Aging study on Resistive Plate Chambers of the CMS Muon Detector for HL-LHC

During the phase II of the LHC physics program, called High Luminosity LHC (HL-LHC), the accelerator will increase the instantaneous luminosity up to 5\(\times 10^{34}\, \text {cm}^{-2}\, \text {s}^{-1}\). At HL-LHC, the CMS Resistive Plate Chambers (RPC) system will be subjected to high background radiations which could induce non-recoverable aging effects and can alter the detector properties. A new longevity test is then needed to estimate the impact of HL-LHC conditions up to an integrated charge equivalent to the integrated luminosity of 3000 \(\text {fb}^{-1}\), to confirm that the RPC system will survive the harsher background conditions. A dedicated consolidation program is ongoing at the CERN Gamma Irradiation Facility (GIF++), where a few RPC detectors are exposed to intense gamma radiation. The main detector parameters (currents, rate, and resistivity) are under monitoring as a function of the integrated charge and the performance studied with a muon beam. After having collected a significant amount of the total irradiation, preliminary results will be presented.