Detector development and physics studies towards the super LHC

本课题的主要任务是为大型强子对撞机提升ATLAS介子触发系统中TGC （Thin Gap Chamber）的耐辐射性能进行研究。特别有趣的是中子的影响；它偶尔会引起由中子撞击产生的高电离粒子产生的大信号。利用MeV能量范围的中子束研究了对探测器性能和老化性能的影响，得到了改进的认识。电子设备也可能是一个问题，目前的电子设备可能无法在升级后的大型强子对撞机的恶劣环境中发挥作用。调查是在电子专家的帮助下进行的。这些研究的结果在会议和讲习班上进行了介绍和讨论。- 2005年11月，“用于大型强子对撞机亮度升级的μ子系统”研讨会，川本联合主席，CERN； 2005年9月，“使用单色中子的TGC加速老化试验”，田中等人，JPS会议；2005年2月，CERN； 2005年2月，“用于高亮度的ATLAS升级研讨会”；2006年11月，CERN； 2006年11月，“中子对TGCs的影响研究”；利用蒙特卡罗模拟对现有的LHC和ATLAS进行了详细的研究，然后将其外推到升级后的LHC。这些研究的结果在会议和会议上发表，例如：“在大型强子对撞机上的希格斯玻色子搜索”，s.a asai等人，JPS会议，2005年9月。从这些研究来看，目前的探测器在适度升级后可以在超级大型强子对撞机上工作。然而，在靠近光束的区域，预计性能会恶化。调查开始寻找这些问题区域的替代探测器技术。为编写在欧洲核子研究中心为这类研究建立一个新的辐照设施的建议作出了贡献

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 2007In 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 2005From 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