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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Poster
HK 49.21: Poster
Thursday, March 15, 2007, 16:00–17:00, P
Simulations of the wire electrode for the KATRIN main spectrometer — •Karen Hugenberg1, Ferenc Glück2, Kathrin Valerius1, Sebastian Vöcking1, and Christian Weinheimer1 for the KATRIN collaboration — 1Institut für Kernphysik, Westfälische Wilhelms-Universität Münster — 2Institut für Experimentelle Kernphysik, Universität Karlsruhe (TH)
The KArlsruhe TRItium Neutrino experiment aims to determine the mass of the electron antineutrino with a sensitivity of 0.2 eV/c2 (90% C.L.) by measuring the endpoint region of the tritium β spectrum.
To analyse the energies of the electrons produced in the decay, the particles are guided adiabatically along magnetic field lines within an electrostatic spectrometer while the field strength decreases by 4 orders of magnitude thus transforming transversal into longitudinal energy. This energy is then analysed by the retarding potential of the spectrometer.
The most important source of background are electrons produced by cosmic muons and intrinsic radioactivity in the spectrometer material. Therefore, the inner surface of the spectrometer will be covered by thin wire layers screening the inner part of the spectrometer from background electrons by applying a negative electric potential relative to the vessel.
The poster presents the basic concept of the wire electrode as well as simulations undertaken to optimise the design.
Funded by BMBF under contract number 05CK5MA/0 and by the Virtual Institute VIDMAN of the HGF.