Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Astroparticle Physics III
HK 49.3: Vortrag
Donnerstag, 17. März 2016, 15:00–15:15, S1/01 A02
Removal of stored particle background via the electric dipole method in the KATRIN main spectrometer — •Daniel Hilk for the KATRIN collaboration — Institut für Experimentelle Kernphysik, KIT, Karlsruhe
The goal of the KArlsruhe TRItium Neutrino (KATRIN) experiment is to determine the effective mass of the electron anti neutrino by measuring the electron energy spectrum of tritium beta decay near the endpoint. The goal is to reach a sensitivity on the neutrino mass of 200 meV for which a low background level of 10−2 counts per second is mandatory. Electrons from single radioactive decays of radon and tritium in the KATRIN main spectrometer with energies in the keV range can be magnetically stored for hours. While cooling down via ionization of residual gas molecules, they produce hundreds of secondary electrons, which can reach the detector and contribute to the background signals. In order to suppress this background component, several methods are investigated to remove stored electrons, such as the application of an electric dipole field and the application of magnetic pulses. This talk introduces the mechanism of background production due to stored electrons and their removal by the electric dipole method in the main spectrometer. In context of the spectrometer- and detector-commissioning phase in summer 2015, measurement results of the application of the electric dipole method are presented. This work was supported by the BMBF under grant no. 05A14VK2 and by the Helmholtz Association.