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HK: Fachverband Hadronen und Kerne
HK 8: Astroparticle Physics
HK 8.3: Talk
Monday, March 16, 2009, 15:00–15:15, H-ZO 70
Simulations of the entrance and exit regions of the KATRIN main spectrometer — Ferenc Glück2, •Karen Hugenberg1, Kathrin Valerius1, Christian Weinheimer1, and Michael Zacher1 — 1IKP, WWU Münster — 2IEKP, Universität Karlsruhe
The KArlsruhe TRItium Neutrino experiment aims to determine the electron neutrino mass mνe with a sensitivity of 0.2 eV (90 % C.L.) by measuring the shape of the endpoint of the tritium β-spectrum. For this measurement a high resolution spectrometer on the basis of magnetic adiabatic collimation in combination with an electrostatic filter is under construction. It has a diameter of 10 m and a length of 24 m. To reduce background arising in the surface material due to cosmic muons and intrinsic radioactivity, a wire electrode with sub-mm wire diameters will be installed to screen the sensitive spectrometer volume from background electrons. The impact of this wire electrode on the performance of the spectrometer has been studied using a dedicated computer code based on the boundary element method.
This contribution focuses on design simulations for the critical entrance and exit regions of the spectrometer. Different background effects such as particle storage in Penning traps and high electric field strength are discussed. Their avoidance while preserving the intrinsic properties of the spectrometer is essential to reach the desired sensitivity of the experiment. The design has been finalized and the construction of the electrode system is in progress.
This work is financed by the BMBF under code 05A08PM1.