Hamburg 2016 – scientific programme
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T: Fachverband Teilchenphysik
T 6: Neutrinomasse I
T 6.5: Talk
Monday, February 29, 2016, 12:05–12:20, VMP5 SR 0079
Gamma induced background in the KATRIN main spectrometer — •Philipp Chung-On Ranitzsch for the KATRIN collaboration — Institut für Kernphysik, Universität Münster
The KArlsruhe TRItium Neutrino experiment (KATRIN) experiment aims to measure the electron neutrino mass with a sensitivity of m(νe)<200 meV/c2. It utilizes a MAC-E-type spectrometer for high-resolution and high-statistics spectroscopy of the β-decay of 3H close to its endpoint of 18.6 keV.
The KATRIN spectrometer and detector section has undergone 3 commissioning phases in recent years, with one of the major goals being the characterization and reduction of the background level. Secondary electrons, that are created inside the main spectrometer by external radiation, e.g. cosmic muons or natural radioactivity gammas, are considered to be one of the main contributions to the remaining background level.
The experimental investigation of the gamma induced background has been twofold. Firstly by exposing the spectrometer wall to an external 50 MBq 60Co gamma source and secondly by introducing additional gamma shielding inside the experimental hall, effectively reducing the flux of natural radioactivity gammas to the spectrometer wall.
This talk gives an overview of the investigations and results concerning gamma induced background in the KATRIN main spectrometer.
The work of the author is supported by BMBF Verbundforschung under contract 05A14PMA.