A gas monitor for the ATLAS Muon Spectrometer precision chambers

Author

Levin, Daniel S. ; Amram, Nir ; Ben Moshe, Meny ; Benhammou, Yan ; Dai, Tiesheng ; Diehl, Edward B. ; Etzion, Erez ; Ferretti, Claudio ; Gregory, Jeffery ; Kiesel, M. ; Thun, Rudi ; Weaverdyck, Curtis ; Wilson, Alan ; Zhou, Bing

Author_Institution

Univ. of Michigan, Ann Arbor

Volume

1

fYear

2007

fDate

Oct. 26 2007-Nov. 3 2007

Firstpage

569

Lastpage

573

Abstract

The ATLAS Muon Spectrometer incorporates some 354,000 drift tubes assembled into 1200 monitored drift tube (MDT) precision chambers, with a total gas volume of 723,000 dm³. A gas mixture of 93% Ar and 7% CO₂ at 3 bar flows in a parallel feed at a rate of one chamber volume per day. Achieving the 80 mum single drift tube design resolution requires stringent gas quality control. We report on the design and initial performance of a dedicated MDT mini-chamber conceived for continuous monitoring of the ATLAS Muon Spectrometer MDT system operating gas. This chamber enables measurement of the drift spectra from which gas properties relevent to MDT calibrations are determined.

Keywords

calibration; drift chambers; particle spectrometers; ATLAS muon spectrometer; Ar; CO₂; MDT calibrations; MDT minichamber; drift spectra; gas mixture; gas monitor; gas quality control; monitored drift tube precision chambers; Anodes; Argon; Calibration; Electrons; Magnetic field measurement; Mesons; Monitoring; Spatial resolution; Spectroscopy; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2007. NSS '07. IEEE

Conference_Location

Honolulu, HI

ISSN

1095-7863

Print_ISBN

978-1-4244-0922-8

Electronic_ISBN

1095-7863

Type

conf

DOI

10.1109/NSSMIC.2007.4436396

Filename

4436396