Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 64: Experimentelle Techniken der Astroteilchenphysik 3

T 64.5: Talk

Tuesday, March 28, 2017, 17:45–18:00, VSH 18

Design and comparison of a SiPM based detector module to PMT modules in the MAGIC telescopes — •Alexander Hahn¹, David Fink¹, Daniel Mazin^{1, 2}, Razmik Mirzoyan¹, and Masahiro Teshima^{1, 2} for the MAGIC collaboration — ¹Max-Planck-Institut für Physik, München, Deutschland — ²Institute for Cosmic Ray Research, Tokyo, Japan

The MAGIC collaboration operates two Imaging Atmospheric Cherenkov Telescopes (IACTs) with 17 m diameter on the Canary Island La Palma. Both telescopes offer the great possibility to operate new light detectors alongside the existing camera equipped with 1039 photomultiplier tubes (PMTs). Within the Otto-Hahn working group of the MPG and the MAGIC collaboration we built a composite light detector module which consists of a large-size assembled matrix of silicon photomultipliers (SiPMs) with the same active area as PMT pixels. The aim is to evaluate their potential use as an alternative photo sensor for existing and future experiments as MAGIC and the Cherenkov Telescope Array (CTA). Special constraints on the design as for example operation at high ambient temperatures and high levels of background light have been addressed. We developed an analog summation circuit to combine the individual SiPM signals while preserving the pulse shape of a single sensor. With a dedicated analysis we perform a detailed comparison of our SiPM module to PMTs with data from regular telescope operations. In this presentation we show the design, our comparison to PMTs and the influences of our finding on the next iteration of prototypes.