Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 55: Neutrinophysik VII
T 55.10: Vortrag
Mittwoch, 21. März 2018, 18:45–19:00, Z6 - HS 0.001
Characterization of the KATRIN Pre-Spectrometer for operational mode — •Johannes Heizmann for the KATRIN collaboration — Karlsruhe Institute of Technology (KIT), ETP, Postfach 3640, 76021 Karlsruhe
The Karlsruhe Tritium Neutrino (KATRIN) experiment has the ambitious goal to determine the
effective neutrino mass with a sensitivity of mν= 0.2 eV/c2 at 90% C.L. using electrons originating from tritium β-decay. These electrons are guided magnetically from the source section along the beam line of the transport and pumping section to the spectrometer and detector section (SDS). The SDS, consisting of the pre- and main spectrometer, and a silicon detector, is responsible for filtering and analyzing the energy of the β-electrons utilizing the MAC-E filter principle. Positive ions created by the large flux of β-electrons along the KATRIN beamline can enter the main spectrometer where they produce background via the ionization of residual gas molecules. In order to minimize this background, the pre-spectrometer will electrostatically filter electrons with energies lower than 18.3 keV and remove positive ions from the flux tube. At the same time it will guide β-electrons adiabatically to the main spectrometer. Moreover, the pre-spectrometer can be configured to detect tritium decays.
This talk will present results of recent pre-spectrometer background measurements in preparation of the upcoming tritium operation of KATRIN. Furthermore results of simulations to define the optimum electro-magnetic configuration of the pre-spectrometer for regular operation will be presented.