Title :
A study of gas mixtures for the Atlas MDT
Author :
Zhao, T. ; He, L.
Author_Institution :
Dept. of Phys., Washington Univ., Seattle, WA, USA
Abstract :
Results of a gas study for the ATLAS Monitored Drift Tubes (MDT) are reported. The electron drift velocity, Lorentz angle and tube radius to drift time relations are calculated for selected gas mixtures by using the CERN drift chamber simulation code GARFIELD/MAGBOLTZ. The drift tube efficiency, gas gain, avalanche size and self-quenching streamer (SQS) mode fraction as functions of anode voltage are measured by using radioactive sources. Discussions of the results, including effects of nitrogen and water vapor, are presented
Keywords :
drift chambers; gas mixtures; high energy physics instrumentation computing; muon detection; position sensitive particle detectors; ATLAS Monitored Drift Tubes; Atlas MDT; CERN drift chamber simulation code; GARFIELD/MAGBOLTZ; Lorentz angle; SQS mode fraction; anode voltage; avalanche size; drift time relations; drift tube efficiency; electron drift velocity; gas gain; gas mixtures; radioactive sources; self-quenching streamer mode fraction; tube radius; water vapor effects; Anodes; Atmosphere; Electron mobility; Electron tubes; Helium; Hydrocarbons; Laboratories; Linearity; Nitrogen; Voltage;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference Record, 1995., 1995 IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-3180-X
DOI :
10.1109/NSSMIC.1995.504272
