Drift time measurement in the ATLAS liquid argon electromagnetic calorimeter using cosmic muons
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Drift time measurement in the ATLAS liquid argon electromagnetic calorimeter using cosmic muons. / Aad..[et al.], G.; Dam, Mogens; Hansen, Jørgen Beck; Hansen, John Renner; Hansen, Jørn Dines; Hansen, Peter Henrik; Xella, Stefania; Klinkby, Esben Bryndt; Nilsson, Björn Stefan.
In: European Physical Journal C, Vol. 70, No. 3, 01.12.2010, p. 755-785.Research output: Contribution to journal › Journal article › Research › peer-review
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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 (0.29^{+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.
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 (0.29^{+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.
U2 - 10.1140/epjc/s10052-010-1403-6
DO - 10.1140/epjc/s10052-010-1403-6
M3 - Journal article
VL - 70
SP - 755
EP - 785
JO - The European Physical Journal C: Particles and Fields
JF - The European Physical Journal C: Particles and Fields
SN - 1434-6044
IS - 3
ER -
ID: 32953730