Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 69: Neutrinomasse III

T 69.5: Vortrag

Mittwoch, 2. März 2016, 17:50–18:05, VMP5 SR 0079

Stability measurements of the electron gun for the KATRIN Rear Section — •Sylvia Ebenhöch for the KATRIN collaboration — Karlsruhe Institute of Technology (KIT), Institute for Technical Physics (ITEP), Tritium Laboratory Karlsruhe (TLK)

The aim of the KArlsruhe TRItium Neutrino (KATRIN) experiment is to determine the antineutrino mass with a sensitivity of 0.2 eV (90 % C.L.) by high-precision spectroscopy close to the tritium beta decay endpoint at 18.6 keV. To achieve the sensitivity aim both statistical and systematic uncertainties must be minimized. One contribution to the systematic error are uncertainties in the column density of the tritium source or in the source activity. In order to detect and monitor changes in the tritium source the Rear Section, which is integrated at the rear end of the KATRIN setup, is used. The Rear Section includes an angular selective electron gun (e-gun) based on the photoelectric effect. With the e-gun it will be possible e.g. to achieve a precise calibration of the column source density. To achieve the requirements on the e-gun a stable UV light source is essential to produce photoelectrons. The presentation will focus on the setup of the e-gun and intensity stability measurements of the UV light source setup.