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T: Fachverband Teilchenphysik
T 69: Neutrinomasse III
T 69.7: Vortrag
Mittwoch, 2. März 2016, 18:20–18:35, VMP5 SR 0079
Work function studies of gold surfaces with a Kelvin Probe for the Rear Section of the KATRIN experiment — •Kerstin Schönung for the KATRIN collaboration — Karlsruhe Institute of Technology
The KArlsruhe TRItium Neutrino-Experiment KATRIN will perform a model-independent measurement of the antineutrino mass by the examination of the beta electron energy spectrum of a gaseous molecular tritium source. To achieve the desired sensitivity of 0.2 eV/c2 (90 % CL) the plasma potential of the tritium gas must be temporally and spatially stable within 20 meV. Therefore, the work function of the so called Rear Wall which probably defines the plasma potential must be known even more precisely and the temporal changes must be investigated.
A common instrument to measure the work function of a surface with a precision of a few meV is a Kelvin Probe. Such a system was built up at the Tritium Laboratory Karlsruhe. In the talk the working principle of a Kelvin Probe and the setup will be presented. In addition first work function measurements of Rear Wall candidates will be discussed.