Speaker
Description
The CMS muon system is being upgraded in preparation for the High-Luminosity LHC (HL-LHC), where significantly higher particle rates and radiation levels are expected. As part of this upgrade, 72 Improved Resistive Plate Chambers (iRPCs) in total will be installed in the RE3/1 and RE4/1 stations of the endcap muon system to maintain efficient muon triggering and reconstruction in the forward region. Following the completion of the detector design and qualification phase, the iRPC project has entered the final stages of mass production, assembly, and detector validation. A comprehensive quality assurance program has been established to guarantee detector performance and long-term operational stability. The overall performance was checked in the CERN Gamma Irradiation Facility to confirm our parameters with a safety factor 3. The quality control chain includes component validation, gas gap certification, chamber assembly tests, long-term high-voltage stability measurements, electronics verification, and cosmic-ray performance studies. This contribution presents an overview of the iRPC production campaign and summarizes the results obtained from the quality control procedures performed on the assembled chambers. Detector performance is evaluated through high-voltage scans and cosmic-ray measurements, including efficiency, working point determination, dark current behavior, and cluster size characterization. The distributions of these key performance indicators are analyzed for the full production sample and compared with the detector requirements established for HL-LHC operation. The results demonstrate a high level of uniformity among the produced chambers and confirm that the detectors satisfy the performance specifications required for installation in CMS. The status of the production and validation campaign is reviewed, together with the lessons learned from large-scale detector construction and testing. These results represent an important milestone toward the successful deployment of the iRPC system for the CMS Phase-II Upgrade.