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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Instrumentation VI

HK 35.5: Talk

Thursday, March 19, 2026, 15:00–15:15, PHIL A 301

Trigger system based on time-spatial correlations for SiPM-RICH detectors — •Jesús Peña-Rodríguez for the CBM collaboration — Bergische Universität Wuppertal, Wuppertal, Germany

Future experiments in high-energy physics work on new detection technologies with higher time and spatial resolution. This will enhance data quality to search for specific decay channels or interaction products. Detectors employed for particle identification use different technologies, geometries, and algorithms. Ring Imaging Cherenkov (RICH) detectors are one of them; they record Cherenkov rings from charged particles traversing a radiator medium and discriminate between particles depending on the angle of the Cherenkov emission. New RICH techs explores Silicon Photomultipliers (SiPMs) as photon detectors. SiPMs provide high time resolution, spatial granularity, magnetic field immunity, mechanical robustness, and low material budget. Nevertheless, high dark count rates and low radiation tolerance challenge the implementation of SiPMs in RICH detectors. We explore a trigger system that exploits Cherenkov ring features: spatial correlation (circular/ellipsoidal shape) and time coincidence (picosecond arrival time) of Cherenkov photons. This approach rejects most of the fake events caused by DCR, saving buffer and bandwidth. We performed MC simulations to generate realistic SiPM noise and Cherenkov rings. These signals were injected into the digital implementation (FPGA Lattice ECP5) of the trigger system to evaluate its signal-to-noise ratio and detection efficiency.

Keywords: Trigger system; Ring Imaging Cherenkov; Silicon Photomultiplier