The Performance and Upgrade of RPC System for CMS during LHC RUN-1 and RUN-2

Abstract

The Resistive Plate Chamber (RPC) is a gaseous detector that is widely used in the experiments of the Large Hadron Collider (LHC) as a muon trigger due to excellent time resolution ( 1 ns) and high rate capability ( kHz/cm2). The LHC, being a particle collider, is capable of accelerating protons at the energy scale of TeV to verify predictions of the Standard Model and beyond. In many physics processes, particles like W, Z, and Higgs are not directly detectable but their decay into muon particles provides a possibility to be detected indirectly. One of the LHC experiments is the Compact Muon Solenoid (CMS) built to detect various particles from the LHC collisions. For the detection and triggering of muon particles, the CMS uses various detectors with di erent technologies that form the CMS muon system. The RPCs are part of the CMS muon system and cover a large area of the CMS experiment for the detection of muon particles. The huge system of the RPCs should exhibit a stable performance to get quality data to study various physics processes during the proton-proton collisions at the LHC. The thesis is focused on the RPC system and its performance during the rst two collision runs called Run-1 and Run-2 of the LHC. The major task was to upgrade the CMS endcap RPCs between the collision runs which is also discussed in detail