Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Poster (a)

HK 51.35: Poster

Donnerstag, 2. April 2020, 16:30–18:30, Zelt

Precision Stabilization of KATRIN’s Retarding Potential — •Caroline Rodenbeck1, Julius Hartmann3, Thomas Thümmler2, and Sascha Wüstling3 for the KATRIN collaboration — 1Institut für Kernphysik, WWU Münster — 2IKP, Karlsruher Institut für Technologie — 3IPE, Karlsruher Institut für Technologie

The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to determine the neutrino mass by measuring the tritium beta spectrum using a MAC-E filter type spectrometer. The spectrometer’s energy defining retarding voltage needs to be stable within 60 mV for KATRIN to reach its sensitivity target of 0.2 eV/c2 (90% C.L.). This translates to a stability requirement of 3 ppm for the high voltage system creating the retarding potential of −18.6 kV inside the spectrometer.

KATRIN’s high voltage system meets these stability requirements on a wide range of time scales ranging from several months down to 1 µs (1 MHz). Dedicated calibration methods ensure a long-term stability of the precision high voltage dividers, measuring the retarding potential. A stabilization on shorter time scales is ensured by a custom-built post regulation system. With a new feedback loop between one of the precision high voltage dividers and the post regulation a sub-ppm stabilization of the retarding potential for longer than 30 hours is achieved.

The poster will give an overview of KATRIN’s high voltage system with a focus on the post regulation and its perfomance during the recent KATRIN neutrino mass runs. This project is supported by BMBF under contract number 05A17PM3.

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