Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 56: Neutrinophysik 4 (Doppelbetazerfall und Massen)
T 56.7: Vortrag
Dienstag, 28. März 2017, 18:20–18:35, VSH 118
Ion-induced background processes in the KATRIN main spectrometer — •Woo-Jeong Baek for the KATRIN collaboration — Karlsruhe Institute of Technology (KIT), Institut für Experimentelle Kernphysik (IEKP)
The aim of the KArlsruhe TRItium Neutrino (KATRIN) Experiment is to determine the effective mass of the electron antineutrino with a sensitivity of 200 meV/c2 in a model-independent way by investigating the energy spectrum of tritium β-electrons near the endpoint.
The experimental setup of KATRIN consists of a windowless gaseous tritium source (WGTS), a transport section for the signal electrons split in differential and cryogenic pumping sections for the extraction of gaseous tritium, a high-resolution electrostatic spectrometer system (pre- and main spectrometer) based on the MAC-E filter principle and
a focal-plane detector system, that detects the transmitted electrons. The flux of positive ions, which originate in the decay of tritium, is reduced by several subsystems (e.g. blocking electrodes) in the pumping sections. In order to investigate the possibility to use the KATRIN spectrometers as sensitive ion detectors, a series of dedicated measurements were performed as part of the first commissioning measurement phase of the KATRIN beam line in November 2016.
This talk will present the results of these measurements focusing on the characteristics of ion-induced background processes in the main spectrometer. This work is supported by KSETA, BMBF (05A14VK2), HAP and the Helmholtz association.