Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 85: Methods in astroparticle physics 4
T 85.8: Talk
Thursday, March 7, 2024, 17:45–18:00, Geb. 20.30: 2.067
Measurement-based performance comparison of SiPM and PMT pixels in the MAGIC IACT camera — •Alexander Hahn1, Razmik Mirzoyan1, Antonios Dettlaff1, David Fink1, Daniel Mazin1,2 und Masahiro Teshima1,2 — 1Max Planck Institute for Physics, Garching, Germany — 2Institute for Cosmic Ray Research, The University of Tokyo, Kashiwa City, Japan
All the major Imaging Atmospheric Cherenkov Telescopes (IACTs) in operation, including MAGIC, H.E.S.S., VERITAS, and CTA's LSTs and MSTs, utilize photomultiplier tubes (PMTs) as low light level (LLL) detectors. It has been shown that smaller IACTs, such as FACT and ASTRI, can utilize Silicon photomultipliers (SiPMs) instead. However, whether SiPMs can effectively replace PMTs as light detectors in larger-scale IACTs remains an unresolved question primarily investigated through simulations. We have built several SiPM-based prototype detector modules at the Max Planck Institute for Physics to address this question. Our SiPM detector modules have been installed for several years in one of the two MAGIC cameras and were operated in parallel. This allows us to directly compare the performances of SiPM and PMT-based pixels without added assumptions. Here, we present a multi-year in situ study that covers detector calibration, long-term stability, detection efficiencies, and signal-to-noise ratio comparisons between the two detector types.
Keywords: SiPM; PMT; IACT