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T: Fachverband Teilchenphysik

T 22: Poster

T 22.8: Poster

Montag, 25. März 2019, 16:00–18:30, C.A.R.L. Foyer 1. OG

Precision High Voltage at the KATRIN Experiment — •Caroline Rodenbeck¹, Oliver Rest¹, and Thomas Thümmler² — ¹Institut für Kernphysik, WWU Münster — ²Institut für Kernphysik, Karlsruher Institut für Technologie

The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to determine the neutrino mass by measuring the tritium beta spectrum using an integrating spectrometer (MAC-E filter). The sensitivity goal of 0.2 eV/c² (90% C.L.) requires the spectometer’s energy scale to be stable up to 60 meV. This translates to a stability requirement of 3 ppm for the high voltage system that creates the retarding potential (18.6 kV) inside the spectrometer.

KATRIN’s high voltage system meets these requirements with precision power supplies and a high precision monitoring using two custom-built high voltage dividers. The monitoring system is complemented by an independent comparision of the energy scale to a nuclear standard. This is achieved by spectroscopic measurements of mono-energetic conversion electrons from Kr-83m decays utilizing different source formats (implanted, condensed, gaseous).

The poster will give a detailled overview of KATRIN’s high voltage system and its performance during recent commissioning measurements. This project is supportet by BMBF under contract number 05A17PM3.