1

Japanese activities in LHC

Takahiko Kondo, KEK

May 12, 2007

The KEK-CNRS/IN2P3-CEA/DSM/DAPNIA Collaboration Meeting at KEK

2

1994.12 CERN Council approved LHC in 2 steps

1995.5 Japan : 5 BYen (65 MCHF).

1996.3 India : $ 12.5M.

1996.6 Russia : 67MCHF (incl. detectors).

1996. Canada : Canadian$ 30M.

1996.12 Japan : 3.85 BYen (44 MCHF).

1996.12 CERN Council approved LHC in 1-step.

1997.12 US : $200M (accelerator) + $331M (detectors).

1998.5 Japan : 5 BYen (56 MCHF).

2002.6 LHC completion changed to 2007.

LHC internationalization

3

23 June 1995 Minister of Monbusho announced the contribution of 5 BYen (65 MCHF) for the construction of LHC at the CERN Council. Japan becomes a CERN’s observer state for LHC.

Minister Kaoru Yosano

CERN DGChris Lewellyn SmithDharuma

doll

4

Superconducting Quadrupoles for LHC IPs

Design and construction done by KEK with Toshiba

B gradient : 215 T/mLength : 6.5 mAperture : 70 mmHigher multipoles < 10-4

Coil winding at Toshiba

Excitation test at KEK

Cross section

5000

6000

7000

8000

QuenchNo Quench

Que

nch

Cur

rent

(A

)

MQXA-1 2 3 5 4

215 T/m

230 T/m

Quench Sequence

2b

Thermal cycle

Thermal cycle

7 106 9 8 111st T.C.

1912 13

Thermal cycle

14 15112nd T.C.

16

Bore modification

17 18

Quench history

Technique developed is applied for the magnets of the J-PARC n beam line.

5

- KEK constructed 20 low-b superconducting quadrupole magnets for LHC IPs.

In-kind contribution to LHC

Construction

Already installed in the LHC tunnel

KEK KEKFermilab

6

March 27, 2007: Test Failure of Quad magnets at P 5

During the pressure test, the Q1 magnet moved by 13 cm due to the asymmetric forces and broke various components. It was caused by design mistake of the spider support.

Fermilab and CERN (and KEK) are working tightly for repairing the magnet supports.

7

ATLAS Collaboration

34 Countries 151 Institutions~1300 Scientific Authors

15 institutes from Japan　　 ~ 60 physicists

KEK, Tsukuba, Tokyo ICEPP, Tokyo MU, Shinshu, Nagoya, Ritsumeikan, Kyoto, Kyoto UE, Osaka, Kobe, Okayama, Hiroshima, Hiroshima IT, Nagasaki IAS

country Cost sharing (MCHF) Institutes Sci. Authors

3 France 52.76 (11 %) 7 90 (6.9 %)

7 Japan 32.18 (7.0 %) 15 61 (4.7 %)

8

Coil at Toshiba (1999)

into LAr Cryostat (Feb. 2004)

ATLAS Central Solenoid : 100% by KEK

Down to the pit (Oct. 2004)

Full excitation was achieved in the final position (Aug. 1 2006)

7730 A2.00 T

7980 A

slow dump

9

Thin Gap Chambers (TGC) for muon endcap triggering Japan made 1200 TGC chambers out of 3600. Almost all electronics are design and constructed by Japan.

Big wheel in the pit

KEK and Kobe

72 sectors assembled at CERN B180

transportation

10

ATLAS Silicon Micro-strip Detector (SCT) 　　　　　　　　　　　　

4 sensors/module

KEK assembled 980 modules (40%) Module mounting at Oxford U.

using robots made by KEK

Excellent noise distribution obtained during SR1 cosmic-ray

testCosmic-ray tracks at SR1 (May

2006)

Hamamatsu

Japan Mektron

SeikoPrecision

11

LyonLyon

Clermont-FerrandClermont-Ferrand

Ile de Ile de FranceFrance

MarseilleMarseille

NantesNantes

StrasbourgStrasbourg

AnnecyAnnecy

Tier-1: CC-IN2P3

Disk ArraysPC ServersTape Robot

Grid system for LHC

Tier-2 Center for ATLAS at ICEPP of Univ. of Tokyo withstrong linkage to Lyon Tier-1 Center.

12

Collaboration on ATLAS data/physics analysis with LAPP

has started

Dr. Junji Tojo (KEK) is collaborating with LAPP group (led by Isabelle Wingerter-Seez) on ATLAS e/gamma performance and H γγ under the CNRS/IN2P3 programme.

↓

Proposed enlarging the SDA_1 FJPPL collaboration for 2007 by including activities of Tojo and a work on DIPHOX generator.

13

R&Ds for LHC Upgrade

(1) Development of the Nb3Sn conductor for higher field quadrupole magnets for IR (by A. Ya

mamoto, K. Tsuchiya in collab. with US, CERN). 　

(2) New Rad-hard silicon microstrip sensor for ATLAS inner tracker (by Y. Unno ………).

(3) New muon chamber readout TDC chips (by Y. Arai) and TGC readout (by O. Sasaki).

14

Other items with CERN(1) Sending KEK experts for LHC accelerator commissioning (K. Oide, A. Morita….).

(2) CERN-Japan Fellows: 2 physicists/year.

(3) Participation of young Japanese students in the CERN Summer School every year. Try to increase 3 -> 5 students in 2007.