Göttingen 2025 – scientific programme

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T: Fachverband Teilchenphysik

T 16: Neutrino Physics I

T 16.6: Talk

Monday, March 31, 2025, 18:00–18:15, VG 3.103

Adiabatic characteristics of the KATRIN beamline in the TRISTAN phase — •Justus Beisenkötter for the KATRIN collaboration — Intitut für Kernphysik, Universität Münster

After the end of the neutrino mass search with KATRIN, the current focal plane detector will be replaced by the new TRISTAN detector with significantly better energy resolution and higher granularity, to enable a search deep into the tritium beta-decay spectrum for keV sterile neutrinos. In this new measurement phase, the retarding potential of the KATRIN main spectrometer will be reduced from the current level near the spectral end point to a few kV. This will lead to much higher surplus energies in the spectrometer, so that the magnetic moment µ=E_⊥/B of the beta electrons is no longer constant and the adiabatic approximation for electron tranport is no longer valid. Simulations have shown that by changing the field configuration, moving the highest magnetic field from the detector side of the main spectrometer to the source side, the non-adiabatic effects can be suppressed. The talk will present the results of measurements of this new magnetic field setup and a comparison with simulation results. This work is supported by BMBF ErUM-Pro 05A23PMA.

Keywords: Neutrino; Adiabasis; TRISTAN; KATRIN