München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Astroparticle Physics II

HK 29.4: Talk

Tuesday, March 19, 2019, 17:30–17:45, HS 18

Characterization and Optimization of the Front-End Electronics for LEGEND — •Oskar Moras¹, Paul Barton², Konstantin Gusev^{1, 3}, Patrick Krause¹, Antonio Lucchini⁴, Alan Poon², Stefano Riboldi⁴, Stefan Schönert¹, and Michael Willers² for the LEGEND collaboration — ¹Physik Department, Technische Universität München, Germany — ²INPA and NSD, Lawrence Berkeley National Laboratory, Berkeley, California — ³Joint Institute for Nuclear Research, Dubna, Russia — ⁴Dipartimento di Fisica, Università degli Studi di Milano and INFN Milano, Italy

The LEGEND collaboration aims to use High-Purity Germanium (HPGe) detectors to search for neutrinoless double beta decay of ⁷⁶Ge. In order to achieve the projected sensitivity, an excellent spectroscopic performance is crucial, which is obtained by minimizing the electronic noise. Therefore, it is necessary to operate the first stage of the charge amplifier, a JFET and a feedback circuit, close to the detectors, which requires these components to be extremely radiopure. We report results from first integration tests carried out at TUM. This talk will cover optimization for noise and resolution performance in the test bench, as well as first results from measurements performed in a liquid argon cryostat with a HPGe detector. So far, a test pulser resolution of 0.5 keV @ 1 MeV (FWHM) was achieved. This work has been supported in part by the German Federal Ministry for Education and Research (BMBF) Verbundsforschung and the German Research Foundation (DFG) via the SFB1258.