Münster 2017 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Instrumentation VIII and Accelerators
HK 34.7: Talk
Wednesday, March 29, 2017, 18:30–18:45, F 073
Energy calibration of the KATRIN experiment — •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 200 meV/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 3·10−6.
For this purpose the potential will be measured directly via two custom made precision high voltage dividers, which were developed in cooperation with PTB, the German national metrology center. In order to determine the absolute values and the stability of the scale factors of the voltage dividers, regular calibration measurements with ppm precision are essential.
In addition the HV will be compared to a natural standard given by monoenergetic conversion electrons from the decay of 83mKr. This will be done continuously in parallel with the KATRIN monitor spectrometer and regularly with a gaseous and a condensed Krypton source to guarantee a redundant calibration system.
The talk will give an overview of the energy calibration of the KATRIN experiment and will show a summary of the calibration measurements over the last years.
This project is supported by BMBF under contract number 05A11PM2.