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T: Fachverband Teilchenphysik
T 21: Neutrino Physics without Accelerators 2
T 21.2: Talk
Monday, March 21, 2022, 16:35–16:50, T-H34
Shifted Analyzing Plane: Optimizing spectrometer potentials and fields to reduce background in KATRIN — •Benedikt Bieringer for the KATRIN collaboration — Institut für Kernphysik, Uni Münster, Germany
The KArlsruhe TRItium Neutrino (KATRIN) experiment aims at measuring the electron antineutrino mass to an estimated sensitivity of 0.2 eV/c2 at 90 % CL through spectroscopy of Tritium beta decay electrons using an electrostatic spectrometer of MAC-E filter type. For this level of precision, a low spectrometer background is required. The novel Shifted Analyzing Plane method achieves a significant reduction of this background through optimization of MAC-E filter electric potentials and magnetic fields. In this talk, computational and physical methods are presented that enabled the reduction of background of the KATRIN experiment by over a factor of two and fully eliminated measurable correlated background events from trapped high-energetic electrons. This includes a brief introduction to the inner workings of a MAC-E filter, a novel software collection to enable realtime field calculations based on Zonal Harmonic Field Expansion and background modelling for the largest ultra-high vacuum component in the KATRIN experiment.
This talk presents work funded via BMBF contract numbers 05A20VK3, 05A20PX3, 05A20PMA and 05A17WO3.