Speaker
Description
The Karlsruhe Tritium Neutrino experiment (KATRIN) aims to determine the neutrino mass by measuring the tritium beta decay spectrum with a sensitivity of 0.2 eV (90 % C.L.). To reach this goal the spectrometer’s energy scale needs to be stable on the 60 meV level. This translates to a 3 ppm stability requirement for the high voltage creating the retarding potential (18.6 kV). The high voltage system outperforms this requirement with a stability of 2 ppm and is therefore a negligible systematic for the neutrino mass analysis.
Another important systematic are energy losses of beta decay electrons inside the windowless gaseous tritium source (WGTS) of KATRIN. Using mono-energetic electrons from a photo-electron source and applying a time-of-flight analysis we performed measurements of energy losses inside the WGTS. These in-situ measurements provide an energy loss shape with unprecedented precision.
The talk will give an overview of both topics with regard to the results from KATRIN’s most recent science run in spring 2019. This project is supported by BMBF under contract number 05A17PM3.