Wuppertal 2015 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 94: Niederenergie Neutrinophysik VI

T 94.6: Vortrag

Donnerstag, 12. März 2015, 18:00–18:15, I.13.71 (HS 28)

Simulation of realistic electromagnetic fields for the KATRIN Main Spectrometer — •Daniel Hilk for the KATRIN collaboration — Institut für Experimentelle Kernphysik, KIT, Karlsruhe

The goal of the 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 with a sensitivity of 200 meV (90 % C.L.). KATRIN consists of a molecular tritium source, a transport section and a spectrometer section for a precise energy measurement. The main spectrometer is based on the MAC-E (magnetic adiabatic collimation with electrostatic filtering) principle: Electrons are guided adiabatically on magnetic field lines, and a precise electric retarding potential within the main spectrometer filters the electrons by their energy.

The simulation of the electro-magnetic fields is crucial to optimize the transmission properties and to study various background processes. These fields have been simulated with the software KEMField, which has been developed within the KATRIN collaboration. The tool can compute precise three-dimensional electro-magnetic fields for complex geometries. In context of this talk, field simulations for the KATRIN main spectrometer are presented in comparison to latest measurement results from the second commissioning phase. Furthermore, technical improvements of the KEMField software are discussed. This work was supported by the BMBF under grant no. 05A11VK3 and by the Helmholtz Association.