SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 68: Neutrinos, Dark Matter VIII

T 68.1: Vortrag

Mittwoch, 22. März 2023, 15:50–16:05, POT/0006

Determination of electromagnetic fields in the shifted analyzing plane of the KATRIN main spectrometer — •Fabian Block and Alexey Lokhov for the KATRIN collaboration — Karlsruhe Institute of Technology

The KATRIN experiment aims to determine the effective electron antineutrino mass with a sensitivity of 0.2 eV (90 % C.L.) by high-resolution spectroscopy of the endpoint region of the tritium β decay spectrum. To reach the sensitivity goal, the experimental setup of KATRIN combines a windowless gaseous tritium source with a high-resolution MAC-E filter, called main spectrometer. The energy analysis of the β-decay electrons in the main spectrometer takes place via a complex interplay of electric and magnetic fields.
To improve the signal-to-background ratio in neutrino mass measurements, the electromagnetic field configuration in the main spectrometer is adapted to the so-called Shifted Analyzing Plane (SAP). The SAP fields need to be known with high precision in order for them to be taken accurately into account in the β-spectrum model applied in the fit of the data. We present in this talk the results of high-statistics SAP characterization measurements employing conversion electrons of Kr-83m as sensitive probes for electromagnetic fields.
This work is supported by the Helmholtz Association, the Ministry for Education and Research BMBF (05A17PM3, 05A17PX3, 05A17VK2, and 05A17WO3), the Helmholtz Alliance for Astroparticle Physics (HAP), and the Helmholtz Initiative and Networking Fund (W2/W3-118).