High-voltage monitoring with a solenoid retarding spectrometer at the KATRIN experiment

The KATRIN experiment will measure the absolute mass scale of neutrinos with a sensitivity of mν = 200 meV/c2 by means of an electrostatic spectrometer set close to the tritium β decay endpoint at 18.6 keV. Fluctuations of the energy scale must be under control within±60 mV (±3 ppm). Since a precise voltage measurement in the range of tens of kV is on the edge of current 1Corrisponding author. 2Present address: Physikalisch Technische Bundesanstalt, D-48149 Münster, Germany 3Deceased. c © CERN 2014, published under the terms of the Creative Commons Attribution 3.0 License by IOP Publishing Ltd and Sissa Medialab srl. Any further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation and DOI. doi:10.1088/1748-0221/9/06/P06022