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T: Fachverband Teilchenphysik

T 45: Neutrino Physics III

T 45.5: Vortrag

Mittwoch, 18. März 2026, 17:15–17:30, AudiMax

Electron Backscattering at the Focal Plane Detector of KATRIN — •Philipp Lingnau for the KATRIN collaboration — Tritium Laboratory Karlsruhe (TLK), Institute for Astroparticle Physics (IAP), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany

The KATRIN experiment has put the most stringent model-independent upper limit on the electron antineutrino mass. The goal is to limit it to < 0.3 eV. To achieve this, a large amount of tritium beta-electrions need to be spectroscopied using a MAC-E-filter type spectrometer.

One systematic effect on the neutrino mass measurement is the detector backscattering. In the past we performed an in-situ measurement using time-of-flight spectroscopy. With it, the structure in electron energy loss due to plasmon excitations inside the detector can be resolved.

I will present the analysis of the measurement, featuring various improvements, including a rigorous investigation of the impact of fluctuations of the electrical potentials, improved electric and magnetic field simulations using Kassiopeia, as well as more in-depth ToF simulations.

In the future, this measurement principle and the analysis framework can be adapted for the TRISTAN phase of KATRIN, where understanding the escape spectrum from backscattered electrons is of greater importance than for KATRIN.

Keywords: KATRIN; ToF spectroscopy; electron backscattering; MAC-E-filter