Würzburg 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 55: Neutrinophysik VII
T 55.9: Vortrag
Mittwoch, 21. März 2018, 18:30–18:45, Z6 - HS 0.001
Plasma Investigations for the KATRIN experiment — •Jonas Kellerer for the KATRIN collaboration — Karlsruhe Institut of Technology (KIT), ETP, Postfach 3640, 76021 Karlsruhe
The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to determine the effective neutrino mass with a sensitivity of mν = 0.2 eV/c2 (90% C.L.) in a direct approach using the β-decay of molecular tritium and a MAC-E filter spectrometer. The neutrino mass is extracted from a fit of modelled beta decay spectra to the measured electron spectrum. Hence, a complete investigation of the processes influencing the electron energy is necessary. The potential energy of the emitted electrons is set by the electrostatic potential at the position of β-decay in the windowless gaseous tritium source (WGTS). The potential distribution in the WGTS is determined by a cold low-density plasma that forms inside the strong magnetic field of the WGTS through β-decay and secondary ionizations. A comprehensive fluid plasma model has been developed to investigate the properties of the plasma. The model includes creation, annihilation and motion of electrons and ions in a steady flow of neutral gas and confined by a longitudinal magnetic field. Diverse creation and annihilation rates were studied and implications on the systematics of the neutrino mass measurement were deduced. Supported by BMBF (05A17VK2), KSETA and the Helmholtz Association.