Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Astroparticle Physics I

HK 35.4: Talk

Wednesday, March 16, 2016, 15:15–15:30, S1/01 A02

Monitoring the Energy Scale of KATRIN with Conversion Electrons of a Solid ^83mKr Source as Nuclear Standard — •Klaus Schloesser for the KATRIN collaboration — Karlsruher Institut fuer Technologie /IKP

For KATRIN* to be able to achieve the desired sensitivity of 200meV/c² for the effective electron neutrino mass, it is of crucial importance that the energy scale of the main spectrometer (18.6 keV) is under control within +/- 60 mV at any given time over the planned measurement time of approximately 5 years.

Besides conventional high voltage dividers and high precision volt meters, a nuclear standard will be deployed additionally in a separate spectrometer of MAC-E filter type. The filter electrodes of both spectrometers are connected galvanically.

For permanent and continuous monitoring an easy to use ion implanted source containing the noble gas ^83mKr was developed and qualified for HV monitoring at the ppm level in the 30kV regime. This talk will present the methods applied and the achievements made.

Acknowledgements:

This work has been supported by the German BMBF (05A14VK2), the Czech GACR (contract P203/12/1896). We are grateful to the ISOLDE collaboration for the opportunity to carry out implantations of ⁸³Rb (I80, IS500) which was also supported by ENSAR founding (contract no. 262010).

*KArlsruhe TRItium Neutrino experiment