Drift time measurement in the ATLAS liquid argon electromagnetic calorimeter using cosmic muons

G. Aad..[et al.]; Mogens Dam; Jørgen Beck Hansen; John Renner Hansen; Jørn Dines Hansen; Peter Henrik Hansen; Stefania Xella; Esben Bryndt Klinkby; Björn Stefan Nilsson

doi:10.1140/epjc/s10052-010-1403-6

Drift time measurement in the ATLAS liquid argon electromagnetic calorimeter using cosmic muons

G. Aad..[et al.], Mogens Dam, Jørgen Beck Hansen, John Renner Hansen, Jørn Dines Hansen, Peter Henrik Hansen, Stefania Xella, Esben Bryndt Klinkby, Björn Stefan Nilsson

10 Citations (Scopus)

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.

Original language	English
Journal	European Physical Journal C
Volume	70
Issue number	3
Pages (from-to)	755-785
Number of pages	30
ISSN	1434-6044
DOIs	https://doi.org/10.1140/epjc/s10052-010-1403-6
Publication status	Published - 1 Dec 2010

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title = "Drift time measurement in the ATLAS liquid argon electromagnetic calorimeter using cosmic muons",

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 (0.290.040.05)% in the barrel and (0.540.040.06)% 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.",

author = "{Aad..[et al.]}, G. and Mogens Dam and Hansen, {J{\o}rgen Beck} and Hansen, {John Renner} and Hansen, {J{\o}rn Dines} and Hansen, {Peter Henrik} and Stefania Xella and Klinkby, {Esben Bryndt} and Nilsson, {Bj{\"o}rn Stefan}",

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doi = "10.1140/epjc/s10052-010-1403-6",

language = "English",

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TY - JOUR

T1 - Drift time measurement in the ATLAS liquid argon electromagnetic calorimeter using cosmic muons

AU - Aad..[et al.], G.

AU - Dam, Mogens

AU - Hansen, Jørgen Beck

AU - Hansen, John Renner

AU - Hansen, Jørn Dines

AU - Hansen, Peter Henrik

AU - Xella, Stefania

AU - Klinkby, Esben Bryndt

AU - Nilsson, Björn Stefan

PY - 2010/12/1

Y1 - 2010/12/1

N2 - 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 (0.290.040.05)% in the barrel and (0.540.040.06)% 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.

AB - 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 (0.290.040.05)% in the barrel and (0.540.040.06)% 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.

U2 - 10.1140/epjc/s10052-010-1403-6

DO - 10.1140/epjc/s10052-010-1403-6

M3 - Journal article

SN - 1434-6044

VL - 70

SP - 755

EP - 785

JO - The European Physical Journal C: Particles and Fields

JF - The European Physical Journal C: Particles and Fields

IS - 3

ER -

Drift time measurement in the ATLAS liquid argon electromagnetic calorimeter using cosmic muons

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