SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 91: Neutrinos IV

T 91.3: Vortrag

Mittwoch, 22. März 2023, 18:00–18:15, POT/0006

The other end of KATRIN – systematic effects by the rear wall — •Leonard Hasselmann, Max Aker, and Rudolf Sack — IAP, Karlsruher Institut für Technologie

In order to determine the neutrino mass with a sensitivity of 0.2 eV/c² (90% C.L.) the Karlsruhe Tritium Neutrino (KATRIN) experiment measures the β-decay endpoint spectrum of tritium using a MAC-E filter type spectrometer. In KATRIN’s source 10¹¹ β-decay electronss are emitted per second. They are magnetically guided to the spectrometer in one direction and to a gold coated stainless steel plate, named rear wall, to the other.

A comprehensive understanding of various background contributions, e.g. accumulated tritium on the rear wall, is paramount. Decays of absorbed tritium create an additional spectrum which superimposes that of the source. This results in a systematic uncertainty, which is mitigated either by modelling the additional spectrum or by removing the tritium from the rear wall and surrounding surfaces.

The talk presents an overview on a cleaning method using UV/ozone which has been performed three times so far in the KATRIN setup. Besides a good cleaning performance, an influence on the source potential was found. Additionally, results from a test setup further investigating the cleaning effect are discussed.

This work is supported by the Helmholtz Association (HGF), the Ministry for Education and Research BMBF (05A17PM3, 05A17PX3, 05A17VK2, and 05A17WO3).