NDLI: Study of ATLAS monitored drift tube flushing

Content Provider	IEEE Xplore Digital Library
Author	Bratzler, U. Forbush, D.A. Mockett, P.M. Twomey, M.S.
Copyright Year	2004
Description	Author affiliation: Dept. of Phys., CERN, Geneva, Switzerland (Bratzler, U.)
Abstract	The ATLAS monitored drift tube (MDT) muon tracking detector system consists of about 1,200 large-scale MDT chambers built from some 400,000 individual aluminum tubes of 3 cm diameter, and lengths ranging from approximately 1 to 6 meters. This MDT system has a total gas volume of 800 m/sup 3/. Both during the many years of chamber preparation, testing, commissioning and after their later installation in ATLAS, the chamber gas has to be refreshed or replaced periodically. In cases where the chamber gas shall be replaced, it would be of great advantage (cost, time) to know how to remove the old gas in the most efficient manner. Frequently chambers are pressurized and then depressurized three or more times. We have examined an alternate method of just flushing at atmospheric pressure and determined how many 'volume exchanges' of gas are needed until the 'new gas' will have replaced the 'old gas' during the flushing process to a very high degree of purity. It is shown that after 1.8 volume exchanges (perhaps even less) at atmospheric pressure the gas is replaced at the 99.9%-level. Results of these studies and a method of visualization of the flushing process, shown in real-time, how the old gas is replaced by the new gas in an MDT-like setup, are presented.
Starting Page	569
Ending Page	571
File Size	662955
Page Count	3
File Format	PDF
ISBN	0780387007
ISSN	10823654
e-ISBN	0780387015
DOI	10.1109/NSSMIC.2004.1462259
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-10-16
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Monitoring Testing Physics Visualization Costs Argon Radiation detectors Mesons Large-scale systems Aluminum
Content Type	Text
Resource Type	Article

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