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Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
Univ Michigan, Dept Phys, Ann Arbor.ORCID iD: 0000-0002-8913-0981
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2010 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 70, no 3, 755-785 p.Article in journal (Refereed) Published
Abstract [en]

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/mu s at 88.5 K and 1 kV/mm.

Place, publisher, year, edition, pages
2010. Vol. 70, no 3, 755-785 p.
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-29551DOI: 10.1140/epjc/s10052-010-1403-6ISI: 000285200000012ScopusID: 2-s2.0-79651474032OAI: diva2:395597
Swedish Research CouncilKnut and Alice Wallenberg Foundation
QC 20110207Available from: 2011-02-07 Created: 2011-02-07 Last updated: 2012-02-14Bibliographically approved

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Grahn, Karl-JohanLund-Jensen, BengtStrandberg, JonasLafaye, Remi
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