Measurement of the electric potential and the magnetic field in the shifted analysing plane of the KATRIN experiment

Abstract

The projected sensitivity of the effective electron neutrino-mass measurement with the KATRIN experiment is below 0.3 eV (90 % CL) after five years of data acquisition. The sensitivity is affected by the increased rate of the background electrons from KATRIN's main spectrometer. A special shifted-analysing-plane (SAP) configuration was developed to reduce this background by a factor of two. The complex layout of electromagnetic fields in the SAP configuration requires a robust method of estimating these fields. We present in this paper a dedicated calibration measurement of the fields using conversion electrons of gaseous ${}^{83m}$Kr, which enables the neutrino-mass measurements in the SAP configuration.

arXiv comment19 pages, 11 figures

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Cited by in corpus (2)

• Direct neutrino-mass measurement based on 259 days of KATRIN data
• A precision 32 keV angular-selective photoelectron source for calibration measurements at the KATRIN experiment