Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 31: Neutrinophysik VI

T 31.1: Vortrag

Dienstag, 20. März 2018, 16:30–16:45, Z6 - HS 0.001

Ion monitoring in the KATRIN experiment — •Manuel Klein for the KATRIN collaboration — Karlsruhe Institute of Technology (KIT), ETP, Postfach 3640, 76021 Karlsruhe

The KArlsruhe TRItium Neutrino (KATRIN) experiment aims at the model-independent measurement of the electron neutrino mass. It is designed for a neutrino mass sensitivity of 0.2 eV (90% CL) after three full years of measurement time. KATRIN measures the end point of the tritium beta-decay spectrum using a MAC-E filter and a Windowless Gaseous Tritium Source (WGTS). While neutral tritium gas molecules are pumped out from the beamline, decay electrons are guided to the detector by strong magnetic fields. Tritium ions, however, would also follow the magnetic field lines to the Pre- and Main Spectrometer, where they could cause background by ionisation and contamination. Preventing this is imperative for KATRIN measurements.

Ring electrodes in the transport section will block the tritium ions via positive electric potentials. These potentials could possibly be neutralised by negative space charges. Several ion detection methods therefore will monitor the residual ion flux, with specific advantages in terms of sensitivity, continuous availability and systematics. The most sensitive method is observation of the background from tritium ions by ionisation of residual gas in the spectrometers. Other ion detection methods are based on Fourier Transform Ion Cyclotron Resonance (FT-ICR) and Faraday Cup measurements of neutralisation currents.

Supported by research training group GRK 1694, the YIG VH-NG-1055, BMBF (Ø05A17VK2) and the Helmholtz Association.