Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 43: Neutrino physics without accelerators II

T 43.2: Talk

Tuesday, March 16, 2021, 16:15–16:30, Tr

Towards a better understanding of KATRIN’s global magnetic field for neutrino mass measurements — •Jan Behrens and Fabian Block for the KATRIN collaboration — Institute for Astroparticle Physics and Institute of Experimental Particle Physics, Karlsruhe Institute of Technology

The KATRIN experiment aims to determine the effective electron anti-neutrino mass with a sensitivity of 0.2 eV (90% C.L.) by investigating the endpoint region of the tritium decay spectrum. The experimental setup of KATRIN consists of a high-luminosity windowless gaseous tritium source, from which the beta electrons are adiabatically guided in a magnetic flux tube to the spectrometer and detector section, which measures the integrated beta decay spectrum.
The global magnetic field in KATRIN’s experimental setup plays a crucial role in the experiment’s response function. To avoid a bias on the neutrino mass measurement, the magnetic field needs to be known with high accuracy. We present in this talk techniques to determine the magnetic fields in the source and spectrometer sections in KATRIN. Additionally, the influence of the magnetic field uncertainty on the neutrino mass determination is discussed in light of KATRIN’s first neutrino mass results and the on-going further data-taking.
This work is supported by the Helmholtz Association (HGF), the Ministry for Education and Research BMBF (05A17PM3, 05A17PX3, 05A17VK2, and 05A17WO3), the Helmholtz Alliance for Astroparticle Physics (HAP), the GRK 1694, and the Helmholtz Young Investigator Group (VH-NG-1055).