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HK: Fachverband Physik der Hadronen und Kerne
HK 35: Astroparticle Physics I
HK 35.5: Vortrag
Mittwoch, 16. März 2016, 15:30–15:45, S1/01 A02
Investigation of background processes in the KATRIN main spectrometer — •Axel Müller for the KATRIN collaboration — Karlsruhe Institute of Technology (KIT), Institut für Kernphysik (IKP)
The KArlsruhe TRItium Neutrino experiment aims to probe the mass of the electron antineutrino in a model-independent way with an unsurpassed sensitivity of mν = 200 meV/c2 (90% C.L.). In order to determine the neutrino mass, the energy spectrum of electrons from the tritium β-decay is analyzed by a high-resolution electrostatic spectrometer which is based on the MAC-E filter principle.
To keep the influence of the spectrometer background on the neutrino mass sensitivity small, KATRIN aims for a background level of 0.01 cps. For the investigation of different background components such as cosmic muons, external gamma radiation and the radioactive decay of isotopes in the volume of the spectrometer or on its surface, a series of dedicated measurements were performed with a combined system of main spectrometer and detector.
This talk will present the results of measurements focusing on the secondary electron production at the inner surface of the spectrometer and compare them with electro-magnetic elctron tracking simulations performed with the KATRIN developed simulation software KASSIOPEIA.
This work has been supported by the German BMBF (05A14VK2).