Calibration of high voltages at the ppm level by the difference of Kr-83m conversion electron lines at the KATRIN experiment

0490014 - ÚJF 2019 RIV US eng J - Článek v odborném periodiku
Arenz, M. - Baek, W. -J. - Beck, M. - Beglarian, A. - Behrens, J. - Dragoun, Otokar - Kovalík, Alojz - Lebeda, Ondřej - Ryšavý, Miloš - Sentkerestiová, Jana - Suchopár, Martin - Vénos, Drahoslav … celkem 127 autorů
Calibration of high voltages at the ppm level by the difference of Kr-83m conversion electron lines at the KATRIN experiment.
European Physical Journal C. Roč. 78, č. 5 (2018), č. článku 368. ISSN 1434-6044. E-ISSN 1434-6052
Grant CEP: GA MŠMT LM2015056; GA MŠMT LTT18021
Institucionální podpora: RVO:61389005
Klíčová slova: KATRIN * neutrino * Kr-83m
Obor OECD: Particles and field physics
Impakt faktor: 4.843, rok: 2018

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 4 years ago. This result demonstrates the utility of the calibration method, as well as the long-term stability of the voltage divider.
Trvalý link: http://hdl.handle.net/11104/0284307