Stuttgart 2012 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 2: Precision Mass Spectrometry and Fundamental Applications I

MS 2.6: Vortrag

Montag, 12. März 2012, 15:30–15:45, V57.06

Investigation of work functions for precision experiments to investigate the standard electroweak model — •Marcus Beck, Christian Schmidt, Werner Heil, and Alexander Wunderle — Institut für Physik, Johannes Gutenberg-Universität Mainz

The standard model of the electroweak interaction is tested with ever increasing precision by non-accelerator experiments, e.g. using beta decay. The precision of these experiments has reached a point where the variation of the work function of the materials used, e.g. for electrodes, starts to limit the sensitivity. We investigate these variations of the work function using a scanning Kelvin probe. In this talk we will discuss the issue of the variation of the work function in the context of the KATRIN experiment, which will measure the absolute mass of the electron-antineutrino. The question of the variation of the work function is especially important for the rear wall and the main retardation electrode of KATRIN. Together these two define the retardation potential, which has to be known with an absolute precision of 50 mV. First measurements of surfaces covered with a thin gold layer will be presented.