Improved Resistive Plate Chambers for Phase-II upgrade of the CMS detector in LHC

In anticipation of the High Luminosity LHC, an extensive upgrade is underway for the CMS Muon system to ensure its optimal performance in muon triggering and reconstruction. The indispensable role of Resistive Plate Chambers (RPC) as dedicated muon detectors stems from their exceptional timing resolution. To meet the requirements of Phase-II of the LHC, the RPC system will be expanded up to a pseudorapidity of 2.4. The forward Muon system's upcoming RE3/1 and RE4/1 stations will feature improved Resistive Plate Chambers (iRPC). Distinguished by a unique design and geometry, including a 2D strip readout, these iRPCs represent a significant advancement over the current RPC system. The enhancements include the use of thinner electrodes, a narrower 1.4 mm gas gap, and improved Front-End Board (FEB) allowing a 30 fC threshold. Two iRPC chambers were installed in station 3 of CMS during the year end technical stop (YETS) 2023/2024 and other 70 are being assembled at CERN and being prepared for installation next YETS 2024/2025. This paper provides a comprehensive summary of quality control (QC) and future plans for iRPC chambers in CMS detector.