Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Poster
HK 48.37: Poster
Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer
Influence of the measured work function fluctuation on the aSPECT spectrometer — •Christian Schmidt for the aSPECT collaboration — Institut für Physik, Johannes-Gutenberg Universität Mainz
The aSPECT retardation spectrometer measures the e-νe angular correlation coefficient a in free neutron β decay by utilizing a MAC-E filter. This measurement can be used to determine the ratio gA/gV of the weak coupling constants, as well as to search for physics beyond the Standard Model.
In spring/summer 2013 aSPECT had a successful beamtime at the Institut Laue-Langevin, Grenoble (France). The goal of this beamtime is to improve the current uncertainty of a from Δ a/a ≈ 5 % to about 1%. To achieve this goal the systematics of aSPECT have to be understood accordingly.
One sensitive parameter for the systematic error on a is the knowledge of the retardation voltage, which is defined by our decay volume and analysing plane electrode. Since the potentials are directly influenced by the work function of these electrodes, we utilised a scanning Kelvin probe to measure the work function fluctuations. To investigate the influence on a the measured fluctuations were implemented in a simulation program , the KASPER package, provided by the KATRIN collaboration.
This poster will present the first results of the influence of work function fluctuations on the aSPECT spectrometer using particle tracking.