ATLAS μ子谱仪在CERN SPS的H8束中的系统测试
System Test of the ATLAS Muon Spectrometer in the H8 Beam at the CERN SPS
摘要：
在过去的四年中，在CERN SPS的H8束线上对ATLAS μ子谱仪进行了广泛的系统测试。该光谱仪将使用加压的连续漂移管（MDT）室和阴极剥离室（CSC）进行精确跟踪，电阻板室（RPC）用于在筒中触发，薄间隙室（TGCs）用于在端盖区域触发。测试装置模拟了枪管的一个投影塔（六个MDT腔室和六个RPC）和一个端盖八分仪（六个MDT腔室，一个CSC和三个TGCs）。机筒和端盖支架还配备了光学对准系统，旨在将每个塔中的精密腔室相对定位到30-40微米。除了探测器的性能和校准方案，ATLAS μ子谱仪的许多其他系统方面已经过测试和验证，如机械探测器集成和安装，探测器控制系统，数据采集，高电平触发软件和离线事件重建。测量的μ子能量范围从20到300 GeV允许测量触发和跟踪性能的设置，在配置非常类似的最终光谱仪。采用一种束团间距为25 ns的特殊聚束μ子束，模拟LHC的聚束结构，研究了触发室的时间分辨率和聚束识别性能。ATLAS第一级触发链首次使用μ子触发信号运行。
英文摘要：
An extensive system test of the ATLAS muon spectrometer has been performed in the H8 beam line at the CERN SPS during the last four years. This spectrometer will use pressurized Monitored Drift Tube (MDT) chambers and Cathode Strip Chambers (CSC) for precision tracking, Resistive Plate Chambers (RPCs) for triggering in the barrel and Thin Gap Chambers (TGCs) for triggering in the end-cap region. The test set-up emulates one projective tower of the barrel (six MDT chambers and six RPCs) and one end-cap octant (six MDT chambers, A CSC and three TGCs). The barrel and end-cap stands have also been equipped with optical alignment systems, aiming at a relative positioning of the precision chambers in each tower to 30-40 micrometers. In addition to the performance of the detectors and the alignment scheme, many other systems aspects of the ATLAS muon spectrometer have been tested and validated with this setup, such as the mechanical detector integration and installation, the detector control system, the data acquisition, high level trigger software and off-line event reconstruction. Measurements with muon energies ranging from 20 to 300 GeV have allowed measuring the trigger and tracking performance of this set-up, in a configuration very similar to the final spectrometer. A special bunched muon beam with 25 ns bunch spacing, emulating the LHC bunch structure, has been used to study the timing resolution and bunch identification performance of the trigger chambers. The ATLAS first-level trigger chain has been operated with muon trigger signals for the first time.
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