Abstract
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 ^{83{mathrm{m}}}Kr 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.
Highlights
Precision high voltages (HV) at the ppm level are required for many applications in science, e.g. for defining the kinetic energy of electrons in an electron cooler at storage rings [1] or for the precise determination of the energy of electrons in electrostatic retarding spectrometers or other analysers [2,3,4].The KArlsruhe TRitium Neutrino (KATRIN) experiment [5] at the Karlsruhe Institute of Technology (KIT) aims for a direct neutrino mass determination by a precise measurement of the tritium-β-decay spectrum near the endpoint
The neutrino mass experiment KATRIN requires a stability of 3 ppm for the retarding potential at − 18.6 kV of the main spectrometer
In order to achieve the design sensitivity of 0.2 eV/c2 in the neutrino mass measurement, the retarding potential of the main spectrometer of the KATRIN experiment has to be monitored with a precision of 3 ppm over measurement intervals of 2 months
Summary
Precision high voltages (HV) at the ppm level are required for many applications in science, e.g. for defining the kinetic energy of electrons in an electron cooler at storage rings [1] or for the precise determination of the energy of electrons in electrostatic retarding spectrometers or other analysers [2,3,4]. The scaled retarding potential can be determined with a commercial precision digital voltmeter (DVM) In this range, the voltage measurement can be calibrated against a 10 V reference, based on the Josephson effect, at the German national metrology institute Physikalisch-Technische Bundesanstalt (PTB). The adiabatic transport of electrons from the source to the detector and the general alignment and functionalities of the complete system were tested [21,22] This measurement campaign provided the opportunity to calibrate the K35 HV divider to the ppm-level by comparing two conversion electron lines. The section gives an overview of the calibration concept and the determination of the scale factor of the divider using 83mKr conversion electron line measurements. The results of the calibration measurements performed at KATRIN are reported
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