The PPS (Precision Proton Spectrometer) system consists of tracking and timing detectors installed along the LHC beam line between 210 and 220 m from the interaction point on both sides of the CMS experiment. The aim of the apparatus is to measure with high precision the position, direction and time-of-flight of protons which emerge intact from the pp collision. Fully integrated in the CMS data acquisition system, PPS has taken data at high luminosity during the years of the LHC Run2 (2016–2018), with slightly different detector configurations. The tracking system consists of 4 detector stations (two per side) and was instrumented with edgeless silicon strips (2016–2017) and 3D pixel sensors bump-bonded to the PSI46dig ROC (2017–2018). In this contribution, commissioning, operation and performance of the PPS tracking system during Run2 will be discussed, with focus on the challenges posed by operating the detectors at few millimeters from the beam, in highly non-uniform irradiation environment. Prospects for LHC Run3 will be also presented.

中文翻译：

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PPS 跟踪系统：LHC Run2 的性能和 LHC Run3 的前景

PPS（精密质子光谱仪）系统由沿 LHC 光束线安装的跟踪和定时探测器组成，距离 CMS 实验两侧的相互作用点 210 至 220 m。该设备的目的是高精度测量从 pp 碰撞中完好无损地出现的质子的位置、方向和飞行时间。PPS 完全集成在 CMS 数据采集系统中，在 LHC Run2（2016-2018 年）期间以高亮度采集数据，探测器配置略有不同。跟踪系统由 4 个探测器站（每侧两个）组成，并配备无边硅条（2016-2017）和凸焊到 PSI46dig ROC（2017-2018）的 3D 像素传感器。在这个贡献中，调试，将讨论 Run2 期间 PPS 跟踪系统的操作和性能，重点是在高度不均匀的辐照环境中在距离光束几毫米处操作探测器所带来的挑战。还将介绍 LHC Run3 的前景。