Readiness of the ATLAS liquid argon calorimeter for LHC collisions
Readiness of the ATLAS liquid argon calorimeter for LHC collisions
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DOI：
10.1140/epjc/s10052-010-1354-y
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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.
ATLAS液氩量热仪自2006年8月起一直持续运行。此时，只有部分量热仪有读数，但自2008年初以来，所有量热仪单元均已连接至ATLAS读出系统，为LHC碰撞做准备。本文概述了使用随机触发器、校准数据、宇宙 μ 子和大型强子对撞机光束飞溅事件现场测量的液氩量热仪的性能。给出了探测器操作、定时性能、电子噪声和增益稳定性的结果。辐射宇宙 μ 子和束流溅射事件产生的高能沉积允许检查能量分辨率的固有常数项。电磁筒热量计响应沿 eta（对 phi 求平均值）的均匀性是使用最小电离宇宙 μ 子以百分比水平测量的。最后，对辐射 μ 子电磁簇射的研究已用于交叉检查蒙特卡罗模拟。使用 ATLAS 读数、数据采集和重建软件获得的性能结果表明，液氩量热仪已为大型强子对撞机时代初期的碰撞做好了充分准备。
The ATLAS liquid argon calorimeter has been operating continuously since August 2006. At this time, only part of the calorimeter was readout, but since the beginning of 2008, all calorimeter cells have been connected to the ATLAS readout system in preparation for LHC collisions. This paper gives an overview of the liquid argon calorimeter performance measured in situ with random triggers, calibration data, cosmic muons, and LHC beam splash events. Results on the detector operation, timing performance, electronics noise, and gain stability are presented. High energy deposits from radiative cosmic muons and beam splash events allow to check the intrinsic constant term of the energy resolution. The uniformity of the electromagnetic barrel calorimeter response along eta (averaged over phi) is measured at the percent level using minimum ionizing cosmic muons. Finally, studies of electromagnetic showers from radiative muons have been used to cross-check the Monte Carlo simulation. The performance results obtained using the ATLAS readout, data acquisition, and reconstruction software indicate that the liquid argon calorimeter is well-prepared for collisions at the dawn of the LHC era.