Speaker
Description
The proximity-focusing Ring Imaging Cherenkov detector, known as pfRICH, is an important particle identification detector in the ePIC experiment at the Electron-Ion Collider. To ensure reliable detector performance over long-term operation, a laser monitoring system is being developed as an independent in-situ calibration tool. This system is designed to monitor possible changes in the detector response caused by optical misalignment, photon detection instability, aging of components, or variation in light collection efficiency. In this study, an optical simulation of the laser monitoring configuration is performed using TracePro to evaluate the photon coverage on the HRPPD sensor plane. Different diffuser configurations are tested to study how the diffuser opening angle affects the light distribution across the detector plane. The simulation results show that increasing the diffuser opening angle improves the photon coverage, with coverage values of 65.68%, 81.22%, and 93.37% for 41°, 47°, and 52° configurations, respectively. Although the 52° configuration provides the highest coverage, the 47° configuration offers a practical balance between optical performance and production feasibility. Therefore, the laser monitoring system provides a promising approach for maintaining stable detector calibration and supporting the long-term performance of the pfRICH detector.