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T: Fachverband Teilchenphysik
T 33: Neutrino physics 4
T 33.3: Vortrag
Dienstag, 5. März 2024, 16:30–16:45, Geb. 30.21: Gerthsen-HS
Background investigations for keV sterile neutrino search at KATRIN — •Moritz Puritscher for the KATRIN collaboration — Karlsruhe Institute of Technology (KIT)
Starting in 2026, the KATRIN experiment aims to measure the kink-like distortion of a keV-scale sterile neutrino in the tritium beta spectrum. In order to search for such a signal with the KATRIN setup several changes to the beamline are necessary. The integration of the modular TRISTAN detector into the KATRIN beamline can lead to deteriorated vacuum conditions at the main spectrometer. Together with changed electromagnetic settings at the main spectrometer, the amount of background electrons that are mapped onto the detector is expected to change. To study the effect of these changes on the overall background level, a set of background measurements at different retarding potentials and pressures was performed. Overall, only a slight increase of background at an elevated pressure of 10−9 mbar can be observed. However, changed trapping conditions for electrons at elevated pressure and low retarding potential can significantly increase the background rate.
This work is supported by the Helmholtz Association and by the Ministry for Education and Research BMBF (grant numbers 05A23PMA, 05A23PX2, 05A23VK2, and 05A23WO6)
Keywords: KATRIN; Background