Calibration of high voltages at the ppm level by the difference of $$$$^{83{\mathrm{m}}}$$$$Kr conversion electron lines at the KATRIN experiment
The neutrino mass experiment KATRIN requires a stability of 3 ppm for the retarding potential at -18.6 kV of the main spectrometer. To monitor the stability, two custom-made ultra-precise high-voltage dividers were developed and built in cooperation with the German national metrology institute Physikalisch-Technische Bundesanstalt (PTB). Until now, regular absolute calibration of the voltage dividers required bringing the equipment to the specialised metrology laboratory. Here we present a new method based on measuring the energy difference of two Kr-83m conversion electron lines with the KATRIN setup, which was demonstrated during KATRIN's commissioning measurements in July 2017. The measured scale factor M=1972.449(10) of the high-voltage divider K35 is in agreement with the last PTB calibration four years ago. This result demonstrates the utility of the calibration method, as well as the long-term stability of the voltage divider.
- Research Organization:
- University of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); Helmholtz Association (HGF); German Federal Ministry of Education and Research (BMBF); Ministry of Education, Youth and Sports of the Czech Republic (MEYS)
- Contributing Organization:
- KATRIN collaboration
- Grant/Contract Number:
- AC02-05CH11231; FG02-97ER41020; FG02-94ER40818; SC0004036; FG02-97ER41033; FG02-97ER41041; SC0011091; 05A14VK2; 05A17PM3; VH-NG-1055; CANAM-LM2011019; LTT18021
- OSTI ID:
- 1436553
- Alternate ID(s):
- OSTI ID: 1461990; OSTI ID: 1658840; OSTI ID: 1658952
- Journal Information:
- European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Vol. 78 Journal Issue: 5; ISSN 1434-6044
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- Germany
- Language:
- English
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