Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons
Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons
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DOI：
10.1140/epjc/s10052-010-1403-6
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发表时间：
2010-12-01
影响因子：
4.4
通讯作者：
Zutshi, V.
中科院分区：
文献类型：
--
作者：
Aad, G.;Abbott, B.;Zutshi, V.
利用宇宙介子对ATLAS电磁量热计液氩中的电离信号进行了详细的研究。特别是，测量了电离电子的漂移时间，并用它来评估量热计间隙的固有均匀性，并估计其对能量分辨率常数项的影响。量热计第二层电池中电子的漂移次数均匀，在筒体中为1.3%，在端帽中为2.8%。这导致估计贡献的常数项在枪管中为(0.29(-0.04)(+0.05))%，在端帽中为(0.54(-0.04)(+0.06))%。在88.5 K和1 kV/mm条件下，电离电子的漂移速度为4.61 +/- 0.07 mm/ μ s。
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.