Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 38: Methods in Astroparticle Physics II

T 38.2: Vortrag

Dienstag, 17. März 2026, 16:30–16:45, KS 00.004

Developing a Cryogenic SiPM Characterization Setup — •Nicolas Krieger, Andreas Leonhardt, Stefan Schönert, and Mario Schwarz — Department of Physics, TUM School of Natural Sciences, Technical University of Munich, 85748 Garching b. München, Germany

Silicon photomultipliers (SiPMs) are promising photodetectors for liquid noble gas detectors, which impose challenging cryogenic and vacuum-ultraviolet conditions. Understanding SiPM behavior in this environment is crucial, given the strong temperature dependence of key performance parameters, such as the dark count rate (DCR), breakdown voltage (V_bd), gain, photon detection efficiency (PDE), crosstalk, and afterpulsing. We developed a dedicated SiPM characterization setup inside a temperature-controlled vacuum chamber (300-40K) and present the main challenges in achieving stable SiPM operation and readout. The vacuum environment enables systematic measurements over a wide temperature range and rapid sample turnaround, both of which are not accessible in liquid noble gas setups. Finally, we present temperature-dependent SiPM performance measurements, which will support ongoing studies of SiPM behavior for the LEGEND experiment. We acknowledge support from the Deutsche Forschungsgemeinschaft and through the Sonderforschungsbereich SFB 1258.

Keywords: Silicon photomultiplier (SiPM); Cryogenic photodetectors; Liquid noble gas detectors; LEGEND