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Online precision gas evaluation of the ATLAS Muon Spectrometer during LHC Run1

The ATLAS Muon Spectrometer, a six story structure embedded in a toroidal magnetic field, is constructed of nearly 1200 Monitored Drift Tube chambers (MDTs) containing 354,000 aluminum drift tubes. The operating gas is 93% Ar + 7% CO${_2}$ with a small amount of water vapor at a pressure of 3 bar. T...

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Autor principal: Geng, Cong
Lenguaje:eng
Publicado: 2014
Materias:
Acceso en línea:https://dx.doi.org/10.1109/NSSMIC.2014.7431058
http://cds.cern.ch/record/1972646
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author Geng, Cong
author_facet Geng, Cong
author_sort Geng, Cong
collection CERN
description The ATLAS Muon Spectrometer, a six story structure embedded in a toroidal magnetic field, is constructed of nearly 1200 Monitored Drift Tube chambers (MDTs) containing 354,000 aluminum drift tubes. The operating gas is 93% Ar + 7% CO${_2}$ with a small amount of water vapor at a pressure of 3 bar. The momentum resolution required for ATLAS physics demands that MDT gas quality and the associated gas dependent calibrations be determined with a rapid feedback cycle. During the LHC Run1, more than 2 billion liters of gas flowed through the detector at a rate 100,000 l/hr. Online evaluation of MDT gas in real time and the associated contribution to the determination of the time-to-space functions was conducted by the dedicated Gas Monitor Chamber (GMC). We report on the operation and results of the GMC over the first three years of LHC running. During this period, the GMC has operated with a nearly 100% duty cycle, providing hourly measurements of the MDT drift times with 1 ns precision, corresponding to minute changes in gas composition.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2014
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spelling cern-19726462019-09-30T06:29:59Zdoi:10.1109/NSSMIC.2014.7431058http://cds.cern.ch/record/1972646engGeng, CongOnline precision gas evaluation of the ATLAS Muon Spectrometer during LHC Run1Particle Physics - ExperimentThe ATLAS Muon Spectrometer, a six story structure embedded in a toroidal magnetic field, is constructed of nearly 1200 Monitored Drift Tube chambers (MDTs) containing 354,000 aluminum drift tubes. The operating gas is 93% Ar + 7% CO${_2}$ with a small amount of water vapor at a pressure of 3 bar. The momentum resolution required for ATLAS physics demands that MDT gas quality and the associated gas dependent calibrations be determined with a rapid feedback cycle. During the LHC Run1, more than 2 billion liters of gas flowed through the detector at a rate 100,000 l/hr. Online evaluation of MDT gas in real time and the associated contribution to the determination of the time-to-space functions was conducted by the dedicated Gas Monitor Chamber (GMC). We report on the operation and results of the GMC over the first three years of LHC running. During this period, the GMC has operated with a nearly 100% duty cycle, providing hourly measurements of the MDT drift times with 1 ns precision, corresponding to minute changes in gas composition.ATL-MUON-PROC-2014-012oai:cds.cern.ch:19726462014-11-30
spellingShingle Particle Physics - Experiment
Geng, Cong
Online precision gas evaluation of the ATLAS Muon Spectrometer during LHC Run1
title Online precision gas evaluation of the ATLAS Muon Spectrometer during LHC Run1
title_full Online precision gas evaluation of the ATLAS Muon Spectrometer during LHC Run1
title_fullStr Online precision gas evaluation of the ATLAS Muon Spectrometer during LHC Run1
title_full_unstemmed Online precision gas evaluation of the ATLAS Muon Spectrometer during LHC Run1
title_short Online precision gas evaluation of the ATLAS Muon Spectrometer during LHC Run1
title_sort online precision gas evaluation of the atlas muon spectrometer during lhc run1
topic Particle Physics - Experiment
url https://dx.doi.org/10.1109/NSSMIC.2014.7431058
http://cds.cern.ch/record/1972646
work_keys_str_mv AT gengcong onlineprecisiongasevaluationoftheatlasmuonspectrometerduringlhcrun1