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T: Fachverband Teilchenphysik
T 92: Neutrinomasse IV
T 92.8: Vortrag
Donnerstag, 3. März 2016, 18:35–18:50, VMP5 SR 0079
Simulation of Background by Rydberg states in the KATRIN Mainspectrometer — •Nikolaus Trost for the KATRIN collaboration — Karlsruhe Institute of Technology (KIT), Institut für Kernphysik (IKP)
The KArlsruhe TRItium Neutrino (KATRIN) experiment is a large-scale experiment for the model independent determination of the mass of electron anti-neutrinos with a sensitivity of 200 meV/c2. It inves- tigates the kinematics of electrons from tritium β-decay close to the endpoint of the energy spectrum with a highresolution electrostatic spectrometer (ΔE = 0.93 at 18.6 keV). Due to the low signal rate near the endpoint a low background level is of very high importance. Rydbgerg atoms excited and desorbed from the spectrometer surface can penetrate in the sensitive fluxtube uninfluenced by fields and be ionised by thermal radiation. The talk will present detailed simulation and analysis of this particular background process. This work has been suported by the German BMBF (05A14VK2).