A Study of a Quartz Bar Detector in the Forward Region of the CMS Experiment at LHC

In high rapidity regions of experiments at colliders (e.g. Large Hadron Collider LHC), along the direction of the interacting beams, the conditions are particularly challenging and the detectors need to have excellent time resolution, spatial resolution, high-rate capability and radiation resistance. Among various detector schemes proposed for these applications, combinations of Cherenkov radiators (quartz, sapphire, etc.) with fast photodetectors (e.g. Micro Channel Plate PMT (MCP PMT), Silicon PM (SiPM)) have been studied. Quartz-based calorimeters are already employed at CMS (Compact Muon Solenoid) experiment in the forward direction. Quartz bar array detectors were initially proposed as timing elements for the CT-PPS (CMS-TOTEM Precise Proton Spectrometer) project. We report here on the performance of one of these QUARTIC (QUARtz TIming Cherenkov) detectors, which was installed in 2018 (as test prototype) in the CMS Forward Zone near the CMS beam pipe.