The performance of the ATLAS Forward Proton Time-of-Flight (ToF) Cherenkov detector is studied using the ATLAS data collected in 2017 during the LHC Run2. The detailed analysis of the results, including detector efficiency and time resolution of the ToF detector, is discussed. The detector construction and its expected performance based on beam test results are briefly summarized first. Operational experiences are presented. They include problems due to attempts to operate Micro-Channel Plate Photomultiplier Tubes (MCP-PMTs) in the vacuum, leading to changes in the detector construction. In addition, a new MCP-PMT design was needed, as a result of the observed gain drop for high rates and its non-recoverability. Also, other hardware changes are presented— the effect of the replacement of glued crystal bars by monolithic ones, as well as the change of the MCP-PMT back-end electronics, based on simulation to reduce signal cross-talk resulting in further ...

中文翻译：

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ATLAS前向质子飞行时间检测器：LHC Run2的性能和体验

使用LHC Run2期间2017年收集的ATLAS数据研究了ATLAS前向质子飞行时间（ToF）Cherenkov检测器的性能。讨论了结果的详细分析，包括ToF检测器的检测器效率和时间分辨率。首先简要总结了基于光束测试结果的探测器结构及其预期性能。介绍了操作经验。其中包括由于试图在真空中操作微通道板光电倍增管（MCP-PMT）而导致的问题，从而导致检测器结构发生变化。另外，由于观察到高速率的增益下降及其不可恢复性，因此需要一种新的MCP-PMT设计。此外，还提出了其他硬件更改-用整体式替换胶合的晶体棒的效果，