Performance of the RPC-based ALICE muon trigger system at the LHC
Performance of the RPC-based ALICE muon trigger system at the LHC
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DOI：
10.1088/1748-0221/7/12/t12002
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发表时间：
2012-12-01
影响因子：
1.3
通讯作者：
Marchisone, M.
中科院分区：
文献类型：
--
作者：
Bossu, F.;Gagliardi, M.;Marchisone, M.
ALICE（A Large Ion Collider Experiment）的前向μ子谱仪配备了由电阻板室（RPC）的四个平面组成的触发系统，每个平面布置在两个站点中，总面积约为140 m（2）。该系统提供了具有合适的横向动量选择的单μ子和双μ子触发器，针对夸克偶素和开放重味的物理学进行了优化。在大型强子对撞机数据采集的前两年（2010年和2011年），72个RPC在pp和Pb-Pb碰撞中都以高度饱和的雪崩模式运行。积分电荷平均约为1.3 mC/cm（2），对于暴露最多的探测器为3.5 mC/cm（2）。本文描述了两个主要结果。第一个结果是RPC性能的确定，特别关注的主要检测器参数，如效率，暗电流和暗速率的稳定性。第二个结果是测量的μ子触发性能在铅铅碰撞在根sNN = 2.76 TeV，在触发决策逻辑的可靠性和稳定性。
The forward muon spectrometer of ALICE (A Large Ion Collider Experiment) is equipped with a trigger system made of four planes of Resistive Plate Chambers (RPC), arranged in two stations with two planes each, for a total area of about 140 m(2). The system provides single and di-muon triggers with suitable transverse momentum selection, optimised for the physics of quarkonia and open heavy flavour. In the first two years of data-taking at the Large Hadron Collider (2010 and 2011) the 72 RPCs were operated in highly saturated avalanche mode in both pp and Pb-Pb collisions. The integrated charge was about 1.3 mC/cm(2) on average and 3.5 mC/cm(2) for the most exposed detectors. This paper describes two main results. The first result is the determination of the RPC performance, with particular focus on the stability of the main detector parameters such as efficiency, dark current, and dark rate. The second result is the measurement of the muon trigger performance in Pb-Pb collisions at root sNN = 2.76 TeV, in terms of the reliability and stability of the trigger decision logic.