Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 50: Neutrinomasse II
T 50.6: Vortrag
Dienstag, 1. März 2016, 18:00–18:15, VMP5 SR 0079
Determination of the tritium flux in the pre-spectrometer of the KATRIN experiment — •Momin Ahmad for the KATRIN collaboration — Karlsruhe Institute of Technology (KIT), Institute for Experimental Nuclear Physics (IEKP)
The Karlsruhe Tritium Neutrino experiment aims to probe the mass of the electron antineutrino in a model-independent way with an unsurpassed sensitivity of mν = 200 meV/c2 (90% C.L.). The energy spectrum of electrons from tritium β-decay is analyzed by an electrostatic spectrometer which is based on the MAC-E filter principle.
The beamline of the KATRIN experiment starts with the rear section and the windowless gaseous tritium source. Different pumping systems (e.g. cryogenic pumps) follow until the pre-spectrometer, mainspectrometer and the detector finish the beamline. The tritium flux is reduced by many orders and only few molecules can migrate into
the pre-spectrometer. The decay of tritium in the volume of the prespectrometer generates magnetically trapped electrons with typical energies on the order of a few keV. Via subsequent ionization of residual gas molecules, the primary trapped electrons produce several secondary electrons which can be detected at the detector system at the downstream end of KATRIN. Analysing these electrons using a Monte Carlo simulation allows a better understanding of the tritium activity.
This talk is about the characteristic of the secondary electrons and the relating tritium activity in the pre-spectrometer. This work has been supported by the German BMBF (05A14VK2).