Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Instrumentation IV

HK 11.6: Vortrag

Montag, 10. März 2025, 18:00–18:15, SR Exp1B Chemie

A SiPM-based Ring Imaging Cherenkov detector at CBM. — •Jesus Peña-Rodríguez, Christian Pauly, Jörg Försch, and Karl-Heinz Kampert for the CBM collaboration — Fakultät für Mathematik und Naturwissenschaften, Bergiche Universität Wuppertal, Gausstrasse 20, 42119 Wuppertal, Deutschland

The Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR) will study the phase diagram of strongly interacting matter at high densities and moderate temperatures. CBM features a Ring Imaging Cherenkov (RICH) detector for electron detection. The RICH detector will have two photon cameras comprised of Multi-Anode Photomultipliers (MAPMTs), two spherical glass mirrors as focusing elements, and a CO2 radiator gas. In recent years, Cherenkov detectors have been moving toward new photodetection technologies to improve timing, spatial, and amplitude resolutions. Silicon photomultipliers (SiPMs) measure single-photon light intensities with picosecond timing precision, photodetection efficiencies up to 50%, and magnetic field immunity. However, SiPM drawbacks, such as a strong temperature dependence and high dark count rates, make their use challenging in RICH detectors featuring low-rate single-photon signals. We present the implementation and characterization of an 8x8 SiPM (AFBR-S4N66P024M) array adapted to the readout electronics of the CBM RICH. In addition, we evaluate the SiPM radiation hardness under different doses taking into account the radiation levels expected in the CBM photon cameras.

Keywords: Silicon Photomultipiers; Radiation hardness; Ring Imaging Cherekov detector; Multi-anode Photomultipliers