| Co-Investigator(Kenkyū-buntansha) |
KOBAYASH Tomio The University of Tokyo, International Center for Elementary Particle Physics, Professor, 素粒子物理国際研究センター, 教授 (50126059)
ASAI Shoji The University of Tokyo, International Center for Elementary Particle Physics, Associate Professor, 素粒子物理国際研究センター, 助教授 (60282505)
TANAKA Shuji High Energy Accelerator Research Organization, Institute of Particle and Nuclear Studies, Research Associate, 素粒子原子核研究所, 助手 (80311124)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2006: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2005: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Research Abstract |
The main subject of this project is to investigate for LHC upgrade the radiation tolerance properties of the TGC (Thin Gap Chamber) in the ATLAS muon trigger system. Of particular interest is the effect of neutrons ; it causes occasional big signals arising from highly ionizing particles produced by impact of neutrons. Effects on detector performance and ageing properties were studied using neutron beams of MeV energy range, and improved understandings have been gained. The electronics could also be a problem, the current ones may not function in the harsh environment of the upgraded LHC. Investigations were made with the help of electronics experts. The results of these studies were presented and discussed in conferences and workshops.
- Workshop on 'Muon system for LHC luminosity upgrade', T.Kawamoto co-chair, CERN, November 2005
- 'Accelerated ageing test of TGC using monochromatic neutrons', S.Tanaka et al., JPS meeting, September 2005
- 'Workshop on ATLAS upgrades for High Luminosity', CERN, February 2005
-'Study of neutron impacts on TGCs', A.Ochi, in 'ATLAS upgrade workshop', CERN, November 2006
-'Muon detector upgrade workshop', T.Kawamoto co-chair CERN, January 2007
In the physics area, detailed studies were made using Monte Carlo simulation, first focusing on the current LHC and ATLAS, then to extrapolate to the upgraded LHC. Outcomes of these studies were presented in conferences and meetings, for example:
-'Higgs boson searches at LHC', S.Asai et al., JPS meeting, September 2005
From these studies it appears the current detector would work at super LHC with modest upgrades. However in the region close to the beams, deterioration of performance is expected. Investigation was started to see alternative detector technologies for these problematic region. A contribution was made to write-up a proposal of building a new irradiation facility at CERN for such R＆Ds
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