HL-LHC ATLAS μ子探测器升级用密歇根sMDT原型室的性能
Performance of Michigan sMDT Prototype Chambers for the HL-LHC ATLAS Muon Detector Upgrade
摘要：
为ATLAS实验的μ子谱仪开发了一种新的小直径湍流漂移管（sMDT）室，以处理CERN高亮度大型强子对撞机（HL-LHC）预期的更高碰撞率。本文介绍了在密歇根大学建造的两个原型sMDT室的跟踪分辨率和命中效率的测量。使用宇宙射线μ子的sMDT跟踪分辨率为103.7 $\pm8.1$ \textmu m测量的一个室和101.8 $\pm$ 7.8 \textmu m的其他相比，设计分辨率为106 \textmu m。进一步的跟踪分辨率提高到83.4 $\pm$ 7.8 \textmu m，获得了通过使用新的高增益读出电子，这将被添加到HL-LHC。发现两个腔室的平均跟踪效率为（98.5 $\pm$ 0.2）\%。详细介绍了用于确定探测器跟踪分辨率和效率的方法，包括重建sMDT数据和Geant 4模拟试验室。
英文摘要：
A new small-diameter Monitored Drift Tube (sMDT) chamber has been developed for the muon spectrometer of the ATLAS experiment to handle the higher collision rates expected at the CERN High Luminosity Large Hadron Collider (HL-LHC). This paper presents measurements of the tracking resolution and hit efficiency of two prototype sMDT chambers constructed at the University of Michigan. Using cosmic-ray muons the sMDT tracking resolution of 103.7$\pm8.1$ \textmu m was measured for one chamber and 101.8$\pm$7.8 \textmu m for the other, compared with a design resolution of 106 \textmu m. A further tracking resolution improvement to 83.4$\pm$7.8 \textmu m was obtained by using new high-gain readout electronics which will be added for HL-LHC. An average tracking efficiency of (98.5$\pm$0.2)\% was found for both chambers. The methodology used to determine the detector tracking resolution and efficiency, including reconstruction of sMDT data and a Geant4 simulation of the test chamber, is presented in detail.
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