München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Astroparticle Physics I

HK 23.4: Talk

Tuesday, March 19, 2019, 15:15–15:30, HS 18

The Liquid Argon Veto System for the Gerda Phase II Upgrade — •Patrick Krause — Technische Universität München, Garching, Germany

Liquid Argon (LAr) scintillates upon interaction with ionizing radiation. In this process light with a wavelength of 128 nm is emitted. With the help of so-called wavelength shifting (WLS) fibres and silicon photomultipliers (SiPMs), this property is an element of Gerda’s active background suppression strategy to reject events with coincident energy deposition in the germanium detectors and the surrounding LAr. An improved version of the WLS fiber-modules and the SiPM-readout has been developed. This talk will report the changes, challenges and improvements compared to the previous design. Furthermore the first results of the new LAr veto system in Gerda Phase II+ will be presented.

This work has been supported in part by the German Federal Ministry for Education and Research (BMBF) Verbundforschung 05A17W02 and the German Research Foundation (DFG) via the SFB1258.