Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 72: Postersitzung Teilchenphysik
T 72.6: Poster
Dienstag, 28. März 2017, 16:45–19:00, F Foyer
Investigations of the KATRIN interspectrometer Penning trap — •Mariia Fedkevych for the KATRIN collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 9, 48149 Münster, Germany
The KArlsruhe TRItium Neutrino Experiment is a direct low-background measurement of the neutrino mass from the kinematics of tritium-β-decay aiming for a sensitivity of 0.2 eV/c2. To analyze energies of electrons, generated in the WGTS (windowless gaseous tritium source), KATRIN uses a pair of electrostatic spectrometers working in MAC-E-filter mode (called pre- and main-spectrometer). In the region between them, a Penning trap is created by the combination of retarding potentials of -18.3 kV in the pre-spectrometer and -18.6 kV in the main spectrometer together with a magnetic field of 4.5 T produced by a common superconducting magnet. Electrons accumulating in this trap can lead to discharges which create additional background and may present a certain danger for spectrometer and detector section of KATRIN. To counteract this problem, so-called Penning wipers were designed and implemented in the magnet between two spectrometers. A Penning wiper is a metal rod which can be moved in and out of the electron flux tube to remove trapped particles. In this presentation the general idea and the first test measurements are presented. Results of background measurements with different electric and magnetic field settings will be discussed. This work is supported under BMBF contract number 05A14PMA.