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T: Fachverband Teilchenphysik
T 6: Neutrino physics without accelerators I
T 6.5: Vortrag
Montag, 30. März 2020, 17:30–17:45, H-HS IV
Column Density Determination in KATRIN with the Photo-Electron Source — •Christoph Köhler1, Fabian Block2, and Alexander Marsteller2 for the KATRIN collaboration — 1Technical University of Munich/Max Planck Institue for Physics — 2Karlsruhe Institute of Technology
The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure the effective electron antineutrino mass with a sensitivity of 200 meV (90 % C.L.) using the direct method of investigating the spetral shape of the tritium beta spectrum near the endpoint. To achieve this goal the column density of the windowless gaseous tritium source (WGTS) has to be known with a precision of 0.2 %.
The experimental setup of KATRIN includes an angular resolved electron gun in the rear-end of the beamline. Electrons produced by this source traverse the full length of the WGTS before they are selected according to their energy in the spectrometer and counted by the detector. Analyzing the measured e-gun data with a model of the KATRIN response function for the e-gun electrons allows the determination of the column density with high precision. The implementation of the model reponse function in the analysis software Fitrium and the successful application of this method in the first neutrino mass science run of KATRIN is presented in this talk.
This work is supported by the Technical University of Munich and the Max Planck Society.