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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Instrumentation III

HK 20.5: Vortrag

Dienstag, 31. März 2020, 18:00–18:15, J-HS C

Analysis plane optimization for background reduction in the KATRIN experiment — •Benedikt Bieringer for the KATRIN collaboration — Institut für Kernphysik, Uni Münster, Germany

The Karlsruhe Tritium Neutrino experiment (KATRIN) aims at determining the electron antineutrino mass with a sensitivity of 0.2 eV (90% CL). Two spectrometers, electrostatic filters of MAC-E filter type, are used to measure the integral energy spectrum of Tritium β decay electrons from a windowless gaseous tritium source. To reach the specified sensitivity, it is crucial to reduce experimental backgrounds as far as possible. Two main sources of background in the main spectrometer are assumed to be highly excited Rydberg atoms ionized by thermal radiation, and secondary electrons produced by trapped Radon-219 decay electrons. By optimization of the electric and magnetic fields inside the main spectrometer, the volume dependent Rydberg background can be drastically lowered. In this talk, the effort of field optimization with real time field calculations is presented. This work is supported under BMBF contract number 05A17PM3.