Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons
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Aad2010_Article_DriftTimeMeasurementInTheATLAS.pdf
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1.77 MB
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Adobe PDF
Checksum (MD5)
b2675a6d45825080ec8b44048dff920f
Author(s)
ATLAS Collaboration
Taylor, Frank E
Date Issued
October 2010
Journal
European Physical Journal C: Particles and Fields
Publisher
Springer Nature
Citation
Aad, G. et al. “Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter Using Cosmic Muons.” The European Physical Journal C 70, 3 (October 2010): 755–785 © 2010 CERN for the benefit of the ATLAS collaboration
Version
Final published version
Abstract
The ionization signals in the liquid argon of the ATLAS electromagnetic calorimeter are studied in detail using cosmic muons. In particular, the drift time of the ionization electrons is measured and used to assess the intrinsic uniformity of the calorimeter gaps and estimate its impact on the constant term of the energy resolution. The drift times of electrons in the cells of the second layer of the calorimeter are uniform at the level of 1.3% in the barrel and 2.8% in the endcaps. This leads to an estimated contribution to the constant term of (0.29 0.04 0.05 )% in the barrel and (0.54 0.04 0.06 )% in the endcaps. The same data are used to measure the drift velocity of ionization electrons in liquid argon, which is found to be 4.61±0.07 mm/μs at 88.5 K and 1 kV/mm. Keywords: Calorimeter; Systematic Uncertainty; Drift Velocity; Drift Time; Liquid Argon
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1140/EPJC/S10052-010-1403-6
