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T: Fachverband Teilchenphysik

T 53: Neutrino physics 6

T 53.3: Vortrag

Mittwoch, 6. März 2024, 16:30–16:45, Geb. 20.30: 2.058

Backscattering reduction with a micro-structured rear wall at KATRIN — •Tom Geigle — Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

The TRISTAN detector upgrade represents the subsequent phase of the KATRIN experiment, designed with the objective of searching a sterile neutrino at the keV scale through its impact on the tritium beta spectrum. A crucial aspect of this project is the detection of beta electrons down to a few keV, which previously did not have to be included in the KATRIN endpoint measurement.

Of particular significance are beta electrons that undergo scattering on the rear wall of the experimental setup before reaching the detector. This phenomenon introduces a distortion in the shape of the measured spectrum within the region of interest, necessitating mitigation strategies to attain the anticipated sensitivity levels.

To address this challenge, diverse configurations of micro-structured rear walls are being examined through Geant4 simulations. These simulations aim to identify an optimal solution that effectively minimizes the impact of scattered beta electrons on the measured spectrum, thereby facilitating the realization of the planned sensitivity goals.

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; Microstructure; TRISTAN; keV-sterile; Geant4