Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 56: Neutrino-Detektoren II

T 56.6: Talk

Wednesday, March 27, 2019, 17:15–17:30, S07

Calibration of the KATRIN high-voltage monitoring system with ^83mKr conversion electrons — •Oliver Rest for the KATRIN collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster

The KATRIN experiment will measure the endpoint region of the tritium-β-decay spectrum to determine the neutrino mass with a sensitivity of 0.2 eV/c². To achieve this sub-eV sensitivity the energy of the decay electrons will be analyzed using a MAC-E-filter type spectrometer. The retarding potential of the MAC-E-filter of -18.6 kV has to be monitored with a relative precision of 3 ppm over a measurement period of two month. For this purpose the potential will be measured directly via two custom made ppm-precise high-voltage (HV) dividers. In order to determine the absolute values and the stability of their scale factors, regular calibration measurements with ppm precision are required.
Among other things, the HV will be compared to a natural standard given by mono-energetic conversion electrons from the decay of ^83mKr. This has been done in 2017 with gaseous krypton, which can be injected into the KATRIN source section. With conversion electrons emitted by gaseous ^83mKr not only relative changes but also an absolute calibration of the HV system can be performed, since their kinetic energy is well known. The talk will give an overview of the HV calibration at KATRIN with a gaseous ^83mKr source.
This project is supported by BMBF under contract number 05A14PMA and 05A17PM3.