Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Astroparticle Physics 4

HK 61.6: Talk

Thursday, March 26, 2015, 18:45–19:00, M/HS4

Efficient Field Calculations for the KATRIN experiment by Fast Fourier Transformation on Multipoles — •Wolfgang Gosda for the KATRIN collaboration — Institut für Experimentelle Kernphysik, KIT, Karlsruhe

The aim of the KArlsruhe TRItium Neutrino experiment (KATRIN) is to measure the electron anti neutrino mass with a sensitivity of 200 meV by measuring the energy spectrum of electrons from the tritium beta decay at the end point. Designed for high energy resolution, the main spectrometer has been built as a huge and complex vacuum vessel, 23 m long and 10 m in diameter. It features more than 46.000 wires along the inner walls to provide electric shielding against cosmic ray events. For studying transmission and electro-magnetic properties of the KATRIN main spectrometer, detailed field computations have to be performed. For fast and realistic three-dimensional computations, special methods like the Fast Fourier Transformation on Multipoles (FFTM) are indispensable. Together with the open source software Kassiopeia developed by the KATRIN Collaboration, FFTM can be used for both the calculation of the surface charge densities via boundary element methods and the fast evaluation of the ensuing fields. This talk introduces fast multiplication methods, explains the basic concepts of FFTM and presents the results of performance tests on the Kassiopeia implementation. This work was supported by the BMBF under grant no. 05A11VK3 and by the Helmholtz Association.