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T: Fachverband Teilchenphysik

T 69: Neutrinomasse III

T 69.8: Vortrag

Mittwoch, 2. März 2016, 18:35–18:50, VMP5 SR 0079

Ions in the KATRIN experiment — •Ferenc Glück for the KATRIN collaboration — Karlsruhe, KIT, Campus Nord

The aim of the KATRIN experiment is to determine the absolute neutrino mass scale in a model independent way, by measuring the electron energy spectrum shape near the endpoint of tritium beta decay. Beta decays and ionizations produce about 2· 10¹² s ⁻¹ tritium ion rate in the KATRIN source. About 10 % and 1 % of that rate is the expected flux of positive tritium ions and T⁻ ions leaving the source in detector direction. The positive tritium ions are not affected by the pumping system, and, when unhindered, they would cause an extremely large background and tritium contamination in the spectrometers. They will be blocked in the transport system by positive potential electrodes and will be removed from the flux tube by dipole electrodes. The ion composition and the ion blocking and removal efficiency will be tested by an FT-ICR trap, a Faraday cup and the KATRIN pre- and main spectrometers and FPD, using both a photoelectron induced deuterium plasma and the tritium beta decay plasma.

This work has been supported by the German BMBF (05A14VK2).