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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



ID: 544557.0, MPI für Physik / MPI für Physik
Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons
Authors:The ATLAS Collaboration
Date of Publication (YYYY-MM-DD):2010
Title of Journal:European Physical Journal C
Journal Abbrev.:Eur.Phys.J.C
Issue / Number:70
Start Page:755
End Page:785
Audience:Not Specified
Intended Educational Use:No
Abstract / Description: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 +0.05 -0.04) % in the barrel and (0.54 +0.06 -0.04) % 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/\mu s at 88.5 K and 1 kV/mm.
Classification / Thesaurus:ATLAS
Comment of the Author/Creator:32 pages, 25 figures, submitted to EPJC
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2010-248
URL:http://cdsweb.cern.ch/record/1244611?ln=en
URL:http://arXiv.org/abs/arxiv:1002.4189
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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