Dresden 2017 – wissenschaftliches Programm

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 4: Poster Session

VA 4.3: Poster

Montag, 20. März 2017, 14:45–16:00, P2-OG3

Gas dynamics simulations of the tritium source for the KATRIN experiment — •Florian Heizmann¹, Laura Kuckert², and KATRIN Collaboration^1,2 — ¹KIT, Institute of Experimental Nuclear Physics (IEKP), P.O. box 3640, D-76021 Karlsruhe — ²KIT, Institute for Nuclear Physics (IKP), P.O. box 3640, D-76021 Karlsruhe

The Karlsruhe Tritium Neutrino Experiment (KATRIN) aims to measure the neutrino mass with a sensitivity of 200 meV/c² (90% C.L.) in a direct approach using the beta decay of molecular tritium. The neutrino mass is extracted by fitting model-based beta decay spectra to the measured electron spectrum. Thereby it is important to include modifications from systematic effects to the spectrum model. Especially the gas dynamics in the windowless gaseous tritium source (WGTS) play a key role for accurate modelling. Since in most cases this can not be measured directly, the modelled beta spectrum relies on gas dynamics calculations as well as on monitoring of operation parameter changes. A comprehensive pseudo-3D model has been developed. The accuracy of the gas dynamics model in the spectrum simulation including the monitoring of operation parameters is reviewed and implications on the systematics budget for the neutrino mass measurement are described. Supported by KSETA, BMBF (05A14VK2), HAP and the Helmholtz Association.