clic related cern-kek collaboration j.p.delahaye for the clic study team

CLIC related CERN-KEK collaboration

J.P.Delahaye

for the CLIC study team

CERN-KEK Committee 07/12/07J.P.Delahaye 2

Outline

• Long standing collaboration between CERN & KEK in the frame of Linear Colliders R&D

• CERN participation in KEK Accelerator test facility (ATF):– Generation of low emittance beams (micro rad-m)

– Focusing to extremely low beam sizes (nm)

• KEK participation in High Gradient RF structures R&D (100 MV/m):– Fabrication of normal conducting structures@KEK

– Tests with power of structures @ KEK

CERN Participation in ATF


ATF collaborationATF collaboration damping-ring prototype ATF at KEK

achieves world’s smallest emittance beams;pioneered numerous diagnostics developments(laser wires, diffraction radiation, X-ray optics, interferometry, …)

tuning & correction schemes

trains young generation of accelerator physicists final focus ATF-2

truly international projectuses low-emittance beam extracted from ATF ring

aims to produce 30 nm spot size with less than 5% orbit “jitter”

test of diagnostics (nm-BPMs, spot-size monitors)test of feedbacks & stabilization schemes

polarized e+ source via Compton back-scattering(PosiPol collaboration; beam tests at ATF)


QD31T

ML5TBPM.2

BH1R

BH1R.36BH1R.19

BH1R.18

BPM.1

ZV51RZH48RBPM.48

BPM.49

QF1R.14 ZV24R ZH23R

QF2R.14 QF2R

QF1R.28

QF31T

ZH30T

ZV30T

Beam Dump

MW1XMW1X

MW2XMW3X

MW4X

　 ATF　 Damping Ring

Electoron Linac

BT( Beam Transport Line )

Extraction Line

SR Monitor

RF Cavity

Wiggler

Injection Kicker

Seputum Magnets

Extraction KickerWiggler

East Arc

North Straight

South Straight

West Arc

Wire scanner

E=1.28GeVNe=1x1010 e-/bunch 1 ~ 20 bunches

Rep=1.5HzX emit=2.5E-6 m ( at 0 intensity)

Y emit=2.5E-8 m ( at 0 intensity)

Accelerator Test Facility

Damping ring

Linac

H. Hayano

ATF is the largest LC Test Facility

~ ILC emittance requirements


ATF demonstrated single bunch emittancex~3.5-4.3 m

(1.4-1.7 nm)y~13-18 nm

(5-7 pm)at 8x109 e-/bunch

CLIC target valuesx~0.5 m y~3 nm at 4x109 e-/bunch

?


Beam sizes at Collisions

R.M.S. Beam Sizes at Collision in Linear Colliders

ILC500

CLIC500

CLIC3000

FFTBSLC

ATF2

0.1

1

10

100

1000

10 100 1000Horizontal Beam Size (nm)

Ver

tica

l B

eam

Siz

e (n

m)


KEK Crab Cavity Group has relocated clearing space for ATF2.Floor refurbishment finished this fall. 　ATF2 requires rearranging extraction line components and connecting it to ATF2 beam line during 2008 summer shutdown.


ATF/ATF2 master scheduleconsistent with CLIC feasibility study by 2010


effective since August 1, 2005

ATF-MoU

about 20 member institutes


ATF Spokesperson(s)J. Urakawa, KEKThree Deputies (with help of sub-Deputies from KEK) Deputy for Beam operation: S.Kuroda (T.Okugi)Deputy for Hardware maintenance: N.Terunuma (M.Kuriki)Deputy for ATF2: A.Seryi (T.Tauchi)

ATF System and Group Coordinators (SGC)H.Weise, DESYF.Zimmermann, CERNPhilip Burrows, UKGrahame Blair, UKP. Bambade, LALM. Ross, FNALJ. Nelson, SLACA. Seryi, SLACR. Meller, Cornell (US Univ),J.Gao, IHEP/Beijing,E.S.Kim, KNU,/KoreaK.Kubo,S.Kuroda,N.Terunuma,M.Kuriki,T.Tauchi,T.Okugi,R.Sugawara, KEK,T.Sanuki, University of Tokyo


ATF Technical Board (TB)

Europe…………………………...E. Elsen, DESYG. Blair, RHUL (Royal Holloway, University of London) P. Burrows, Oxford University+ QMULF. Zimmermann, CERNA. Wolski, CI

North America…………………..T. Raubenheimer, SLACM. Ross, FNAL

Asia………………………………K. Yokoya, KEKN. Toge, KEKT. Sanuki, University of TokyoJ. Gao, IHEPE-S. Kim, KNU


ATF International Collaboration Board (ICB)

Bob Kephart FNALBrian Foster OxfordDavid Miller UCLMitsuaki Nozaki KEKMichael Harrison BNLJ.P. Delahaye CERNJai Gao IHEPJohn Corlett LBNLKaoru Yokoya KEKEckhart Elsen DESYNobaru Sasao Kyoto UniversityPaterson, Ewan (chair) SLACPhilip Burrows OxfordRobert Meller Cornell UniversitySachio Komamiya University of TokyoTsutomu Nakanisi Nagoya UniversityWashio Masakazu Waseda UniversityJinhyuk Choi PAL


CERN hardware contribution to ATF-2• honeycomb table (from TMC)

• honeycomb structure with length 2.4 m, width 0.8 m, height 0.8 m

• absence of structural resonance below 230 Hz• table previously used for CLIC stabilization study• presently on loan at LAPP/Annecy• ATF purpose: to stabilize the final quadrupoles

• stabilizing feet (STACIS2000 from TMC)• equipped with geophones, rubber pads for passive damping,

and piezo-electric movers for active damping of load vibrations induced from the ground

• had been offered too, but LAPP found: not useful for ATF2 • value about 100,000 CHF (8.72 MYen)

LAPP/Annecy will ship honeycomb table (or identical new table it will purchase) table to KEK in 2008


CLIC test stand for vibration measurements & magnet stabilization studies

S. Redaelli, R. Assmann


ongoing & planned CERN ATF “studies” development of commissioning strategy;

already wrote section of design report

• investigation of optimum beam-based alignment pro-cedures with pertinent specification of BPM ranges

• simulation of IP tuning and maximum tuning knobranges

• survey of relevant collective effects in ATF-2and ATF extraction line; particularly wake fields + ions

• participation in commissioning activities

1 person month

3 person months

3 person months

4 person months

1 person month in total:1 person yearapproved by CSCon 13.10.2005

EUROTeV&BDIR LondonMeeting 2005;Nanobeam’05


CERN live participation

• many pre-2004 visits (J.-P. Potier, F. Zimmermann)• 7th Int’l ATF coll. mtg 2001 (H. Braun, F. Zimmermann)• 3-wk ATF visit by M. Korostelev 12/2004 - measurements of ATF DR damping times

with and w/o wiggler - alternative low-emittance DR design

• 3-wk ATF visit by R. Tomas 12/2006 - measurements of resonance driving terms in ATF damping ring

- skew quadrupole requirements for vertical dispersion correction at ATF2 - feasibility study of octupole tail folding for ATF2

• 2-wk ATF visit by R. Tomas 12/2007• 1-wk ATF visit by F. Zimmermann 12/2007• ATF collaboration meetings and IFIC-LAL-CERN meetings in Annecy,

Geneva, Hamburg, Valencia and Paris (H. Braun, R. Tomas, F. Zimmermann); ATF TB & SGC meetings

• regular ATF2 and PosiPol phone meetings


25% of ATF Reports in 2006 with CERN lead authors


CERN-IFIC-LAL-UK collaboration on ATF

participants: P. Bambade (LAL), A. Faus-Golfe (IFIC), R. Tomas, F. Zimmermann (CERN), R. Appleby (CI); >4 PhD students and postdocs

anomalous current-dependent emittance growth between ring and extraction line;

topics: four-dimensional emittance diagnostics in the extraction line

bi-monthly meetings and discussions

first beam studies in November/December 2007


additional future collaboration subjects• beam halo studies • IBS effects (bunch shape & tails) • flight simulator• code comparisons• Compton e+ stacking studies


polarized e+/e- sourcebased on laser Compton back scattering

M. Kuriki, T. Omori, J. Urakawa, KEKK. Moenig, A. Variola, F. Zomer, LALE. Bulyak, P. Gladkikh, NSC KIPT

highly polarized e+ and e- (>90%); fully independent e+ generation

Compton e- ring

experimental verification at ATF (e.g. Phys.Rev.Lett.96:114801,2006)


Draft of Collaborative agreement being preparedas a follow-up of visit@CERN of Prof Suzuki on 02/07/07


Collaboration agreement

• "Agreement on Collaborative Work", under reference ICA- JP-0103. Two signature versions are at CERN with the Legal Service, awaiting green light by KEK for signature.

• Appendix 1: 2003 Memorandum concerning the Participation of Japanese Summer Students in the CERN Summer Student Programme

• Appendix 2: general “umbrella” for high-gradient studies & collaboration on High Gradient Accelerator Technology and Fabrication and Tests of X-Band Accelerating Structures

• Appendix 3 to Agreement on Collaborative Work: Design, fabrication and test of high gradient accelerating structures T18_vg2.4_disk and TD18_vg2.4_quad

• Appendix 4: next to be written, accelerating structures disk damped + next round of structures based on test results


High-gradient accelerating structure production

• Objective of the collaboration:Both KEK and CERN in the past decade have been forerunners in

the world for the R&D’s of high gradient acceleration on the basis of normal conducting accelerator structures. The objective of this collaboration is to facilitate further development of related key technologies, in particular the X-band technologies, by the two parties

• Technical contacts:– KEK:

• Yukihide Kamiya, Director of Accelerator Laboratory of KEK• Toshiyasu Higo, Accelerator Laboratory of KEK• Shigeki Fukuda, Accelerator Laboratory of KEK

– CERN: • Jean-Pierre Delahaye, CLIC study leader • Walter Wuensch, CLIC structure leader• Germana Riddone, CLIC structure production• Steffen Doebert, CLIC structure testing


• Acceptable Breakdown Rate in linear collider operation not higher than 10-6

• Reduction of accelerating field by about 30 MV/m for low BR with Cu

Cu

Mo

CLIC High-Power tests various materials results @ 30 GHz

CLIC operational

goal


The beauty of 12 GHz

• Close to maximum Performance and minimum Cost (14 GHz)• Accelerating gradient of 100 MV/m already demonstrated at low breakdown

rate with short pulse in non fully equipped structures• Very close to the NLC and JLC frequency: 11.4 GHz

– Building up on wide expertise and long-term R&D made during many years on warm structures, RF power sources, beam dynamics at SLAC and KEK

– Take advantage of low(er than 30 GHz) frequency for easier fabrication (tolerances, vacuum), relaxed requirements (alignment, timing, etc…),

• RF power generation and frequency multiplication in CLIC TBA RF Power Source– High gradients achievable with short RF pulse provided by TBA RF

power source– Easy adaptation of CTF3 (multiplication factor by 8 instead of 10)

• Stand alone power sources available:– Makes the best use of developments and equipments at SLAC and KEK


X-band (11.4 GHz) Test Facilities at KEK

Single Klystron (50 MW) test stand up and running

NEXTEF: Available from fall 2007, 2x50 MW, 400 ns, 24/7 operation


The state of the Art in x-band structures

Final NLC/GLC prototype, fully equipped with higher order mode damping, a pair of these structures made by KEK was tested in the ASSET facility at SLAC to determine the wake fields and demonstrated the extremely high standards in precession machining achieved by KEK.

Tests of old NLC structures at short pulses

T53vg3MC can be used as a first reference for the new CLIC parameters

CLIC goal


2007 2008

Nov Dez J an Feb Mar Apr May J un J ul Aug Sept Oct Nov

Facility Structure

CTF3 30 GHz NDS4_vg3.6_thin

C30_vg4.7_quad

C30_vg2.6

C30_vg8.2

C30_vg2_TM02

HDS11_vg2

C30_vg4.7_sb

CLEX 12 GHz Pets 12 GHz

T18_vg2.4_disk

NEXTEF 11.4 GHz KX03

Old CLI C vg1.1

T18_vg2.4_disk[2]

T18_vg2.4_disk[3]

TD18_vg2.4_quad[2]

TD18_vg2.4_disk[2]

SLAC Station 1 TD18_vg2.4_quad[1]

11.4 GHz C10vg0.7[1]

C10vg1.3[1]

C10vg3.3[1]

C10vg2.2_thick[1]

HXD11 Cu big grains

SLAC Station 2 T28_vg2.9

C10vg0.7[2]

C10vg1.3[2]

C10vg3.3[2]

C10vg2.2_thick[2]

T53vg3MC

SLAC Station 3 T18_vg2.4_disk[1]

T18_vg2.4_disk[4]

PETS 11.4 GHz

TD18_vg2.4_disk[1]


Near future accelerating structures

• T18_VG2.4_disk (disk undamped): 3 structures– Objective: to use JLC espertise in structure fabrication to study a

structure with rf parameters close to nominale ones, huigh quality data by testing multilple structures (a forth structure will be fabricated by EU company and tested at CERN)

– #1, #2: fabrication of disks by KEK, delivered to SLAC, ready for bonding, then tested at SLAC and KEK

– #3: all made and tested by KEK

• TD18_VG2.4_quad (quadrant damped): one structure– Objective: learn about quadrant fabrication and assembly– Test cutting by 5 companies: HITACHI, I I C, YASDA,

Morikawa, U-corporation– Select one company to make a prototype quadrant– Fabrication of one full structure– Test full structure at KEK

June

-07

to M

ay-0

8 (t

est

not

incl

uded

)

July

07

to J

une-

08

(tes

t no

t in

clud

ed)

Red: to be done


Kek’s schedule for structure testing using the NEXTEF facility


T18_VG2.4_disk

Structure elements for #1 and #2

Bead pull system for rf measurements


Input matching and transmissionin clamped T18_VG2.4_disk (#1 and #2) cavity

Very good performance!


TD18_VG2.4_quad

3D dimensional control under way

Test piece received in Nov 2007


Conclusion

~Excellent collaboration between CERN and KEK about Linear Colliders & CLIC related activities:

• ATF 1,2 @ KEK:– Strong CERN involvement– microrad beam emittances,nm spot sizes & nm stability crucial for CLIC– looking forward to <40 nm spot sizes in 2008/09!

• High Gradient RF structures R&D– Excellent KEK expertise and vital contribution– CERN/KEK/SLAC fruitful collaboration – Fabrication and tests of RF structures on existing Test stands– Participation in RF designs– looking forward to > 100 MV/m accelerating gradient in 2008/09!

• Possible future collaboration:– More exchange of exoperts and visits – Modulator development: one KEK expert on CTF3 modulator for one year– High power X band klystron developments– Number of R&D subjects in the frame of CERN-Japan fellowship program

clic related cern-kek collaboration j.p.delahaye for the clic study team

Documents

cern kek

kek slide

cernkek committee

atf slide

kek deputy

kek tests

atf ring

hayano atf