFederico II and INFN) M.R. Masullo (INFN-Napoli)The Wire Method for Coupling Impedance eval-uations is quite appealing for the possibility tomake bench measurements on the Device Un-der Test (DUT). However, it is not entirely re-liable because the stretched wire perturbs theboundary conditions, introducing a TEM wavethat has a zero cut off frequency. We expectthat, for frequencies smaller than the cutoff one,this behaviour produces an additional power losswhich drastically lowers the high Q resonancesof DUT. Above cutoff frequency, the impact ofthe stretched wire is not as dramatic as belowcutoff. The Mode Matching Technique will beused to simulate the measurement with the WireMethod. In this way one may get a result whichis not affected by the errors intrinsic of exper-imental measurements. The same method willbe used to get, according to its standard defini-tion, the Coupling Impedance of the real struc-ture. The two results will be compared in order todefine the frequency ranges in which they agreeor disagree. As expected large discrepancies ap-pear below cutoff frequency, while above cutoff,for certain ranges of parameters, an agreement isfound.



THP082 Beam Dynamics Simulation and Measure-ment for the PIAVE-ALPI LinacM. Comunian (INFN/LNL), E. Fagotti,F. Grespan, A. Pisent, C. Roncolato (INFN/LNL)As far as beam dynamics is concerned, the layoutof the PIAVE-ALPI SuperConducting linac, it isinjected either by a XTU tandem, up to 14 MV, orby the s-c PIAVE injector, made with 2 SC-RFQ.The linac (at the present 64 cavities for a totalvoltage up to 48 MV) is build up in two branchesconnected by an achromatic and isochronousU-bend. The PIAVE-ALPI complex is able to ac-celerate beams up to A/q = 7. The linac is quitecomplex due the presence of several accelerat-ing, (SC RFQs and cavities), focusing and trans-port elements. The linac operation, optimizedfor the needs of the users, is described. In par-ticular the effects of a flexible use of the cavitieson the beam dynamics is addressed. The auto-matic tuning procedure of the Toutatis-Tracewinprograms is used for the simulation, and thecomparison with the actual linac performancesis reported.

THP083 An Novel Approach for Beam Commission-ing Environment using SOA Technologyand Performance BenchmarkingG.B. Shen (BNL) P. Chu, J. Wu (SLAC)High level applications provide an efficientmethod to commission and operate an accel-erator. Traditional application adopts a mono-lithic approach, and has to deal with all pro-cessing such as preparing large amount of datainitialization, performing heavy computationand communication, and/or updating a GUIwith high repetition rate. With time going, anapplication might become more complicatedand heavier by adding new required functions.Therefore, it reduces the application perfor-mance and reliability. All applications are cou-pled tightly with its specific environment, there-fore, are not portable. Furthermore, exceptionhandling and message logging increases the ap-plication complexity level. To solve all the draw-backs mentioned, a novel approach is proposedand under development using a SOA technol-ogy. The architecture for applications uses a setof services to replace the traditional all-in-oneapproach. Some prototypes have been devel-oped using structured data so-called PVData/PVStructure and a new EPICS Channel Accessprotocol„PVAccess. The performance of eachservice servers has been benchmarked and an-alyzed. This paper describes our latest progress



and service performance.

THP084 Further Development of the V-Code for Re-circulating Linear Accelerator SimulationsS. Franke (TEMF, TU Darmstadt), W. Ack-ermann, T. Weiland (TEMF, TU Darmstadt)P.A. Görgen, C. Klose, M. Platz (TU Darm-stadt)The recirculating Superconducting DarmstadtLinear Accelerator S-DALINAC, installed at theinstitute for nuclear physics (IKP) at the TUDarmstadt, consist of a 10 MeV Injector anda 40 MeV linac. Utilizing two recirculations, thelinac could be used up to three times, leading to amaximal energy for nuclear physics experimentsof 130 MeV. This recirculating layout makes itpretty complicated to find an accurate setup forthe various beam line elements, especially tomatch the path length of the recirculated beamwith the phase of the accelerating fields. Fastonline beam dynamics simulations can advanta-geously assist the operators because they providea more detailed insight into the actual machinestatus. In this paper further developments ofthe moment based simulation tool V-Code en-abling it to simulate recirculating machines arepresented together with simulation results.

THP085 Single-Shot Emittance Measurement of aBeam from the SPring-8 LinacK. Takeda (LASTI), Y. Shoji (LASTI)The emittance of a single-shot beam from theSPring-8 electron linac was measured. A stabilityof the linac beam was evaluated from the shot-by-shot fluctuation of the emittance. We usedthe electron storage ring NewSUBARU as a partof the measurement system. The electron beamfrom the linac was injected into the ring and cir-culated. The beam profile was measured by afast-gated ICCD camera using the visible light inthe ring. Because of the intentional dipole in-jection errors, the beam position oscillated af-ter the injection in vertical and horizontal direc-tions. It enabled a multi-record of turn-by-turnbeam profiles in one camera frame. The pro-files for several revolutions were used to recon-struct the emittance of the linac beam. The hor-izontal and the vertical betatron tunes were op-timized for the emittance measurement becausethe beam storage was not necessary. We com-pared the results with that by Q-scanning at thebeam transport line, which required multi-shotbeam.



THP086 Beam Transport in a Proton Dielectric WallAccelerator*Y.-J. Chen (LLNL), D.T. Blackfield, G.J. Capo-raso, S.D. Nelson, B. R. Poole (LLNL)Compact dielectric wall (DWA) accelerator tech-nology is being developed at the Lawrence Liv-ermore National Laboratory [1]. The DWA ac-celerator’s beam tube is a stack of high gradientinsulators, consisting of alternating layers of in-sulators and conductors. Characteristically, in-sulators’ surface breakdown thresholds go up asthe applied voltages’ pulse width goes down. Toattain the highest accelerating gradient in theDWA accelerator, the accelerating voltage pulsesshould have the shortest possible duration. Thiscan be done by appropriately timing the switchesin the transmission lines, which feed the contin-uous HGI tube. The accelerating voltage pulsesarrive at the accelerator axis along the beam tubeat different times so as to appear to the chargedparticle bunch as a traveling accelerating volt-age wave. We have studied the beam transportin a baseline DWA configuration by performingPIC simulations using the 3-D, EM PIC code, LSP[2]. Sensitivity of the output beam parameters tothe switch timing will be presented. In additionto the baseline configuration, various alternativefocusing schemes will be discussed.

THP087 Simulation of Cathode Back-bombardmentin a 100 MHz Thermionic RF GunM. Borland (ANL), X.W. Dong (ANL)A 100 MHz thermionic rf gun is under consid-eration as the electron source for the X-ray FreeElectron Laser Oscillator*. Because the sourcemust operate continuously, back-bombardmentof the cathode is a serious concern. We presentresults of simulations of back-bombardment,as well as strategies for reducing the back-bombardment power on the cathode.

THP088 Simulation Study of Debuncher System forJ-PARC Linac Energy UpgradeG.H. Wei (KEK/JAEA) M. Ikegami (KEK)On the beam line after linac in high power pro-ton accelerators, like J-PARC, debuncher systemplays an important role for beam injection to thesucceeding ring. The debuncher system usu-ally gives two functions, namely, to correct thecenter energy jitter and to minimize momen-tum spread and adjust beam energy at the in-jection. To mitigate the nonlinear effects of RFfield, a debuncher system with two debunchercavities was designed for the 181-MeV opera-tion of J-PARC linac. In this design, the first



debuncher is expected to deal with center en-ergy jitter. Then, the second debuncher is uti-lized to control the injection momentum spreadaccording to the requirements from the ring.Although the debuncher system was originallydesigned to minimize the momentum spread,beam-commissioning results show a different re-quirement for the injection momentum spreadto minimize the beam loss in the ring. Basedon the original design and the experimental find-ings with 181-MeV operation, we have designeda debuncher system for the energy upgrade of J-PARC linac to 400 MeV. In this paper, the beamdynamics design of the new debuncher systemis presented together with some particle simula-tion results.

THP089 Beam Dynamics Studies of the REX-ISOLDE Linac in Preparation for its Roleas Injector for the HIE-ISOLDE SC Linac atCERNM.A. Fraser (UMAN), R.M. Jones (UMAN)M.A. Fraser, M. Pasini, D. Voulot (CERN)The superconducting High Intensity and Energy(HIE) ISOLDE linac will replace most of the exist-ing accelerating infrastructure of the Radioactiveion beam EXperiment (REX) at CERN, however,the 101.28 MHz RFQ and 5 MV IH cavity willremain in the role of injector for the upgrade,boosting the beam up to an energy of 1.2 MeV/u.We present the results of a beam dynamics in-vestigation of the injector focused most criticallyon matching the longitudinal beam parametersfrom the RFQ to the SC machine, which is com-plicated largely by the IH cavity employing aCombined Zero Degree* (KONUS) beam dynam-ics design. The longitudinal beam parametersat the RFQ are reconstructed from measurementusing the three-gradient method and combinedwith beam dynamics measurements and simula-tions of the IH structure to design the matchingsection for the SC linac. A tuning procedure forthe injector is outlined, which will be very quickand reliable thanks to the solid-state beam diag-nostics foreseen to accompany the upgrade.

THP090 Modeling A Table Top Storage Ring For ACompact Light Source Using Electromag-netic Field Simulation ToolsT. Roggen (KU Leuven), H. De Gersem,J.P. Locquet, B. Masschaele (KU Leuven)M. Zhukova (Tomsk Polytechnic University,Nuclear Physics Institute)Large synchrotron radiation facilities have be-come one of the most powerful instruments for



research today. All over the world new facil-ities are being constructed or designed. Thebiggest disadvantage of a large synchrotron fa-cility is that the scientific experiments, which areoften very sensitive and complex, have to be per-formed in a dedicated place, sometimes far awayfrom the researcher’s home laboratory. Promis-ing compact synchrotron radiation sources, thatfit in a typical research lab, have been proposedrecently. In this paper results are presented ofan initial study of a single body magnet, lowelectron energy storage ring, performed with theFinite Element (FE) and Finite Difference Time-Domain (FDTD) modeling possibilities in theCST Studio Suite 2010 software package. Insightswere obtained for the most crucial components:the magnet yoke, the internal RF cavity and theresonance injection component. Finally, themodel of the storage ring was verified using theparticle tracker solver which tracks the injectedelectrons along the ring.

THP091 Simulations of Ion Beam Loss in Supercon-ducting RF Linacs with Emphasis on Tails ofParticle DistributionsD. Berkovits (Soreq NRC), B. Bazak, G. Fein-berg, J. Rodnizki, A. Shor, Y. Yanay (SoreqNRC)Design of ion linacs with ion currents of sev-eral milli-amps necessitates detailed simulationsof beam loss. At high intensities, even a smallamount of beam loss can result in significantradio-activation of the linac components. Par-ticle loss can result from longitudinal tails cre-ated in the bunching and pre-accelerating pro-cess, whereas strong transverse focusing and col-limation limit the development of a transversetail. In modern RF ion linacs, bunching andpre-acceleration take place in a radio frequencyquadrupole (RFQ). We present a new approachfor beam loss calculations that places emphasison the tails of the particle distributions. Thisscheme is used for simulating the SARAF proton/deuteron linac, a 176 MHz complex designed tooperate in CW mode at 4 mA beam current. Wedescribe implementation of a RFQ acceleratingelement in the GPT 3D simulation code. Wediscuss our scheme for highlighting the tails ofthe particle distributions generated by the RFQ.These distributions are used as input to simu-lations of the RF superconducting linac, wheresubsequent particle loss is calculated. This tech-nique allows us to increase beam loss statistics bya significant factor.



THP092 Multipacting Simulation and Analysis forthe FRIB Superconducting Resonators Us-ing Track3PZ. Li (SLAC), L. Ge, K. Ko (SLAC) W. Hartung,J.P. Holzbauer, J. Popielarski (NSCL)In the driver linac of the Facility for Rare IsotopeBeams (FRIB), multipacting is an issue of con-cern for the superconducting resonators, whichmust accelerate the ion beams from 0.3 MeV pernucleon to 200 MeV per nucleon. While mostof the multipacting bands can be conditionedand eliminated with RF, hard multipacting bar-riers may prevent the resonators from reachingthe design voltage. Using the ACE3P code suite,multipacting bands can be computed and anal-ysed with the Track3P module to identify poten-tial problems in the resonator design. This paperwill present simulation results for multipactingin half-wave and quarter-wave resonators for theFRIB driver linac and compare the simulationswith RF measurements on the resonators.

THP093 Power Coupler RF Kick and HOMs Analysisof the TRIUMF ICM Capture CavitiesF. Yan (TRIUMF), Y.-C. Chao, C. Gong,S.R. Koscielniak, R.E. Laxdal, V. Zvyagint-sev (TRIUMF)The TRIUMF Injector CryoModule (ICM)adopted two superconducting single cells asthe capture cavities for a low injecting energyof 100keV electrons. Coupler kicks and higherorder modes (HOMs) of the superconductingcavities are two prime concerns for the beamstability, especially for low energy electrons. Byalternating the coupler locations correspondingto the two capture cavities, the kick is compen-sated to get less orbit distortions and projectedemittance growth. The HOMs is another majorissue for the superstructure which has two as-pects of concern: one is cryogenic loss inducedby the HOM power deposited on the cavity wall,another is the HOM effects on the beam. Thispaper presents the analysis method of calculat-ing the transverse kick and projected emittancegrowth induced by the coupler and the HOMseffect for a single cell cavity with electrons. Thesimulation results of the TRIUMF ICM capturecavities for these two issues are described andpresented.



THP094 Map Formalism for Electron Cloud DensityS. Petracca (U. Sannio), A. Stabile (U. San-nio) T. Demma (INFN/LNF)The electron cloud effects are usually studied us-ing numerically intensive and time consumingsimulation codes. A semi analytical approach re-ducing considerably the computational budgethas been suggested to study the electron clouddynamics in RHIC *, and subsequently extendedto LHC **. This approach is based on a quadraticmap which reproduces the evolution of the elec-tron density from bunch to bunch. The mapcoefficients were originally obtained by fit. Wecomputed analytically the linear ** and quadratic*** coefficients of the mapping for the case of freeelectron cloud evolution using a simple physicalmodel, obtaining a good agreement with numer-ical simulations, for a wide range of bunch pop-ulations.

THP095 MyBOC - A Beam Optics Code Based on LieAlgebraG.J. Yang (CAEP/IFP), Z. Zhang (CAEP/IFP)Recently, A beam optics code named MyBOC(MyBeam Optics Code),which is based on Lie alge-bra, has been developed. MyBOC is a charged-particle beam transport code which use Lie-algebraic map method up to 3nd order to treatthe full 6-dimensional phase including all pos-sible linear and nolinear transverse and longitu-dinal couplings. The Nonlinear space-charge ef-fect can be included. The current version of My-BOC can deal with about 20 types of beam trans-port and accelerating elements. The commonelements, like drifts, dipoles, quadrupoles, sex-tupoles, solenoid lens, RF accelerating gaps,andso on, are mostly included. Speclially, some elec-trostatic accelerating and focusing elements arealso included. Unlike other codes, MyBOC iswritten by C++, not fortran. A C++ class librarynamed AccLib is created to deal with the tasks ofsimulation,data input and output. The interfaceof MyBOC is very friendly. The data format on in-put file use HTML-like style, which is almost self-explanatory. The data input can also execute ingraphics mode. The output data can be shown ingraphics and can also be saved to data files. Thephase space along the beamline can be shown inanimation mode.



THP096 Investigation of the Effects of Charge Scal-ing on Emittance Exchange at the FermilabA0 PhotoinjectorA.S. Johnson (Fermilab), H.T. Edwards,E.R. Harms, A.H. Lumpkin, J. Ruan, J.K. San-tucci, Y.-E. Sun, R. Thurman-Keup (Fermi-lab) P. Piot (Northern Illinois University)Next generation accelerators, such as high-energy physics colliders and light sources, willbe interested in phase space manipulationstechniques within two degrees of freedom forenhanced performance. At the Fermilab A0 Pho-toinjector, a proof-of-principle experiment todemonstrate the exchange of the transverse andlongitudinal emittances is ongoing. The emit-tance exchange beamline consists of a 3.9 GHznormal conducting deflecting mode cavity in-serted between two doglegs. Electron bunchesof varying charge levels from 250 pC to 1 nC andenergy of 14.3 MeV are consistently sent throughthe exchange beamline. In this paper we willpresent our latest results on the effects of chargeon the emittance exchange process.

THP097 Development of a Thermionic ElectronGun of the L-band Linac for FEL Opera-tionN. Sugimoto (ISIR), G. Isoyama, R. Kato,S. Suemine, A. Tokuchi (ISIR) S. Kashiwagi(Tohoku University, Research Center for Elec-tron Photon Science)We are conducting FEL experiments with theL band electron linac at Osaka University.The linac is equipped with a thermionic elec-tron gun and the three-stage sub-harmonicbuncher(SHB) system. In FEL experiments an8µs long electron pulse is injected from the gunand the SHB system is turned on for generatinga multi-bunch electron beam of an 8µs durationwith 2nC charge per bunch and 9.2 ns intervalsbetween bunches. It repeatedly amplifies lightpulses stored in the optical resonator of the FEL.The roundtrip time of the light pulses is 37 ns,so that four light pulses are stored in the res-onator. The FEL gain becomes higher at leastin proportion to the peak current in the bunchor charge per bunch. The present charge valueis limited by the high beam loading in the ac-celeration tube of the linac, exceeding a half ofthe input RF power. If the bunch intervals canbe extended to 37 ns, the charge per punch canbe made four times higher for the same beamloading, resulting in significant increase of theFEL gain. To generate such an electron beam,we are developing the electron gun system with



a high-repetition-rate grid-pulser. We will reportthe outline of the study.

THP099 Ultra-High Performance Electron Gun andLinac for the ALPHA ProjectY. Kim (IUCF), G.W. East, S.-Y. Lee, P.E. Sokol(IUCF)For the radiation effect study, Indiana Universityhas been constructing the ALPHA facility witha small electron linac and a small storage ring.For the proper operation of the facility, ultra-highquality electron beams (rms energy spread <0.2%, normalized emittance < 1 um, total chargeof a macropulse > 320 nC, number of micropulse> 11000) should be generated at 50 MeV. To sup-ply such an ultra-high quality electron beams, anadvanced thermionic RF gun with a special qua-drupole triplet based energy collimation systemhas been developed. In this paper, we report theadvanced RF gun using a new energy collimationtechnology and design concepts of the advancedlinac for the ALPHA project.

THP100 Design Concepts of PSI 2.5 Cell S-band RFPhotoinjectorY. Kim (IUCF) M. Bopp, H.-H. Braun, T. Gar-vey, M. Pedrozzi, J.-Y. Raguin (PSI)To supply ultra-high brightness electron beams(slice normalized emittance < 0.43 um, rms sliceenergy spread < 350 keV, peak current > 2.7 kA,beam energy ∼ 6 GeV) for the SwissFEL project,PSI has been developing a 2.5 cell S-band RFphotoinjector recently. Since there are two differ-ent operation charge (10 pC and 200 pC), the RFphotoinjector should be optimized differently.By performing many comparing beam dynam-ics simulations with the LCLS RF gun and CTF3RF gun, we could optimize performance of thePSI 2.5 cell S-band RF photoinjector. In thispaper, we describe design concepts, comparingbeam dynamics simulations, and optimized re-sults of PSI 2.5 Cell S-band RF photoinjector forthe SwissFEL project.

THP101 Generation of Femtosecond Electron Beamin Photocathode RF GunK. Kan (ISIR), T. Kondoh, T. Kozawa,K. Norizawa, A. Ogata, J. Yang, Y. Yoshida(ISIR)Femtosecond electron beam, which is essen-tial for pump-probe measurement, was gener-ated with a 1.6-cell S-band photocathode rf gun.The rf gun was driven by femtosecond UV laserpulse (266 nm), which was generated with third-harmonic-generation (THG) of Ti:Sapphire fem-



tosecond laser (800 nm). The longitudinal andtransverse dynamics of the electron bunch gen-erated by the UV laser was investigated. Thebunch length was measured with the depen-dence of energy spread on acceleration phase ina linac, which was set at the downstream of therf gun. Transverse emittance at the linac exit wasalso measured with Q-scan method.

THP102 Photocathode Femtosecond Electron Linacand Its ApplicationsJ. Yang (ISIR), K. Kan, T. Kondoh, N. Naruse,Y. Nurooka, K. Tanimura, Y. Yoshida (ISIR)J. Urakawa (KEK)Photocathode rf electron linac facilities havebeen developed in Osaka University to revealthe hidden dynamics of intricate molecular andatomic processes in materials. One of the linacswas developed using a booster linear acceler-ator and a magnetic bunch compressor. Thislinac was successfully produced a 100-fs high-brightness electron single bunch and initiatedthe first experimental study of radiation chem-istry in the femtosecond time region. Anotherwas constructed with a photocathode rf gun togenerate a near-relativistic 100-fs electron beamwith a beam energy of 1∼4 MeV. A time-resolvedMeV electron diffraction was successfully devel-oped with this gun to study the ultrafast dynam-ics of structure change in materials.

THP103 Design of a High-repetition RF Gun forSwissFELJ.-Y. Raguin (PSI), M. Bopp, H.-H. Braun,A. Citterio, H. Fitze, M. Pedrozzi, A. Scherer(PSI) Y. Kim (IUCF)We report here on the design of a dual-feed S-band 2.5 cell RF gun, developed in the frame-work of SwissFEL, capable to operate at a 400Hz repetition rate. As in the LCLS RF gun, z-coupling to reduce the pulsed surface heatingand a racetrack coupling cell shape to minimizethe quadrupolar component of the fields havebeen adopted. The cells length and the irisesthickness are as in the PHIN gun operating atCERN. However the iris aperture has been en-larged to obtained a frequency separation be-tween the operating π mode and the π/2 modehigher than 15 MHz. An amplitude modulationscheme of the RF power which allows obtaininga flat plateau of 150 ns for multibunch opera-tion and a reduced average power is presentedas well. With an RF pulse duration of 1µs it isshown that operation at 100 MV/m and 400 Hzrepetition rate is feasible with reasonable ther-



mal stresses.

THP104 S-band Normal Conducting PhotocathodeGun DesignJ.H. Han (Diamond), M.P. Cox, H.C. Huang,S.A. Pande (Diamond)Photocathode RF guns are widely used as injec-tors for accelerators requiring very high qual-ity beams such as free electron lasers and lin-ear colliders and recently used as ultrafast elec-tron diffraction sources. Even with the limitedrepetition rate, normal conducting photocath-ode RF guns generate very low emittance andshort pulse electron beams thanks to their highaccelerating field and the efficient positioning offocusing solenoids. We report our activity of thedesign and production of an S-band normal con-ducting photocathode gun. The RF characteris-tics, thermal heating and vacuum analyses arediscussed.

THP105 Design of an S-band Photoinjector with aHigh Repetition RateJ.H. Han (Diamond)At many laboratories S-band photoinjectors op-erate to provide high quality beams; however therepetition rates are limited to about 100 Hz. Thislimitation mainly occurs due to the guns wherea high RF amplitude of about 100 MV/m is re-quired to keep the beam quality from the spacecharge force. In this paper we design an injectorconsisting of an S-band gun with improved cool-ing and S-band acceleration modules for a repe-tition rate up to 1 kHz. The technical feasibilityand beam dynamics optimization are discussed.

THP106 Design of a Relativistic Ultrafast ElectronDiffraction SourceJ.H. Han (Diamond)Ultrashort electron beams can be used for inves-tigating ultrafast dynamics of physical, chemicalor biological systems. With an S-band photo-cathode gun, simulations have been done in or-der to generate ultrashort electron beams. Opti-mizations to generate ultrashort electron beamswith a small beam divergence and to minimizethe system sensitivity against RF jitter are re-ported.

THP107 Experimental Investigation of Pulsed LaserHeating of Thermionic Cathodes in RFGunsN. Sereno (ANL), M. Borland, K.C. Harkay,Y.L. Li, S.J. Pasky (ANL)One proposed injector for the X-ray Free ElectronLaser Oscillator* uses a 100 MHz thermionic rf



gun to deliver very small emittances at a 1 MHzrate**. Since the required beam rate is only 1MHz, 99% of the beam must be dumped. Inaddition, back-bombardment of the cathode isa significant concern. To address these issues,we propose*** using a laser to quickly heat thesurface of a cathode in order to achieve gatedthermionic emission in an rf gun. We have inves-tigated this concept experimentally using an ex-isting S-band rf gun with a thermionic cathode.Our experiments confirm that thermal gating ispossible and that it shows some agreement withpredictions. Operational issues and possiblecathode damage are discussed.

THP108 Pulsed Laser Heating of Thermionic Cath-odes in RF GunsM. Borland (ANL), B. Brajuskovic, R.R. Lind-berg, N. Sereno (ANL)The proposed injector design for the X-rayFree Electron Laser Oscillator* uses a 100 MHzthermionic rf gun in order to obtain beams withvery small emittances at high repetition rates**.The required beam rate is only 1 to 10 MHz, so90 to 99% of the beam must be dumped. In ad-dition, back-bombardment of the cathode is asignificant concern. To address these issues, wepropose using a laser to quickly heat the surfaceof a cathode in order to achieve gated thermionicemission in an rf gun. This may be preferrableto a photocathode in some cases owing to therobustness of thermionic cathodes and the abil-ity to use a relatively simple laser system. Wepresent calculations of this process using anal-ysis and simulation. We also discuss potentialpitfalls such as cathode damage.

THP109 Potential for an Ultra-low EmittancePulsed Thermionic Triode GunX.W. Dong (ANL), M. Borland, G. Decker, K.-J. Kim, N. Sereno (ANL)The proposed X-ray Free Electron Laser Oscil-lator* requires an ultra-low emittance gun thatgenerates continuous electron bunches at 1 to 10MHz. Recently, T. Shintake raised the possibilityof using a pulsed triode gun with a thermioniccathode. In this paper, we investigate the feasi-bility for such a gun as part of an injector produc-ing normalized emittances in the 0.1 µm rangewith 2 ps rms duration for 50 pC/bunch. We alsoexplore some implementation concepts.



THP110 Generation of Long Bunch Train using RFGunA. Deshpande (Sokendai) S. Araki,M.K. Fukuda, N. Terunuma, J. Urakawa(KEK) K. Sakaue, M. Washio (RISE)At Laser Undulator Compact X-ray Source(LUCX) facility at KEK, we have developed aRF gun with increased mode separation. Wehave successfully generated a bunch train of 300bunches per train with over 150 nC total chargewith peak to peak energy difference less than0.9% at 5.2 MeV energy. After successful resultsfrom above work, we take next step and are nowdesigning and fabricating a new RF gun to deliver10 MeV or more energy. We plan to generate andaccelerate 8000 bunches with 0.5 nC per bunchcharge to generate 10 MeV, 4 uC electron beam.This beam will then collide is collision chamberwith laser to produce soft x-ray. This very com-pact source will be used for future research andother applications. The resultant beam will besimilar to any radiotherapy linac beam and canhave good application in cancer therapy. Thispaper details achieved result with existing gunfor generation of long bunch train and also listsout proposed activity.

THP111 Development of a 500-kV Photo-CathodeDC Gun for ERL Light SourcesN. Nishimori (JAEA) R. Hajima, R. Nagai(JAEA/ERL) Y. Honda, T. Miyajima, M. Ya-mamoto (KEK) H. Iijima, M. Kuriki (HU/AdSM) M. Kuwahara, T. Nakanishi, S. Okumi(Nagoya University) T. Muto (Tohoku Univer-sity, School of Scinece)An electron gun capable of delivering high cur-rent and high brightness electron beam is in-dispensable for next generation energy recoverylinac light sources. A high voltage photocath-ode DC gun is a promising gun for such newlight sources. It is however difficult to apply DChigh voltage on a ceramic insulator with a rodsupporting cathode electrode because of fieldemission from the rod. In order to mitigate theproblem, we have employed a segmented insu-lator with rings which guard the ceramics fromthe field emission and recently succeeded in ap-plying 500-kV on the ceramics for eight hourswithout any discharge. This high voltage test-ing was performed with a simple configurationwithout NEG pumps and electrodes. The nextstep is to repeat the same high voltage testingwith a full configuration necessary for beam gen-eration. We have designed electrodes for themaximum surface electric field not to exceed 11



MV/m at 500 kV while keeping the distance be-tween the electrodes 100 mm. NEG pumps witha pumping speed of 7200 L/s have been installedin the gun chamber. A photocathode preparationsystem was connected to the gun chamber andbeam generation is planned this summer.

THP112 CW Superconducting RF Photoinjector De-velopment for Energy Recovery LinacsJ. Knobloch (Helmholtz-Zentrum Berlinfür Materialien und Energie GmbH,Elektronen-Speicherring BESSY II), W. An-ders, A. Jankowiak, T. Kamps, O. Kugeler,A. Neumann, T. Quast, J. Rudolph, M. Schenk(Helmholtz-Zentrum Berlin für Materialienund Energie GmbH, Elektronen-SpeicherringBESSY II) P. Kneisel (JLAB) R. Nietubyc (TheAndrzej Soltan Institute for Nuclear Studies,Centre Swierk) J.K. Sekutowicz (DESY)ERLs have the powerful potential to provide veryhigh current beams with exceptional and tai-lored parameters for many applications, fromnext-generation light sources to electron coolers.However, the demands placed on the electronsource are severe. It must operate CW, generat-ing a current of 100 mA or more with a normal-ized emittance of order 1 µm rad. Beyond theserequirements, issues such as dark current andlong-term reliability are critical to the success ofERL facilities. As part of the BERLinPro project,Helmholtz Zentrum Berlin (HZB) is developinga CW SRF photoinjector in three stages, the firstof which is currently being installed at HZB’s Ho-BiCaT facility. It consists of an SRF-cavity witha Pb cathode and a superconducting solenoid.Subsequent development stages include the in-tegration of a high-quantum-efficiency cathodeand RF components for high-current operation.This paper discusses the HZB roadmap towardsan ERL-suitable SRF photoinjector, the presentstatus of the facility and first cavity tests.

THP113 Design of the 2.45 GHz ECR Proton Sourceand LEBT in CPHS (Compact PulsedHadron Source)Z. Feng (TUB), X. Guan, J. Wei, Q.Z. Xing,H.Y. Zhang (TUB) Z.W. Liu, H.W. Zhao (IMP)Responding to the demand of accelerator frontinject system of the Compact Pulsed HadronSource (CPHS) in Tsinghua university in 2009,an electron cyclotron resonance (ECR) protonsource (2.45 GHz, 1.5 KW) and a low-energy-beam-transport (LEBT) system are designed andmanufacted. In this source, the H2 plasma isrestricted by an axial magnetic field shaped by



the source body produced by an all-permanent-magnet design (NdFeB rings). The 50-keV pulsedproton beam (50 Hz/0.5 ms) extracted by a four-electrode extraction system from the protonsource passes through the LEBT system (1306mm long), which is consist of two solenoid lens,two steering magnets and a cone configurationoptically matches to the RFQ where the Twissparameters α=1.354, β=7.731. The beam with97% space charge neutralization rate has beensimulated at 100 mA, 150 mm.mrad RFQ outputcurrent by Trace-3D and PBGUN. In this study,we describe the design of the proton source andLEBT technical systems along with intended op-eration.

THP114 H- Ion Source Development for High Per-formanceK.F. Johnson (LANL), E. Chacon-Golcher,E.G. Geros, R. Keller, G. Rouleau, L. Rybar-cyk, J. Stelzer (LANL) O.A. Tarvainen (JYFL)The Los Alamos Neutron Sciene Center (LAN-SCE) accelerator facility has the capability ofaccelerating both H+ and H- ion beams. LANSCEH- User Programs rely on the ion source’s abilityto deliver an appropriate beam current within agiven emittance limit. An active H- ion sourcedevelopment program is ongoing with the goalof improving source performance (e.g. reliabil-ity, availability, increased out current, etc.) Theformation of H- ions in the LANSCE negativeion source occurs on the surface of a negativelybiased electrode (converter), exposed to a fluxof positive ions incident from a cusp-confined,filament-driven discharge. The source typicallydelivers a 16 mA pulsed (60 Hz) H- beam with asource lifetime of 35 days. A program to reach 28-35 mA with the LANSCE source is outlined. It in-cludes efforts to improve filament performance,elevating source body temperatures, optimiz-ing converter geometry and location, optimizingconverter cooling, and increasing the number offilaments from two to three.

THP115 The Development of the H- Ion Source TestStand for CSNSH.F. Ouyang (IHEP Beijing), Y.L. Chi, W. He,T. Huang, G. Li, Y.M. Liu, Y.H. Lu, T.G. Xu, J.S. Zhang, F.X. Zhao (IHEP Beijing)The type of the H- ion source foe CSNS is a Pen-ning Surface Plasma Source (SPS). The outputenergy of the source is 50keV and the pulsed cur-rent of H- beam is 20mA with a rms. emittanceof 0.2π mm.mrad. The construction of H- ionsource test stand for CSNS is finished and com-



missioning of the source is being done. Up tonow, stable H- ion beam with a current up to45mA and energy of 50keV is achieved. Emit-tance measurements of the beam is also beingprepared.

THP116 Tests of the Versatile Ion Source (VIS) forHigh Power Proton Beam ProductionS. Gammino (INFN/LNS), L. Celona,G. Ciavola, D. Mascali, R. Miracoli (INFN/LNS) F. Maimone (GSI)The sources adapted to beam production forhigh power proton accelerators must obey to therequest of high brightness, stability and reliabil-ity. The Versatile Ion Source (VIS) is based onpermanent magnets (maximum value around0.1 T on the chamber axis) producing an off-resonance microwave discharge. It operates upto 80 kV without a bulky high voltage platform,producing several tens of mA of proton beamsand monocharged ions. The microwave injec-tion system and the extraction electrodes geom-etry have been designed in order to optimize thebeam brightness. Moreover, the VIS source en-sures long time operations without maintenanceand high reliability in order to fulfil the require-ments of the future accelerators. A descriptionof the main components and of the source per-formances will be given. A brief summary of thepossible options for next developments of theproject will be also presented, particularly forpulsed mode operations, that are relevant forfuture projects.

THP117 Study of the Frequency Tuning Effect forthe Improvement of Beam Brightness inECR Ion SourcesS. Gammino (INFN/LNS), L. Celona,G. Ciavola, D. Mascali, R. Miracoli (INFN/LNS) F. Maimone (GSI)According to the model that has driven the de-velopment of ECRIS in the last years, a largevariation of the pumping microwave frequency(order of GHz) boosts the extracted current foreach charge state because of a larger plasma den-sity. Recent experiments have demonstrated thateven slight frequency’s changes (of the order ofMHz) considerably influence the output current,and also the beam properties after the extrac-tion (beam shape, brightness and emittance). Inorder to investigate how this fine tuning affectsthe plasma heating, a set-up for the injection ofdifferent microwave frequencies into the ECRIScavity has been prepared. The microwave poweris fed by means of a Travelling Wave Tube ampli-



fier with a broad operating frequency range. Thefrequency can be systematically changed andthe beam output is recorded either in terms ofcharge state distributions and beam emittance.The detected brehmsstralung X-rays are addi-tionally analysed: they give insights about theelectron energy distribution function (EEDF).The results are compared with simulations anddata coming from previous preliminary experi-ments.

THP118 Status of the J-PARC Negative Hydrogen IonSourceH. Oguri (JAEA/J-PARC), Y. Namekawa,K. Ohkoshi, A. Ueno (JAEA/J-PARC)K. Ikegami (J-PARC, KEK & JAEA)A cesium-free negative hydrogen ion sourcedriven with a LaB6 filament is being operatedfor J-PARC. The beam commissioning of J-PARCaccelerators started in November 2006. As ofApril 2010, there have been 32 beam commis-sioning or supply runs. In these runs, the ionsource has been successfully operated in twodifferent modes such as low current mode of 5mA and high current mode of 30 mA. Accordingto the task of the run, one of the two modes wasselected. However, the beam current has beenrestricted to less than 15 mA for the stable opera-tion of the RFQ linac which has serious dischargeproblem from September 2008. The beam runis performed during 4-5 weeks cycles, whichconsisted of a 3-4 weeks beam run and 4 daysdown-period interval. At the recent beam run,approximately 700 hours continuous operationwas achieved, which is satisfied with the require-ment of the ion source lifetime for the J-PARCfirst stage. At every runs, the beam interruptiontime due to the ion source failure is several hours,which correspond to the ion source availabilityof 99 %.

THP119 Developments for Performance Improve-ment of SNS H- Ion Source RF SystemsY.W. Kang (ORNL), R.E. Fuja, T.W. Hardek,S.W. Lee, M.P. McCarthy, M.F. Piller, K.R. Shin,M.P. Stockli, A.V. Vassioutchenko, R.F. Welton(ORNL)The Spallation Neutron Source (SNS) at OakRidge National Laboratory is in the process oframping up the H- ion beam power to 1.4 MW,its full design power for the neutron production.For robust operation of the neutron facility, workis underway for various improvements on the RFpower systems of the ion source. For short andlong-term higher beam power operations, an RF-



driven H- ion source employing external antennawith a water-cooled, ceramic aluminum nitride(AlN) plasma chamber has been developed*. Thenew ion source has been tested to deliver up to42 mA in the SNS Front End (FE) and unanalyzedbeam currents up to ∼100mA (60Hz, 1ms) in theion source test stand. In addition to the exter-nal antenna design for improved antenna life-time, other RF developments for improvementof reliability are running 2 MHz power amplifiersystem is with isolation transformer, employingfull solid-state 2 MHz power amplifier, more pre-cise 2 MHz capacitive impedance matching, andupgrading 13 MHz RF plasma gun system. Thispaper discusses the engineering solutions withanalysis and development of the above RF sys-tems for the new ion source system.

THP120 First Test Result of the IHEP-01 Large Grain9-cell CavityJ. Gao (IHEP Beijing), Y.L. Chi, J.P. Dai,Z.D. Guo, M. Hou, Z.Q. Li, L.L. Men,Q.Y. Wang, Q. Xiao, J.Y. Zhai (IHEP Beijing)H. Hayano, E. Kako, S. Noguchi, M. Sawabe,T. Shishido, N. Toge, K. Watanabe, Y. Ya-mamoto (KEK) T.X. Zhao (IHEP Beiing)The combination of the low-loss shape and largegrain niobium material is expected to be the pos-sible way to achieve higher gradient and lowercost for ILC 9-cell cavities. As the key componentof the ’IHEP 1.3 GHz SRF Accelerating Unit andHorizontal Test Stand Project’, a low-loss shape9-cell cavity using Ningxia large grain niobium(IHEP-01) was fabricated and surface treated(CBP, CP, annealing, pre-tuning) at IHEP. Thenthe cavity was shipped to KEK STF for ultrasoniccleaning, high pressure rinsing, baking and verti-cal test. The cavity reached 20 MV/m in the firstvertical test on July 1st 2010. The quench loca-tion has been found by T-mapping and opticalinspection. The strong field emission and equa-tor defects will be removed by further treatment.The fabrication procedure, surface treatmentrecipes and the first test results are summarizedin this paper.

THP121 Development of an L-band RF Gun forHigh-duty-cycle OperationG. Isoyama (ISIR), R. Kato, N. Sugimoto(ISIR) H. Hayano, H. Sugiyama, T. Takatomi,J. Urakawa (KEK) S. Kashiwagi (Tohoku Uni-versity, Research Center for Electron PhotonScience) M. Kuriki (HU/AdSM)We are developing an L-band photocathode RFgun in collaboration with KEK and Hiroshima



University. The RF gun will be used not only atOsaka University but also at STF of KEK, so thatit can be stably operated at the input RF power of5 MW with 1 ms duration and a 5 Hz repetitionrate, resulting in the average input power of 25kW. The water-cooling system of the 1.5 cell cav-ity is designed, which can take the heat with thetemperature rise of the cavity body by 5oC at theflow rate of cooling water of 358∼723 liter/min.The several parts of the RF cavity are assem-bled with brazing and the most crucial processis brazing of three main components of the RFcavity into one. The brazing has to be tight andperfect not to allow vacuum leak, while the braz-ing filler metal must not go out on to the innersurface of the cavity to avoid discharge triggeredby the scabrous filler metal on the cavity wall.Test experiments are conducted and a guidelineis concluded for such brazing.




FR1 — Invited OralChair: S.G. Tantawi (SLAC)

FR10109:00

Advance In Parallel Computing Codes ForAccelerator ScienceK. Ko (SLAC)SLAC has developed a comprehensive suite of3D parallel electromagnetic codes based onthe finite-element method to solve large-scalecomputationally challenging problem with highaccuracy. The ACE3P (Advanced Computa-tional Electromagnetic 3P) code suite includesthe Omega3P eigenmode and S3P S-parametersolvers in the frequency domain for cavity pro-totyping and optimization, T3P time-domainsolver for wakefields and impedances, Track3Pparticle tracking solver for simulating multipact-ing and dark current, and Pic3P Particle-in-cellcode for RF Gun design. These capabilities withrecent advances and the latest applications ad-dressing important RF related accelerator phe-nomena will be presented.

FR10209:30

Plasma Accelerator Development at theBELLA and FACET ProjectsM.J. Hogan (SLAC)After recent results including demonstration ofnarrow energy spread GeV beams, the US DOEHEP is investing in two new facilities to evaluatethe applicability of plasma based acceleratorsto high energy physics, including developmentof accelerator stages relevant to a potential fu-ture plasma based collider and production ofvery high quality beams. The BELLA facility willcomprise a 1 PW high rep rate laser and tar-get areas to allow experiments on 10 GeV laserdriven plasma wakefield accelerator stages, aswell as control over injection, positron experi-ments, detailed beam diagnostics and radiationproduction. The talk could cover the designs forBELLA accelerator modules, collider concepts,the upcoming facility, and ongoing experimentsto prepare the way for BELLA, including controlover particle beam injection and quality, stag-ing of multiple accelerator modules, radiationdiagnostics of beam performance.

FR10310:00

Commissioning of the EBIS-Based HeavyIon Preinjector at BrookhavenJ.G. Alessi (BNL)This talk will present commissioning of a newheavy ion pre-injector at Brookhaven NationalLaboratory. This preinjector uses an ElectronBeam Ion Source (EBIS), and an RFQ and IH



Linac, both operating at 100.625 MHz, to pro-duce 2 MeV/u ions of any species for use, afterfurther acceleration, at the Relativistic Heavy IonCollider, and the NASA Space Radiation Labora-tory. Among the increased capabilities providedby this preinjector are the ability to produce ionsof any species, and the ability to switch betweenmultiple species in 1 second, to simultaneouslymeet the needs of both physics programs.

FR10410:20

Progress of X-Band Accelerating StructuresT. Higo (KEK)A CERN-SLAC-KEK collaboration on high gra-dient X-band accelerator structure developmentfor CLIC has been ongoing for the past threeyears. A major outcome has been the stable 100MV/m gradient operation of a number of CLICprototype structures. The design of the struc-tures, which have very strong higher-order-modedamping, is based on newly developed high-power scaling laws. The structures are being fab-ricated using the technology which was devel-oped in the GLC/NLC projects which is giving ex-cellent reproducibility. The features of this newgeneration of high-gradient normal conductingstructures and their testing results are reviewed.

FR10510:40

Study of Basic Breakdown Phenomena inHigh Gradient Vacuum StructuresV.A. Dolgashev (SLAC)We present the results of R&D aimed at explor-ing the basic physics of RF breakdown phenom-ena in high vacuum structures. We performedan extensive experimental survey of materials forRF magnetic field induced metal fatigue. To dothis, we designed a cavity operating at a TE01m-like mode which focuses RF magnetic field on theflat sample surface. We tested more than 20 sam-ples of materials including single crystal copper,copper alloys, and refractory metals. With theseresults in hand, we constructed standing wavecavities of different geometries and materials toconduct RF-breakdown experiments. To studya broad range of materials and surfaces, we ex-plored different structure-joining techniques, in-cluding those which allow us to avoid high tem-perature brazing. Using structures of differentgeometries, we examined the effect of the mix-ture of surface electric and magnetic fields onbreakdown behavior. To study this effect furtherwe designed a structure in which we can adjustthe mixture of fields using two independent RFsources.




FR2 — Invited OralChair: Y. Yamazaki (JAEA/J-PARC)

FR20111:30

Current and Possible New Methods forAccelerator-Based Production of MedicalIsotopesJ.A. Nolen (ANL)This talk will review current and possible newmethods for accelerator-based production ofmedical isotopes. It will cover isotopes pro-duced commercially, mostly by relatively lowenergy accelerators, and isotopes producedby government-operated facilities, usually byhigher energy accelerators. Prospects for theproduction of traditionally reactor-producedisotopes such as 99Mo via accelerator-drivenmethods will also be discussed. Also, the specialcase of accelerator production of alpha-emittingisotopes for radio-immunotherapy will be re-viewed.

FR20211:50

Linacs for Muon Collider and Neutrino Fac-toryS. Geer (Fermilab)This talk will review the present Linac designsfor Muon colliders and Neutrino factories. BothMuon colliders and Neutrino factories requirerather unique linac designs to transport largeemittance beams. The talk will present the de-sign and status of these projects.

FR20312:20

Linacs and Scientific/Technological Appli-cationsA. Suzuki (KEK)"We humans have long been obsessed with fourgreat questions: the nature of matter, the originof the universe, the nature of life and the work-ings of mind," which was pointed out by HerbertA. Simon (Nobel Laureate in Economics). Accel-erators have been and will be a powerful tool tochallenge for answers to the above questions ex-cept for the working of mind. In order to openup a new horizon of these sciences, the essen-tial is to innovate in key accelerator technolo-gies. Among other things, the innovation of fourbeam parameters of Energy, Power, size (Space)and timing (Time) with thousand-fold improve-ment is not an evolution, but a kind of revolu-tion to both scientific researches and technolog-ical applications. It is not useless to outline thescientific and technological worlds given by ad-vanced accelerators with the beam structure of1000 TeV (Energy), 100 MW (Power), 100 pico-meter (Space) or 1 femto-second (Time). My pre-



sentation invites you to these worlds. Human be-ings are full of curiosity and obsess to understandunknowns for many millennia.


List of Authors

Italic papercodes indicate primary authors

— A —Abe, N. MOP009Abo-Bakr, M. TUP007Ackermann, W. THP084Aderhold, S. MOP112, THP014Adli, E. MOP018, TUP100Adolphsen, C. MO302, MOP005, MOP067,

TUP015, TUP080, THP021,THP063

Aiba, M. TUP009Aicheler, M. MOP069Ainsworth, R. TUP099Akemoto, M. MO302, MOP012Albert, F. MOP005Aleksandrov, A.V. TUP088, TUP089, WE104,

THP080Alessi, J.G. TUP026, TUP033, TUP034,

FR103Alexeev, N.N. TUP073Alknes, P. MOP075Allen, C.K. TUP087Allison, T.L. MOP095Alsari, S.M.H. TUP028Amaldi, U. THP037Ambattu, P.K. MOP033, MOP072Ames, F. TH202Anders, W. TUP007, THP112Andersen, H.K. TUP054Andersen, T. TUP054Anderson, D.E. THP049Anderson, S.G. MOP005Andersson, A. MOP024, TUP098Andrews, H.L. TUP018Anisimov, A. TUP011Ankenbrandt, C.M. MOP055Antipov, S.P. MOP110Antonsen, T.M. MOP079Ao, H. TU201Aoki, J. TUP092Arai, S. TUP070Araki, S. THP110Araz, A. MOP008Archuleta, R.D. MOP107Arkan, T.T. MO302, TUP081Arnau-Izquierdo, G. MOP075Arnold, A. THP054Asaka, T. TUP014Asano, H. TUP069Asova, G. TUP096, TUP097, TUP097Assadi, S. MOP108, TUP093Azima, A. TUP012


List of Authors

— B —Baartman, R.A. TH202Baba, H. TUP049, TUP050Baboi, N. THP011Bach, H.T. MOP061Bachimanchi, R. MOP095Back, J.J. TUP028Bai, Y.J. TUP046Bajt, S. TUP012Ball, J.A. MOP089Balleyguier, P. MOP098Bandelmann, R. THP015Bandyopadhyay, A. TH202Bane, K.L.F. TUP015, THP021Barbanotti, S. MO302, MOP099, TUP078,

TUP079Barcikowski, A. TUP086Barone, S. TUP031Barth, W.A. MOP040, MOP041, MOP042,

MOP043, MOP044, MOP057,TUP041, TH303

Barty, C.P.J. MOP005Bartz, U. TUP039Batygin, Y.K. THP078Bayer, W.B. TH303Baylac, M.A. TUP032Bayramian, A.J. MOP005Bazak, B. THP091Beard, C.D. MOP048, MOP050, TH202,

THP043, THP044Beasley, P. THP068Bechtold, A. TUP040, WE102Beebe, E.N. TUP033, TUP034Bellodi, G. THP003, THP005, THP006Benwell, A.L. THP064Berkovits, D. TUP074, WE102, THP091Berthelot, S. THP066Bertrand, P. MOP039, MOP098Bettoni, S. MOP024, TUP100Beutner, B. TUP009, TUP102, TUP103Bezuglov, V.V. MOP031Bhang, H.-C. TUP090Biarrotte, J.-L. MOP039, MOP082, TUP020,

THP023, THP066Bierwagen, J. TUP084, THP040Billen, J.H. TUP046, TUP071Bitteker, L.J. MOP061Blache, P. THP023, THP066Blackfield, D.T. THP086Blair, G.A. TUP099Blokland, W. TUP087Bødker, F. TUP054Bödewadt, J. TUP012Bogard, D. MOP001


List of Authors

Boldt, O. MOP112Bolgov, R.O. MOP065Bollen, G. MO203, MOP046Bonnanno, R.E. MOP005Bonnes, U. MOP091Bonomi, R. THP037Boorman, G.E. TUP099Bopp, M. TUP001, THP100, THP103Borissov, E. THP030Borland, M. THP087, THP107, THP108,

THP109Bosotti, A. MO302, TUP078, THP023Bouly, F.B. MOP082, THP023Bourquin, P. MOP071, TUP042Bousson, S. THP023Bowden, G.B. THP063Brajuskovic, B. THP108Brandt, J.S. TUP079Branlard, J. MOP083, MOP084, THP029Braun, H.-H. MOP006, TU102, TUP001,


Bravin, E. TUP100, TUP101, THP006Bricker, S. TUP084, THP039, THP040Brinkmann, A. THP013Briscoe, B. TUP026, TUP027Brodhage, R. M. TUP033Brunner, O. THP052Bryazgin, A.A. MOP031Budde, M. TUP054Bürkmann-Gehrlein, K.B. TUP007Burandt, C. MOP091Burkhart, C. THP049, THP064Burrows, P. MOP024Burt, G. MOP033, MOP072, THP055Busch, M. MOP057, TUP023

— C —Cai, J.C. TUP046Calabretta, L. TUP031Calaga, R. THP055Calatroni, S. MOP070, MOP075, THP004,

THP032, THP033Campisi, I.E. THP042Cancelo, G.I. THP029Candel, A.E. MOP025, MOP073Capatina, O. THP004Caporaso, G.J. THP086Cappelletti, A. MOP021Carlson, K. THP029Carneiro, J.-P. TH301Carrillo, D. MOP018Carter, H. MO302, TUP079, TUP081Caruso, A.C. THP072


List of Authors

Carwardine, J. MO301Catherall, R. MOP054Cee, R. MOP058Celona, L. THP116, THP117Chacon-Golcher, E. THP114Chai, J.-S. MOP093Chakrabarti, A. TH202Champion, M.S. MO302, TUP081, THP026,

THP027Chao, Y.-C. TH202, THP093Chase, B. MOP084, TUP080, THP029Chau, L.P. MOP100, MOP101, THP071Chaurize, S. THP001Chauvin, N. TH302Chel, S. MOP053Chen, H. MOP016Chen, J.E. TUP037Chen, Y.-J. THP086Cheng, C. TUP036Chernov, K.N. MOP031Chevallay, E. MOP001Cheymol, B. TUP101, THP006Chi, Y.L. THP115, THP120Chiba, Y. TUP070Chishiro, E. THP058Cho, M.-H. MOP035, MOP036Cho, Y.-S. TUP021, TUP053, THP035Choi, J.Y. WE202Choroba, S. THP061, THP062Chouhan, S. TUP084Christou, C. MOP017Chu, P. THP083Chu, T.S. MOP005Chubarov, O. TUP054Chung, K.H. MOP035, MOP036Churanov, D. TUP011Ciapala, E. THP004Ciavola, G. THP116, THP117Ciovati, G. THP017Citterio, A. TUP001, THP103Clarke-Gayther, M.A. TUP028Clemens, W.A. THP041Clemente, G. MOP043, MOP044, TH303Clemmer, M.E. THP048Commeaux, C. THP023, THP066Compton, C. MO203, TUP084, THP039,

THP040Comunian, M. TUP057, TUP058, THP082Conde, M.E. MOP110Conrad, J. MOP008Consoli, F. MOP098, THP072Conway, Z.A. TH101Cooley, L. THP027Corlett, P.A. MOP033


List of Authors

Corsini, R. MOP024, TUP099, TUP100Cours, A.R. THP056Cox, M.P. THP104Craievich, P. TUP002Crawford, A.C. MO203Crofford, M.T. MOP088, MOP089, THP047Cross, R.R. MOP005Cullerton, E. MOP084, THP029Curbis, F. TUP012Curtoni, A. MOP001

— D —Dabrowski, A.E. TUP100Dach, M. TUP009Dahl, L.A. MOP041, MOP042, MOP043,

MOP044, TUP041, TH303Dai, J.P. THP120Dallocchio, A. MOP071D’Auria, G. TUP016Davidson, T.L. MOP088, MOP089Dawson, R.J. TH202De Gersem, H. THP090De Martinis, C. TUP031De Michele, G. TUP066, TUP072De Silva, S.U. THP024Dechoudhury, S. TH202Decker, G. THP109Degiovanni, A. THP037Dehler, M.M. MOP073DeLauter, J. TUP084, THP040Delayen, J.R. TU302, THP024Delgiusto, P. TUP002D’Elia, A. THP033, MOP002Delsim-Hashemi, H. TUP012Demma, T. THP094Dennison, G. MOP090Descoeudres, A. MOP070Deshpande, A. THP110Desmons, M. MOP053, TUP042Devanz, G. TH104Dexter, A.C. MOP072, THP055Dhanaraj, N. TUP079Di Giacomo, M. MOP051, MOP098, THP072DiMarco, J. TUP077Dinter, H. THP071Divall Csatari, M. MOP001Djurabekova, F. MOP070Döbert, S. MOP018, MOP067, TUP100Doizon, F. THP066Doleans, M. MO203, MOP046, MOP047,

MOP108, TUP093Dolgashev, V.A. MOP072, MOP076, MOP077,

THP042, FR105Donat, A. TUP011


List of Authors

Dong, X.W. THP087, THP109Drescher, M. TUP012Droba, M. MOP100, MOP101, MOP102,

THP071Du, Q. MOP016Du, T. TUP036Du, X. TUP037Du, Y.-C. MOP016Dubrovskiy, A. MOP024Dudas, A. THP065Düsterer, S. TUP012Dunkel, K. WE102Dutriat, C. TUP101Dziuba, F.D. MOP041, MOP057, TUP023

— E —East, G.W. THP099Ebbers, C.A. MOP005Eckoldt, H.-J. THP061Edwards, H.T. MO304, TUP013, THP096Egger, D. TUP100Ego, H. TUP014Eichhorn, R. MOP008, MOP091Eints, F. THP062Elliott, K. TUP084, THP039, THP040Elsen, E. THP014Emhofer, S. TUP054Enomoto, A. MOP028Eremeev, G.V. THP041, THP042Erickson, J.L. TUP025Erickson, R.A. MOP007Eshraqi, M. THP005, THP003Esmaili, R. THP064

— F —Fabris, A. TUP002Facco, A. MOP056, THP022, THP039Fagotti, E. TUP057, TUP058, THP082Faircloth, D.C. TUP028Faktorovich, B.L. MOP031Falone, A. TUP009Fang, S.X. TUP019Fang, W. MOP064Farabolini, W. MOP001, TUP098Fathy, A.E. TUP047, THP050Faus-Golfe, A. MOP018Favre, G. MOP071Feinberg, G. THP091Feldmeier, E. MOP058Feng, Z. THP113Ferdinand, R. MO201Ferreira, L.M.A. THP032Feschenko, A. TUP085


List of Authors

Fite, J.M. TUP026, TUP027Fitze, H. TUP001, THP103Flisgen, T. THP011Flöttmann, K. MOP081Focker, G.J. TUP101Foley, M.H. MOP099, TUP079Fong, K. MOP090Forck, P. TH303France, A. TUP042Franke, S. THP084Fraser, M.A. THP033, THP089, THP089Frisch, J.C. WE201Frölich, T. THP062Fu, S. TU202, TUP019Fuja, R.E. THP119Fujimoto, T. MOP062Fujisawa, H. MOP105, TUP070Fujisawa, T. MOP060Fukuda, M.K. THP110Fukuda, S. MO302, MOP013, MOP027,

MOP075, THP060Fukui, T. TUP014Fukui, Y. THP058Fukunishi, N. TU104Furuta, F. MOP029, MOP113, MOP114Furuya, T. TUP006

— G —Gabor, C. TUP028Gai, W. MOP110Galambos, J. MOP096, TUP087Gallo, G. THP072Galluccio, F. MOP078Galonska, M. MOP058Gammino, S. THP116, THP117Ganter, R. TUP009Gao, J. THP120Garcia, F.G. TUP029Garcia Tudela, M.G. THP005García-Garrigós, J.J. MOP018Garlasché, M. THP037Garnett, R.W. TUP025, TUP038Garoby, R. THP004Garonna, A. THP037Garvey, T. MOP006, TUP008, THP100Gavrilov, S.A. TUP085Ge, L. THP092Geer, S. FR202Geisser, J.-M. MOP071Gelmetti, F. TUP002Gensch, M. TUP007Gensch, U. THP061Gentini, L. MOP071Gerbershagen, A. MOP024


List of Authors

Gerbick, S.M. THP057Gerhard, P. MOP042, MOP043, MOP044,

TH303Gerigk, F. MOP071, TUP066, THP004Geros, E.G. THP114Gerth, C. TUP011Gertz, I. WE102Gibson, D.J. MOP005Giguet, J.-M. TUP066Gini, L. TUP031Ginsburg, C.M. THP026, THP027Giove, D. TUP031Girardot, P. MOP001, TUP098Glasmacher, T . MOP046Glennon, P. TUP084Glock, H.-W. THP011Görgen, P.A. THP084Golubev, A. TUP073Gong, C. THP093Gonin, I.G. MOP099, THP008Gould, O. TUP026Grabosch, H.-J. TUP096Grassellino, A. MOP048, THP044Grespan, F. TUP055, TUP057, TUP058,

TUP072, THP082Gretlund, J.S. TUP054Grevsmühl, T. THP061, THP062Grice, W.P. TUP088Grimberg, M. THP061Grimm, J. MOP099, TUP079Grin, A. WE102Groening, L. MOP044, TH303Grolet, D. THP066Grudiev, A. MOP002, MOP021, MOP022,

MOP023, MOP025, MOP067,MOP068

Gu, Q. MOP064Guan, W.Q. TUP046Guan, X. TUP019, TUP022, TUP036,

TUP046, TUP071, THP113Gudkov, D. MOP020Gulley, M.S. MOP061, TUP025, TUP038Guo, J. THP042Guo, X.H. TUP044Guo, Z.D. THP120Gurevich, A.V. THP017Gusarova, M. MOP065

— H —Haberer, Th. MOP058Hajima, R. TUP004, THP111Halfon, S. WE102Han, J.H. THP104, THP105, THP106Hanaki, H. TUP014


List of Authors

Hanke, K. THP003Hanna, B.M. THP001Hansen, A. MOP070Hardek, T.W. MOP088, MOP089, THP047,

THP048, THP119Harkay, K.C. THP107Harms, E.R. TUP013, TUP078, TUP080,

TUP081, THP029, THP096Hartemann, F.V. MOP005Hartung, W. MO203, MOP046, MOP047,

TUP084, THP039, THP040,THP092

Hasegawa, K. TUP024, TUP049, TUP050,THP058

Hashimoto, E. MOP032Hass, E. TUP012Hattori, T. TUP035Hayano, H. MO302, THP018, THP036,

THP120, THP121Hayashizaki, N. TUP027, TUP035Haynes, W.B. THP041Hays, S. THP001He, W. THP115He, X. TUP104He, Y. TUP037, TUP044, TUP064,

TUP046Heid, O. THP068Hein, L.M. THP005Henderson, S. MO103Herfurth, F. MOP043Hermanns, T. THP003Hernandez Flano, M. MOP053Hershcovitch, A. TUP106Hessler, S.C. TUP007Higashi, Y. MOP075, THP060Higo, T. MOP012, MOP067, MOP074,

MOP075, THP060, FR104Hillert, W. MOP112Hipp, U. TUP012Hirai, S. MOP032Hitchcock, S. TUP105Hitomi, H. MOP030Hocker, A. TUP078, THP029Hodek, M. TUP084, THP039, THP040Höfle, W. MOP053Hoffmann, M. TUP011Hofmann, B. MOP043Hofmann, I. TH303Hofmann, N. MOP112Hogan, M.J. FR102Hollenborg, I. TUP054Holzbauer, J.P. THP039, THP040, THP092Honaberger, D. THP074Honda, Y. THP111


List of Authors

Honkavaara, K. TUP012Honma, H. MOP012Hori, J. MOP009Hori, Y. TUP049, TUP050Horvitz, Z. TUP045Hou, M. THP120Houck, T.L. MOP005Hovater, C. MOP094, MOP095Hua, Hua„J.F. MOP016Huang, C. THP064Huang, D. MOP066Huang, H.C. THP104Huang, T. THP115Huang, W.-H. MOP016Huang, Z. TUP015Hüning, M. MOP004, TUP011, TUP013Hug, F. MOP008Hughes, T.J.S. THP068Huopana, J. MOP103

— I —Ianigro, J.-C. MOP097Ichikawa, M. THP036Igarashi, Z. TUP076Iijima, H. THP111Ikeda, M. MOP012, MOP111Ikegami, K. THP118Ikegami, M. TUP067, TUP075, TUP076,

MOP087, THP088Ikezawa, E. TUP070Inagaki, T. TUP014Insepov, Z. MOP066Ischebeck, R. TUP009, TUP012, TUP102,

TUP103Isoyama, G. THP097, THP121Ito, N. MOP034Ito, T. TUP069, TUP068Ito, Y. MOP087Ivanisenko, Ye. TUP096Ivanov, E.V. TUP011Iversen, J. THP015Iwashita, Y. MOP105, MOP106, THP036Iwata, S.I. MOP062Iwata, Y. MOP060

— J —Jachmann, L. MOP081, THP061Jameson, R.A. TUP044, THP077Jang, J.-H. TUP021, TUP053Jang, S.D. MOP035, MOP036Jankowiak, A. TUP007, THP112Janssens, R.V.F. MOP045Jason, A.J. TUP109


List of Authors

Jeanneret, J.B. MOP024Jensen, E. TH103Jeon, D. MOP096, TUP088, TH303Jeppesen, H.B. TUP054Ji, Q. THP002Jing, C.-J. MOP110John, K.D. MOP061Johnson, A.S. THP096Johnson, K.F. THP114Johnson, M.J. MOP108, TUP093, MOP046,

MOP047, THP039, THP040,TUP084

Johnson, R.P. MOP055, TUP107, THP065Joireman, P.W. MOP084, THP029Jolly, S. TUP028Joly, C. MOP082, THP023Jones, K.W. TUP025Jones, R.M. MOP002, THP011, THP012,

THP089Jones, S.L. MOP089Jongewaard, E.N. MOP005Joshi, N.S. THP071Jug, G. MOP092Juntong, N. THP011

— K —Kadi, Y. MOP054Kageyama, Y.K. MOP060Kaiser, M. MOP041, MOP043, MOP044,

TH303Kakihara, K. MOP012Kako, E. MO302, TUP005, TUP082,

THP018, THP120Kamenshikov, D.S. MOP065Kamigaito, O. TUP070Kamitani, T. MOP011, MOP012Kamps, T. TUP007, THP112Kan, K. THP101, THP102Kanesue, T. TUP033, TUP034, TUP051Kang, Y.W. TUP047, THP047, THP050,

THP119Karataev, V. TUP099Kase, M. TUP070Kashiwagi, H. TUP051Kashiwagi, S. THP097, THP121Katagiri, H. MO302Katalev, V.V. THP062Kato, R. THP097, THP121Kawamata, H. TUP049, TUP050Kawamura, M. THP058Kawata, H. TUP004Kazakov, S. THP060Kedzie, M. THP057Keller, R. THP114


List of Authors

Kelly, M.P. MOP045, TU304, THP026,THP057

Kemp, M.A. THP049, THP064Kephart, R.D. MO302Kerby, J.S. MO302Kester, O.K. MO203, MOP043, TUP105,

THP039, THP040, TUP084Khabiboulline, T.N. MOP099, TUP078, THP008,

THP011, THP028, THP030Khan, S. TUP012Khan, V.F. MOP002Kharitonov, M. THP017Khojoyan, M.A. TUP096Kikuzawa, N. TUP076Kim, C. WE202Kim, D.G. TUP090Kim, D.I. TUP021Kim, H.S. TUP021, TUP053, THP035Kim, J.-W. TUP090Kim, J.Y. TUP090Kim, K.-J. THP109Kim, K.R. WE202Kim, M. WE202Kim, S.H. MOP035, MOP036Kim, S.-H. TUP047, THP050Kim, Y. MOP006, TUP008, THP099,

THP100, THP103Kimura, H. TUP014Klarner, F. MOP112Klebaner, A.L. TUP080Kleffner, C.M. TUP054Klein, H. TUP020, TUP023Klose, C. THP084Klug, J. THP017Kluge, H.J. MOP043Kneisel, P. THP041, THP112Knobloch, J. TUP007, TH102, THP112Ko, K. MOP025, THP092, FR101Kobayashi, I. MOP060Kobayashi, T. MOP086, MOP087, TUP014Kobayashi, Y. TUP004Köhler, W. MOP081, TUP011, THP061Kojima, T. MOP015, MOP034Kolb, P. MOP048, MOP050, TH202,

THP043, THP044Kolomiets, A. TUP059, MOP040Kondo, K. TUP033, TUP034, TUP051Kondo, Y. TUP049, TUP050, THP070Kondoh, T. THP101, THP102Kondou, Y. MO302Kondrashev, S.A. MOP045, TUP086Konecny, R. MOP110Konomi, T. MOP114, MOP029, MOP113Kononenko, O. MOP021


List of Authors

Konrad, M. MOP008, MOP091Konstantinova, O. A. MOP109Koscielniak, S.R. THP053, THP093, TH202Koshelev, V.A. TUP073Kostin, D. MO302Kot, Y.A. MOP003Kovermann, J.W. MOP070Kozawa, T. THP101Kozhuharov, C. MOP043Krasilnikov, M. MOP081, TUP011, TUP096,

TUP097Kravchuk, L.V. TUP011, TUP017Krawczyk, F.L. TUP018, THP041Kreps, G. THP015Kroc, T.K. TUP029Krönung, D. MOP112Kruse, L. TUP054Kubicki, T. THP029Kubota, T. MOP009Kudo, N.K. THP060Kugeler, O. TUP007, THP112Kulevoy, T. TUP073Kumagai, N. TUP014Kurennoy, S.S. TUP109Kuriki, M. THP111, THP121Kurup, A. TUP028Kuske, B.C. TUP007Kuske, P. TUP007Kutsaev, S.V. MOP065, TUP011Kuwahara, M. THP111Kwon, H.-J. TUP021, TUP053, THP035

— L —Laarmann, T. TUP012Lahti, G.E. MOP095Lalayan, M.V. TUP011Lallement, J.-B. TUP042, TUP066, THP005Lambiase, R.F. TUP033, TUP034Langton, K. TUP092Lanza, G. THP033Lapierre, A. MO203Larsen, R.S. THP064Latina, A. MOP019, MOP026Laurent, L. MOP076Laverty, M.P. MOP090Lawrie, S.R. TUP028Laxdal, R.E. MO202, MOP048, MOP050,

MOP090, TUP092, THP043,THP044, THP053, THP093,TH202

Lazarev, V.L. TUP054Le Noa, Y. TUP042Le Pimpec, F. TUP009Lebas, N. MOP001


List of Authors

Lebedev, V.A. THP073, THP080Lechartier, M. MOP051Lee, D.A. TUP028Lee, K. MOP035, MOP036, MOP032Lee, L. MOP025, MOP073Lee, S.W. MOP088, THP047, THP119,

MOP089Lee, S.-Y. THP099Lee, Y.S. MOP093Lefèvre, T. TUP099, TUP100Leibfritz, J.R. TUP080, TUP081, THP029Leich, H. THP061Leitao Macatrao, M. THP032Lekomtsev, K. TUP099Lempert, G. WE102Lengkeit, M. THP013Lesrel, J. THP023Letchford, A.P. TUP028Levand, F. TUP086Lewellen, J.W. TUP018Leyge, J.F. MOP051Li, D. TUP052, THP002Li, G. THP115Li, J. TU202, THP046, TUP046Li, Q. TUP104Li, R.K. MOP016Li, Y.L. THP107Li, Z. MOP025, MOP005, TUP015,

THP092, TUP065Li, Z.Q. THP120Liebig, C. MOP004Liepe, M. TU303, THP034Lilje, L. MO302Lillestol, R.L. MOP018Lindberg, R.R. THP108Lipka, D. TUP094Liu, W. MOP110Liu, Y. TUP043, TUP044, TUP088Liu, Y.M. THP115Liu, Z.C. THP016Liu, Z.W. THP113Lockey, R. TUP033, TUP034Locquet, J.P. THP090LoDestro, V. TUP026, TUP027, TUP033,

TUP034Lombardi, A.M. TUP042, TUP066, THP004,

THP005Longhitano, A. THP072Longuevergne, D. MOP048, MOP050, THP043,

THP044, TH202Lorbeer, B. THP011Lu, L. TUP035Lu, Y.H. THP115Lu, Y.R. TUP037


List of Authors

Ludwig, F. TUP011Lukin, A.N. MOP031Lumpkin, A.H. THP096

— M —Ma, Y. MOP056, THP022Macha, K. THP041Machau, K. THP062Machicoane, G. MOP046MacNair, D.J. THP064Madrak, R.L. THP073Madrid, M.A. THP042Mahalingam, S. MOP066Mahgoub, M. TUP096Maier, M.T. MOP044, MOP043, TH303,

TUP054Maimone, F. THP116, THP117Makarov, I. MOP031Maltezopoulos, Th. TUP012Mangerel, A.P. MOP050Mann, T.L. MOP108, TUP093Manus, R. THP041Mapes, M. TUP033, TUP034Marchetto, M. MOP050, TUP092, TH202Mardor, I. WE102Marhauser, F. THP009Marsh, R.A. MOP005Marti, F. MO203, MOP046, MOP047,

MOP108, TUP093, TUP105,TUP106, THP039, TUP084,THP040

Martin, D.W. THP042Martinez, A. THP029Maruta, T. TUP076Mascali, D. THP116, THP117Masschaele, B. THP090Masullo, M.R. MOP078, TUP031, THP081Masuzawa, M. MOP105Matheisen, A. MO302Mathot, S.J. TUP042Matsumoto, H. TUP049, TUP050Matsumoto, S. MOP012, MOP067, MOP074,

MOP075, THP060Matsumoto, T. MO302Matsushita, H. MO302, THP060Matveenko, A.N. TUP007Maus, J.M. TUP040, THP077McCarthy, M.P. THP119McCrady, R.C. THP069McCrory, E.S.M. TUP029McGee, M.W. THP029McIntosh, P.A. MOP033McIntyre, P.M. THP038McNabb, D.P. MOP005


List of Authors

McNerney, A. TUP034, TUP033Meissner, J. MOP081, TUP011Mellace, C. THP037Men, L.L. THP120Menshov, A.A. TUP088Merminga, L. TH202Meseck, A. TUP007Messerly, M. J. MOP005Meusel, O. MOP100, MOP101, MOP102,

THP071Michelato, P.M. THP023Micheler, M. TUP099Michizono, S. MO302Mickat, S. MOP041, MOP042, MOP044,

MOP057, TH303Middendorf, M.E. THP047, THP048Mikulec, B. THP003Milas, N. TUP009Miller, D. R. THP040Miller, S.J. TUP084, THP039, THP040Milloch, M.M. TUP002Milocco, A. TUP002Milosic, T. TH303Miltchev, V. TUP012Minaev, S. MOP040, TUP073Miracoli, R. THP116, THP117Mishra, C.S. TH201Mitchell, D.V. MO302Mitchell, R.R. THP074Mitra, A.K. THP053, TH202Mittenzwey, M. TUP012Miura, A. TUP067, TUP075, TUP076Miura, T. MO302Miyadera, H.M. TUP109Miyajima, T. THP111Miyao, T. TUP076Moeckly, B. THP042Möller, W.-D. MO302, THP015Molloy, S. MOP019Momozaki, Y. TUP106Mondal, M. TH202Montesinos, E. THP055Moody, N.A. TUP018Moretti, A. TUP029, TUP107, THP065Morishita, T. TUP049, TUP050Morozov, P. THP062Morozumi, Y. THP019, THP020Morpurgo, G. MOP024Morris, D. TUP084Moss, A.J. MOP033Mosthaf, J.M. MOP058Mu, Z.C. THP046Mueller, A.C. TUP020Müller, I. THP071


List of Authors

Müller, R. TUP007Murakami, T.M. MOP060Muramatsu, M. MOP060Musson, J. MOP095Mustapha, B. MOP045, MOP049, TUP059Muto, T. THP111

— N —Naboka, A. MOP081Nagai, R. THP111Nagaitsev, S. TUP080, THP002, THP073Nagamiya, S. MO101Nagler, A. WE102Naik, V. TH202Naito, F. TUP049, TUP050, TUP069,

THP058Nakai, H. MO302Nakajima, H. MO302, MOP012Nakamura, N. TUP004Nakanishi, T. THP111Nakao, K. MOP012Nam, S.H. WE202Namekawa, Y. THP118Namkung, W. MOP035, MOP036Nanmo, K. TUP068, TUP069Nantista, C.D. TUP015, TUP080, THP021,

THP063Naruse, N. THP102Nassiri, R. THP016Nath, S. TH304Natsui, T. MOP032Neil, G. TU103Neilson, J. MOP077Nekhaev, V.E. MOP031Nelson, S.D. THP086Nesterenko, I. TUP088Neubauer, M.L. TUP107, THP065Neuffer, D.V. TUP108, THP079Neumann, A. TUP007, THP112Ng, C.-K. MOP025Nguyen, D.C. TUP018Nguyen, M.N. THP049, THP064Nielsen, C.V. TUP054Nietubyc, R. THP112Nikolskiy, K.I. MOP065Niles, S.P. TUP018Nishimori, N. THP111Noda, A. MOP062Noda, K. MOP060, MOP062Nölle, D. TUP094, TUP095Noguchi, S. MO302, TUP005, TUP082,

THP018, THP120Nolen, J.A. TUP106, FR201Noll, D. MOP100, MOP101


List of Authors

Nordlund, K. MOP070Norem, J. MOP066, THP017Norizawa, K. THP101Nortier, F.M. MOP061Norton, D. TUP084, THP039, THP040Nousiainen, R.J. MOP104Novo, J. TUP042Nurooka, Y. THP102Nusinovich, G.S. MOP079

— O —

Österberg, K. MOP103

Ogata, A. THP101Ogawa, Y. MOP012Oguri, H. THP118Oh, J.-S. MOP035, MOP036Ohkoshi, K. THP118Ohsawa, S. MOP012, MOP111Ohuchi, N. MO302, TUP082Okamura, M. TUP026, TUP027, TUP034,

TUP033, TUP051Okihira, K. TUP110Okuda, S. MOP015, MOP034Okumi, S. THP111Oliva, J.C. TUP105Olsen, J.J. THP064Olvegrd, M. MOP018Olyunin, A. MOP022Orlandi, G.L. TUP009, TUP103Orlov, Y. MO302

Osterberg, K.Ostreiko, G.N. MOP031Ostroumov, P.N. MOP045, MOP049, TUP059,

TUP086, THP057Otake, Y. TUP014Otevrel, M. TUP096Ott, K. TUP007Ouyang, H.F. TU202, THP115Ozelis, J.P. THP026

— P —Pagani, C. MO302, TUP078Palladino, V.C. TUP111Palmieri, A. TUP055, TUP057, TUP058Pande, S.A. THP104Panfilov, A.D. MOP031Panniello, M. THP081Paparella, R. MOP053, TUP078, THP023Paramonov, V.V. MOP081, TUP017, TUP011,

TUP060Pardo, R.C. MOP045, TUP086Park, K.-H. MOP093Park, S.J. WE202, MOP035, MOP036


, MOP104MOP103, MOP104

List of Authors

Park, S.S. WE202Parma, V. THP004Pasini, M. MOP054, THP033, THP089Pasky, S.J. THP107Pasquinelli, R.J. THP073Pasquino, C. MOP075Pearce, P. THP037Peaucelle, C. MOP039Peauger, F. MOP001, TUP098Pedersen, C.G. TUP054Pedrozzi, M. MOP006, TUP001, TUP008,


Peggs, S. TU203Pekeler, M. WE102Pellin, M.J. THP017, THP042Penco, G. TU101Penno, M. THP061Pepato, A. TUP058Perdikakis, G. MO203Perkins, M. TUP028Perrot, L. MOP097Perry, A. TUP091, WE102Perry, C. MOP024Peters, A. MOP058Peterson, T.J. MO302Petracca, S. THP094Petrarca, M. MOP001Pfister, J. MOP043Phillips, D. TUP033, TUP034Piel, C. WE102Pierini, P. MO302, MOP053, TUP020,

THP023Pietralla, N. MOP091Pikin, A.I. TUP033, TUP034Pilipenko, R.V. THP030Pillai, C. MOP061Piller, M.F. MOP088, THP047, THP119Piot, P. THP096Piquet, O. MOP053, TUP042Pischalnikov, Y.M. MOP085, TUP078, THP030,

THP029Pisent, A. TU301, TUP055, TUP057,

TUP058, THP082Platz, M. THP084Plawski, T. E. MOP094, MOP095Plostinar, D.C. MOP080, TUP028Podlech, H. MOP041, MOP057, MOP101,

TUP023Pogue, N. THP038Pohl, M. TUP011Polini, M. MOP071Poole, B. R. THP086Popielarski, J. MO203, TUP084, THP092,


List of Authors

THP039, THP040Popielarski, L. MO203, TUP084, THP039,

THP040Popovic, M. MOP055, TUP029, TUP107,

THP002, THP065Portillo, M. MO203Posocco, P.A. THP005Power, J.G. MOP110Pozdeyev, E. MOP046, MOP047, MOP108,

TUP093Pozimski, J.K. TUP028Pribaz, F. TUP002Prichard, B.A. THP074Prior, G. THP079Proch, D. THP015Proslier, Th. MOP066, THP017, THP042Pugnat, D. MOP071, TUP042

— Q —Qiao, J.M. THP046Quast, T. TUP007, THP112Quincey, T. MOP008Quint, W. MOP043

— R —Rabiller, A. TUP100Raguin, J.-Y. MOP006, TUP001, TUP008,

THP100, THP103Raich, U. TUP101, THP006, THP007Raimondi, P. MOP026Rainò, A.C. TUP031Ramberger, S. TUP066, TUP072Rampnoux, E. THP066, THP023Raparia, D. TUP026, TUP027, TUP033,

TUP034Ratzinger, U. MOP040, MOP041, MOP057,

MOP043, MOP100, MOP101,MOP102, TUP023, TUP033,THP071

Raubenheimer, T.O. MOP005Rawat, V. MOP025Rawnsley, W.R. TUP092Redon, N. MOP097Reece, C.E. THP010, THP038Reed, B. TUP106Rehders, M. TUP012Reiche, S. TUP009Reid, J. TUP080, THP029Reinhardt-Nickoulin, P.I. TUP085Renzi, A. MOP078Reschke, D. THP014Richards, J.E. TUP092Riddone, G. MOP020, MOP067, MOP074,


List of Authors

MOP103, MOP104, TUP098Ries, T.C. TH202Riffaud, B. MOP071Rifuggiato, D. THP072Rimjaem, S. TUP096Rimmer, R.A. THP041Ristori, L. MOP099, THP030Ritter, J. TUP026, TUP027, TUP033,

TUP034Rodnizki, J. TUP045, TUP091, THP091,

WE102Rönsch-Schulenburg, J. TUP012Rogers, C.T. THP079Roggen, T. THP090Rohdjess, H. TUP054Rohlev, A. TUP002Romanov, G.V. THP002Roncarolo, F. TUP101, THP006, THP007Roncolato, C. TUP057, THP082Ross, M.C. MO302RoSSbach, J. TUP012Rossi, C. TUP042Rouleau, G. THP114Roux, R. MOP001Rovelli, A. TUP031Rowe, A.M. THP026Roybal, R.J. THP041Ruan, J. THP096Ruber, R.J.M.Y. MO303, MOP001, TUP098Rudolph, J. THP112Rusnak, B. TUP018Rybarcyk, L. THP114

— S —Sabirov, B.M. TUP083Sah, R. THP065Sahni, V.C. TH201Saisut, J. TUP097Saito, K. MOP029, MOP113, MOP114Sakabe, N. MOP111Sakai, H. TUP006Sakai, T. MOP111Sakamoto, N. TUP070Sakanaka, S. TUP004Sakaue, K. THP110Sako, H. TUP075, TUP076, TUP067Samoshkin, A. MOP020, TUP098, MOP104Sanderson, D. MO203, TUP084Santiago Kern, R. MOP075Santucci, J.K. THP096Sargsyan, E. TUP066, THP005Sasano, T. MOP060Sato, S. TUP076Satoh, M. MO302, TUP005, TUP082,


List of Authors

WE203, THP018, THP075,THP076

Sattarov, A. THP038Sauer, A.C. MOP043Savage, P. TUP028Savard, G. MOP045, TUP086Sawabe, M. THP120Sawamura, M. TUP006Scaduto, J. TUP033Scantamburlo, F. TUP055, TUP058Scarpa, F. MOP056, THP022Scarpine, V.E. THP001Schappert, W. MOP085, TUP077, TUP078,

THP030, THP029Scheloske, S. MOP058Schempp, A. MOP040, MOP042, MOP043,

TUP039, TUP040, TUP041,TUP034, TUP044, THP077

Schenk, M. THP112Schenkel, T. THP002Scherer, A. THP103Schibler, E. MOP097Schietinger, T. TUP009, TUP102, TUP103Schlander, F. THP014Schlarb, H. TUP011, TUP012Schlitt, B. TUP054Schlott, V. MOP006, TUP008, TUP103Schmidt, J.S. TUP034Schmitz, M. MOP004Schulte, D. MOP019, MOP023, MOP024Schulte, K. MOP102Schultze, J. MOP081, TUP011Schulze, M.E. THP074Schussman, G.L. MOP025Schwarz, S. MO203Schwerg, J.N. THP052Scorrano, M. TUP078Scott, R.H. TUP086Sedillo, J.D. THP041Seidman, D.J. MOP095Seifter, A. MOP061Sekachev, I. TH202Sekutowicz, J.K. TUP010, THP015, THP112Semenov, V.A. MOP005Seol, K.T. TUP021Sereno, N. THP107, THP108, THP109Sergatskov, D.A. TUP077Serpico, C. TUP002Sertore, D. THP023Sha, S. TUP044Shaker, H. TUP100Sharamentov, S.I. THP057Sharkov, B.Y. TUP073Shen, G.B. THP083


List of Authors

Shi, A. TUP044Shi, J. MOP022Shibuya, S. MOP062Shidara, T. MO302Shin, K.R. TUP047, THP050, THP119Shinoe, K. TUP006Shinozaki, S. THP058Shintake, T. TUP014Shinton, I.R.R. THP011, THP012Shirai, T. MOP062Shishido, T. MO302, TUP005, TUP082,

THP018, THP120Shishlo, A.P. TUP089, THP080Shoji, Y. MOP014, THP085Shor, A. THP091Shverdin, M. MOP005Siders, C. MOP005Sieber, T. TUP054Siemens, M. TUP094Simon, C.S. MOP001Singer, W. THP013, THP015Singer, X. THP013Sinitsyn, O.V. MOP079Sitnikov, A. TUP073Skowronski, P.K. TUP100Smart, L. TUP033, TUP034Smirnov, A.Yu. MOP065, TUP011Snuverink, J. MOP019Snydstrup, L. TUP033, TUP034Sobenin, N.P. MOP065, TUP011Søby, L. TUP100Sodomaco, N. TUP002Sokol, P.E. THP099Solley, D.J. THP049Solodko, A. TUP098Solyak, N. WE101, THP073Song, Y.-G. TUP021Souda, H. MOP062Spartà, A. THP072Stabile, A. THP094Staples, J.W. TUP052, THP002Steimel, J. THP001Steiner, B. TUP054Stelzer, J. THP114Stephan, F. MOP081, TUP011, TUP096,

TUP097Sterbini, G. MOP024Stirbet, M. THP051Stockli, M.P. THP119Stöhlker, T. MOP043Stovall, J. TUP071, TUP046, THP005Stulle, F. MOP019, MOP024Suda, K. TUP070Suemine, S. THP097


List of Authors

Sugimoto, N. THP097, THP121Sugimura, T. MOP111Sugiyama, H. THP121Sun, D. THP073Sun, L.P. TUP044Sun, T. TUP086Sun, Y.-E. THP096Suwada, T. THP075, THP076Suzuki, A. FR203Suzuki, H. THP058Suzuki, S. TUP014Swenson, D.A. MOP059Syratchev, I. MOP018, MOP025, MOP074Szott, P. THP066

— T —Taborelli, M. MOP070Tahir, M.I. MOP033Tajima, T. THP041, THP042Takahashi, T. TUP006, MOP009Takatomi, T. THP121Takeda, K. THP085Takenaka, T. MO302Takeuchi, T. MOP060Tamura, J. TUP034Tanaka, H. TUP069Tang, C.-X. MOP016Tang, J. MOP096Taniguchi, R. MOP015, MOP034Tanimura, K. THP102Tanke, E. MOP046, MOP047, MOP108,

TUP093Tantawi, S.G. MOP076, MOP077, MOP005,

THP042Tardy, T. MOP071Tarkeshian, R. TUP012Tarnetsky, V.V. MOP031Tartaglia, M.A. TUP077Tarvainen, O.A. THP114Tauchi, T. MOP105Tecker, F. TUP100Terashima, A. MO302Terechkine, I. TUP077Terunuma, N. THP110Therasse, M. THP033Therkildsen, Ka.T. TUP054Thieberger, P. TUP106Thominet, V.G. TUP103Thuillier, T. MOP039Thurman-Keup, R. THP096Tian, K. THP009Tiede, R. MOP040, MOP057, TUP033Tiefenback, M.G. MOP037Timko, H. MOP070


List of Authors

Timmins, M.A. TUP042Tiunov, M.A. MOP031Tkachenko, V.O. MOP031Togawa, K. TUP014Toge, N. MO302, THP120Tokuchi, A. THP097Toms, R. MOP024Tong, D.C. MOP064Tongu, H. MOP062, MOP105, THP036Toporkov, S.E. MOP065Toral, F. MOP018Touchi, Y. TUP070Trento, G. THP056Treptow, K.R. THP029Trowitzsch, G. TUP011Tsuchiya, K. MO302Tupikov, V. MOP084, THP029Turlington, L. THP041Tuske, O. MOP039

— U —Ueno, A. THP118Uesaka, M. MOP032Umemori, K. TUP006, THP018Umer, R. TUP002Urakawa, J. THP102, THP110, THP121Urbant, M. TUP011Uriot, D. MOP039, TH303Urschütz, P. TUP054Usher, N.R. TUP084Ushijima, S. MOP105

— V —Vaccaro, V.G. MOP078, TUP031, THP081Valdez, F.O. MOP061Valles, N.R.A. THP034Valuch, D. MOP053Vandeplassche, D. TUP020Vandoni, G. TUP042Varghese, P. MOP084, THP029Variale, V. TUP031Vashchenko, G. TUP096Vasilyev, I.V. TUP085Vassioutchenko, A.V. TUP047, THP047, THP119Veitzer, S.A. MOP066Velasco, M. TUP100Veljak, L. TUP002Verdú-Andrés, S. THP037, THP037Verhanovitz, N. TUP084, THP040Verzilov, V.A. TH202Vicario, C. TUP009Vilcins, S. TUP094Vincent, J.J. TUP084


List of Authors

Vinzenz, W. MOP040, MOP042Virostek, S.P. TUP052, THP002Vlieks, A.E. MOP005Vogel, E. TUP013Vondrasek, R.C. TUP086Vormann, H. MOP040, MOP042, MOP044Vorobjev, G. MOP043Voronin, L.A. MOP031Vossberg, M. MOP042, TUP041, TUP034Voulot, D. THP089Vretenar, M. MOP071, TUP042, TUP066,

TUP072, WE103Vuitton, VC. TUP101

— W —Wagner, R. THP062Wang, C.-X. THP016Wang, D. TUP002Wang, F. MOP067, TUP015, THP063Wang, H. THP009Wang, J.Q. TUP019Wang, J.W. MOP067, MOP005Wang, Q.Y. THP120Wang, Z.J. TUP037, TUP064Washio, M. THP110Watanabe, K. MO302, TUP005, TUP082,

THP018, THP036, THP120Watanabe, Y. TUP070Webber, R.C. TUP048, THP001, THP002,

THP031, THP073Weber, S.V. TUP054Webster, A. TUP088Wegner, R. MOP071, THP037Wei, G.H. TUP067, TUP075, THP088Wei, J. TUP036, TUP046, TUP071,

THP113Weiland, T. THP084Weingarten, W. THP004Weise, H. MO102, MO302Weissman, L. TUP074, TUP091, WE102Weisz, S. THP004Welton, R.F. THP119Wendt, M. THP001, THP073Wenndorff, R.W. MOP081, TUP011, THP061Wezensky, M. THP049Wieland, M. TUP012Wiesner, C. MOP100, THP071Wildman, D. THP001Wilinski, M. TUP033Winkelmann, T.W. MOP058Wise, P. TUP028Witgen, K. THP040Withofs, Y.L. THP032Wlodarczak, J. MO203, TUP084, THP039,


List of Authors

THP040Wu, J. THP083Wu, X. MOP108, TUP093, MO203,

MOP047, MOP046Wuensch, W. MOP002, MOP022, MOP025,

MOP067, MOP068, MOP070,MOP075

— X —Xia, J.W. TUP037Xiao, C. TUP037Xiao, Q. THP120Xing, Q.Z. TUP046, THP113Xiong, Z.F. TUP046Xu, T.G. TU202, THP115Xu, X.A. THP046

— Y —Yakovlev, V.P. THP002, THP008, THP027Yamada, K. TUP070Yamaga, M. TUP014Yamamoto, A. MO302Yamamoto, K. TUP076Yamamoto, M. THP111Yamamoto, Y. MO302, TUP005, TUP082,

THP018, THP036, THP120Yamazaki, M. THP058Yan, F. MOP050, THP093, TH202Yan, L.X. MOP016Yanay, Y. TUP074, THP091Yang, G.J. THP095Yang, H.R. MOP035, MOP036Yang, J. THP101, THP102Yang, Y.Q. TUP037Yaniche, J.-F. THP066Yano, Y. MOP012Yao, Y. THP046Yaramyshev, S.G. MOP040, TH303Yin, X. TU202, TUP061, TUP062,

TUP063Yokoyama, K. MOP067, MOP075, MOP012Yoneda, C. THP042Yonehara, K. TUP108York, R.C. MOP108, TUP093, MOP046,

MOP047, TUP084, THP039,THP040

Yoshida, M. MO302, MOP012, THP060Yoshida, Y. THP101, THP102Yoshikawa, C. Y. TUP108, THP079Yoshioka, M. MOP115, TUP049, TUP050Young, L.M. TUP071, TUP046Yusof, Z.M. MOP110


List of Authors

— Z —Zaltsman, A. TUP033, TUP034Zaplatin, E.N. THP039Zappalà, E. THP072Zasadzinski, J. THP017Zavadtsev, A.A. TUP011Zavadtsev, D.A. TUP011Zelenski, A. TUP026Zennaro, R. MOP002, MOP067, TUP001,

TUP098Zhai, J.Y. THP120Zhang, C. TUP023, TUP041Zhang, D.H. THP001Zhang, H.Y. TUP071, THP113Zhang, J. S. THP115Zhang, K. TUP104Zhang, P. THP011, THP011Zhang, X. MOP096Zhang, Z. THP095Zhang, Z.H. THP046Zhang, Z.L. TUP044Zhao, F.X. THP115Zhao, H.W. TUP037, TUP044, THP113Zhao, Q. MOP108, TUP093, MO203,

MOP047, MOP046Zhao, T.X. THP120Zhao, Y.L. TUP071Zhao, Z.T. MOP064Zhemanov, V. THP062Zheng, Q. MOP090Zheng, S.X. TUP036, TUP071Zhou, F. MOP005, TUP015Zhou, W. THP046Zhu, K. TUP037Zhukov, A.P. TUP089Zhukova, M. THP090Zinkann, G.P. TUP086Zmuda, T.J. THP029Zvyagintsev, V. MOP048, MOP050, THP043,

THP044, THP093


2010 - cern · 2010. 9. 1. · 2010 international linac conference september 12 – 17, 2010...

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