Wideband precision stabilization of the -18.6 kV retarding voltage for the KATRIN spectrometer

C. Rodenbeck; C. Weinheimer; J. Hartmann; O. Rest; S. Enomoto; S. W\"ustling; T. Th\"ummler

Wideband precision stabilization of the -18.6 kV retarding voltage for the KATRIN spectrometer

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arxiv 2203.13153 v2 pith:GOLKFYDM submitted 2022-03-24 physics.ins-det hep-ex

Wideband precision stabilization of the -18.6 kV retarding voltage for the KATRIN spectrometer

C. Rodenbeck , S. W\"ustling , S. Enomoto , J. Hartmann , O. Rest , T. Th\"ummler , C. Weinheimer This is my paper

classification physics.ins-det hep-ex

keywords katrinspectrometeraroundexperimentregulationretardingsensitivitysystem

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The Karlsruhe Tritium Neutrino Experiment (KATRIN) measures the effective electron anti-neutrino mass with an unprecedented design sensitivity of 0.2 eV (90 % C.L.). In this experiment, the energy spectrum of beta electrons near the tritium decay endpoint is analyzed with a highly accurate spectrometer. To reach the KATRIN sensitivity target, the retarding voltage of this spectrometer must be stable to the ppm level and well known on various time scales ($\mu s$ up to months), for values around -18.6 kV. A custom-designed high-voltage regulation system mitigates the impact of interference sources in the absence of a closed electric shield around the large spectrometer vessel. In this article, we describe the regulation system and its integration into the KATRIN setup. Independent monitoring methods demonstrate a stability within 2 ppm, exceeding KATRIN's specifications.

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A precision 32 keV angular-selective photoelectron source for calibration measurements at the KATRIN experiment
physics.ins-det 2026-03 accept novelty 5.0

An upgraded KATRIN photoelectron source reaches 32 keV monoenergetic electrons with adjustable pitch angle, ~100 meV energy spread, and pulsed background reduction by a factor of ~7.