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 ve- locity 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.

Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons / G., A., B., A., J., A., A. A., A., A., A., O., A., B., A., M., A., H., A., H., A., B. S., A., D. L., A., T. N., A., J., A., C., A., P., A., T., A., S., A., J. A., A.S., M., A., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 70:(2010), pp. 755-785. [10.1140/epjc/s10052-010-1403-6]

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

BAGNAIA, Paolo;BINI, Cesare;DI DOMENICO, Antonio;DIONISI, Carlo;GAUZZI, Paolo;GENTILE, Simonetta;GIAGU, Stefano;M. Kado;LACAVA, Francesco;LUCI, Claudio;MESSINA, Andrea;A. Policicchio;SOLFAROLI CAMILLOCCI, ELENA;
2010

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+0.05 −0.04)% in the barrel and (0.54+0.06 −0.04)% in the endcaps. The same data are used to measure the drift ve- locity 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.
2010
01 Pubblicazione su rivista::01a Articolo in rivista
Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons / G., A., B., A., J., A., A. A., A., A., A., O., A., B., A., M., A., H., A., H., A., B. S., A., D. L., A., T. N., A., J., A., C., A., P., A., T., A., S., A., J. A., A.S., M., A., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 70:(2010), pp. 755-785. [10.1140/epjc/s10052-010-1403-6]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/401819
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