Speaker
Description
The Resistive Plate Chamber (RPC) system of the CMS experiment has been operating successfully since the beginning of LHC data taking. The prolonged exposure to radiation backgrounds throughout Run 1, Run 2, and Run 3 provides a unique opportunity to assess the long-term behavior of the CMS RPC detectors and to evaluate their expected performance throughout the High-Luminosity LHC (HL-LHC) programme. Since last analysis performed in 2017, the CMS RPC system has accumulated approximately eight additional years of operation, more than doubling the dataset available for charge accumulation studies. To support long-term monitoring, a dedicated automation framework has been developed and deployed. The framework retrieves detector current information, computes the integrated charge contribution every four hours, and automatically stores the accumulated charge of each chamber on a daily basis. This approach provides a complete and continuously updated chamber-by-chamber history of the detector exposure and significantly simplifies long-term performance studies. The enlarged dataset enables improved data-driven extrapolations of the accumulated charge expected at an integrated luminosity of 3000 fb^(-1). The extrapolations are obtained from fits to the measured charge evolution and are used to identify the detector regions expected to receive the highest exposure during HL-LHC operation. In addition, the study presents the current accumulated charge measured throughout the CMS RPC system and provides detailed radial and azimuthal charge distributions for all chambers. The measured charge evolution and HL-LHC projections are being discussed.