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T: Fachverband Teilchenphysik
T 31: Neutrinophysik VI
T 31.2: Vortrag
Dienstag, 20. März 2018, 16:45–17:00, Z6 - HS 0.001
Investigation of ion-induced background processes in the KATRIN spectrometers — •Woo-Jeong Baek for the KATRIN collaboration — Hermann-von-Helmholtz-Platz 1 Building 402, Room 206 76344 Eggenstein-Leopoldshafen, Germany
The KArlsruhe TRItium Neutrino (KATRIN) experiment targets the determination of the effective electron (anti-)neutrino mass with a sensitivity of 0.2 eV/c2 by means of a precise measurement of the tritium β electron energy spectrum close to the endpoint. The experimental setup of KATRIN consists of a windowless gaseous tritium source (WGTS), the cryogenic and differential pumping sections ensuring the transport of the signal electrons, the MAC-E filter based electrostatic pre- and main spectrometer followed by the focal plane detector which enables the measurement of the transmitted electrons. The required sensitivity on the neutrino mass limits the allowed nominal
background rate to 10 mcps. In order to achieve this goal, a detailed understanding of background processes such as the generation of low energy electrons due to positive ions is essential. In addition to the simulation
of the ion transport along the KATRIN beamline, scattering processes of different ion species on residual gas molecules were investigated via simulations in the spectrometer section to gain a deeper knowledge on this background causing mechanism. The results will be
presented focusing on the characteristics of ion-induced background processes.
This work has been supported by BMBF (05A17VK2).