Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Astroparticle Physics 4

HK 61.3: Vortrag

Donnerstag, 26. März 2015, 18:00–18:15, M/HS4

Setup and commissioning of the precision high voltage system of the KATRIN experiment — •Oliver Rest — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster

The KATRIN (KArlsruhe TRItium Neutrino) experiment will measure the endpoint region of the tritium β decay spectrum to determine the neutrino mass. To achieve sub-eV sensitivity the energy of the decay electrons will be analyzed using a MAC-E type spectrometer. The retarding potential of the MAC-E-filter (up to −35kV) has to be monitored with a precision of 3ppm.
For this purpose the potential will be measured directly via two high precision voltage dividers, which were developed in cooperation with the Physikalisch-Technische Bundesanstalt Braunschweig. In addition the high voltage will be compared to a natural standard given by mono-energetic conversion electrons from the decay of ^83mKr at the MAC-E type monitor spectrometer.
To fine-tune the shape of the electric field individual voltages can be applied to different parts of the wire electrode system inside the main spectrometer.
This talk will give a short overview of the setup of the HV system and show first results of the measurements performed during the main spectrometer commissioning phase.

This project is supported by BMBF under contract number 05A11PM2.