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HK: Fachverband Physik der Hadronen und Kerne
HK 7: Astroparticle Physics I
HK 7.3: Vortrag
Montag, 11. März 2024, 17:45–18:00, HBR 19: C 103
Active Transverse Energy Filter Development for KATRIN — •Sonja Schneidewind, Kevin Gauda, Kyrill Blümer, Christian Gönner, Volker Hannen, Hans-Werner Ortjohann, Sebastian Wein, and Christian Weinheimer for the KATRIN collaboration — Institute for Nuclear Physics, University of Münster
The KATRIN experiment aims to measure the neutrino mass via tritium β-decay spectroscopy. Despite implementation of efficient countermeasures, we still observe an elevated experimental background (150 mcps instead of 10 mcps), which needs to be reduced to reach the targeted sensitivity of 0.2 eV/c2. Radioactive decays in the stainless steel vessel of the main spectrometer produce highly-excited Rydberg or autoionizing atomic states in the volume. These release low-energetic electrons, which are energetically indistinguishable from β-electrons at the detector. Their angular distribution, however, is significantly sharper. The "active Transverse Energy Filter" (aTEF) concept was invented to reduce this background by discrimination of electrons in a large magnetic field based on their pitch angle (EPJ-C 82, 922 (2022)). This talk will introduce the "Si-aTEF" as a concept based on Si-PIN diodes. The fabrication process and prototype performance will be presented. The implementation of the Si-aTEF in KATRIN - success supposed - and the expected sensitivity improvement will be shown. This work is supported by the Helmholtz Association, by BMBF (grant numbers 05A23PMA, 05A23PX2, 05A23VK2 and 05A23WO6) and DFG (Research Training Group GRK 2149) in Germany.
Keywords: KATRIN; detector development; Si-PIN diode; background reduction; transverse energy filter