NDLI: Gas performance of the ATLAS MDT precision chambers

Content Provider	IEEE Xplore Digital Library
Author	Amram, N. Levin, D. S. Benhammou, Y. ben Moshe, M. Dai, T. Diehl, E. Eppig, A. Etzion, E. Ferretti, C. Gregory, J. Thun, R. Wilson, A. Weaverdyck, C. Zhou, B.
Copyright Year	2008
Description	Author affiliation: Department of Physics, University of Michigan, USA (Levin, D. S.; Dai, T.; Diehl, E.; Eppig, A.; Ferretti, C.; Gregory, J.; Thun, R.; Wilson, A.; Weaverdyck, C.; Zhou, B.) \|\| Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Israel (Amram, N.; Benhammou, Y.; ben Moshe, M.; Etzion, E.)
Abstract	The ATLAS Muon spectrometer contains more than 350,000, Monitored Drift Tubes (MDTs). The tubes are three cm diameter, one to six meter length, and filled with a three bar mixture of Ar/CO. As the MDT operation is very sensitive to changes in gas composition and environmental conditions, monitoring changes in these parameters is crucial to attain the required MDT spatial resolution of 80 microns. The Michigan-Tel Aviv gas monitoring system is a mini MDT chamber located in the ATLAS gas facility at CERN. The system monitors simultaneously the input feed and exhaust gas to the complete MDT system. By monitoring these two lines it is sensitive to changes of about 1 part per mil to the internal MDT gas composition, and consequently to the drift time to drift radius calibration. As such the system has an important role in the MDT calibration chain. The mini-chamber acquires cosmic ray muon data and monitors continuously the drift times, gas flow rates, temperature and pressure, as well as deriving the radius-time (RT) relations of the drift-tubes. Results of the monitoring are published hourly. This system has been in operation since August 2007. We present a one-year analysis of the results and their correspondence to ambient conditions in the ATLAS cavern as well as interventions in the ATLAS gas facility, demonstrating the sensitivity of the system.
Starting Page	3213
Ending Page	3217
File Size	5426091
Page Count	5
File Format	PDF
ISBN	9781424427147
ISSN	10957863
DOI	10.1109/NSSMIC.2008.4775032
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-19
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Mesons Spectroscopy Calibration Argon Condition monitoring Temperature Nonhomogeneous media Tungsten Anodes Physics
Content Type	Text
Resource Type	Article

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A gas monitor for the ATLAS Muon Spectrometer precision chambers

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