Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons

Article Article scientifique Article Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons eng 2010 collaborator Abdelalim Aly Ahmed Aly 641568 collaborator Alexandre Gauthier 660232 collaborator Backes Moritz 662631 collaborator Bell William 683675 collaborator Berglund Frida Elina 677400 collaborator Blondel Alain 133489 collaborator Bucci Francesca 656350 collaborator Clark Allan Geoffrey 24043 collaborator Dao Valerio 686374 collaborator Ferrere Didier 507742 collaborator Gadomski Szymon 652516 collaborator Garcia Navarro Jose Enrique 668256 collaborator Gaumer Olivier 628987 collaborator Gonzalez Sevilla Sergio 680902 collaborator Goulette Marc 706586 collaborator Hamilton Andrew 644888 collaborator Keil Markus 652104 collaborator Lister Alison 134321 collaborator Martin Dit Latour Bertrand 685503 collaborator Mora Herrera Maria Clemencia Rosario 662897 collaborator Pasztor Arpad 0000-0001-8230-235X 814093 collaborator Robichaud-Veronneau Andrée 636055 collaborator Rosselet Laurent 21992 collaborator Thananuwong Raksapol 661801 collaborator Urquijo Phillip 666014 collaborator Wu Xin 27612 ATLAS Collaboration 755-785 10.1140/epjc/s10052-010-1403-6 1434-6044 http://link.springer.com/article/10.1140%2Fepjc%2Fs10052-010-1403-6 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/μs at 88.5 K and 1 kV/mm. Dewey 500.2 34 Département de physique nucléaire et corpusculaire 132 false European physical journal. C, Particles and fields 70 3 63f881a2-50c0-453c-9968-e7e2afce2e23 Article (Published version) Public Pohl112.pdf 1857821 application/pdf openAccess Faculté des sciences / Section de physique / Département de physique nucléaire et corpusculaire

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Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons	European physical journal. C, Particles and fields			2010	566	298

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