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T: Fachverband Teilchenphysik
T 95: Experimental methods V
T 95.3: Vortrag
Freitag, 3. April 2020, 11:30–11:45, H-HS VI
A test-setup for an electron-tagger for the neutrino mass experiment KATRIN — •Kevin Gauda, Volker Hannen, Patrick Oelpmann, Hans-Werner Ortjohann, Richard Salomon, and Christian Weinheimer for the KATRIN collaboration — Institut für Kernphysik, WWU Münster
KATRIN aims to directly measure the mass of the electron antineutrino. There, a windowless gaseous tritium source and a high-resolution MAC-E filter is used to analyze the endpoint region of the tritium beta-decay. The sensitivity on mν is targeted to reach 0.2 eV/c2 with 90% C.L. after five years. Recently, a first limit was set to 1.1 eV/c2 with 90% C.L. (M. Aker et al. (KATRIN Collaboration), Phys. Rev. Lett. 123 (2019) 221802).
The background in KATRIN is currently higher than originally planned, creating demand for new techniques of background reduction. An electron-tagger between pre- and main-spectrometer of KATRIN, which provides a trigger signal when a beta-decay electron passes, would allow to introduce delayed time-coincidence with the focal-plane detector signal and thereby to discard most background events. Developing such a device, which must not alter the electron energy much, is challenging and close to impossible and various low-temperature quantum detectors need to be tested. Such an electron-tagger could further enhance the sensitivity of KATRIN by applying time-of-flight spectroscopy (N. Steinbrink et al., New J. Phys. 15 (2013) 113020). This talk presents a first setup consisting of an electron-gun, a MAC-E-filter and a detector for testing such quantum devices.