München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Astroparticle Physics II

HK 29.4: Vortrag

Dienstag, 19. März 2019, 17:30–17:45, HS 18

Characterization and Optimization of the Front-End Electronics for LEGEND — •Oskar Moras1, Paul Barton2, Konstantin Gusev1, 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.

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