The MDT chambers of the ATLAS Muon Spectrometer will operate in a heavy LHC background environment mainly from photons and neutrons. The ionization produced by neutron recoils is much higher than the one from photons or muons and can be simulated by the use of alpha particles. A systematic study of the behavior of the ATLAS Monitored Drift Tubes (MDTs) under controlled irradiation has been performed. The presence of alpha particles results in the reduction of the gas gain due to space charge effects. The gas gain reduction has been studied in a single tube set up using a well controlled radium (226{sup left}Ra) source in order to enrich the tube gas (Ar/CO{sub}2) with the alpha emitter 220{sup left}Rn and irradiate the tubes internally. The results are confronted with Garfield simulations.
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机译：ATLASμON光谱仪的MDT腔室将主要从LHC背景环境中操作，主要来自光子和中子。中子反冲产生的电离远高于来自光子或μONs的电离，并且可以通过使用α颗粒来模拟。已经进行了对受控照射下的地图集监测漂移管（MDTS）的行为的系统研究。由于空间电荷效应，α颗粒的存在导致气体增益的降低。已经在使用良好控制的镭（226 {SUP} RA）源的单管中研究了气体增益，以便用α发射器220烹制管气（AR / CO {SUB} 2）{SUP左} rn并在内部照射管。结果面临着GARFIELD模拟。
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