Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 7: Experimental Techniques 1

MO 7.6: Vortrag

Dienstag, 18. März 2014, 11:45–12:00, BEBEL SR144

Accurate calibration of a Laser Raman system with (H,D,T) gas mixtures in thermodynamic equilibrium — •Simon Niemes and Marco Röllig — Karlsruhe Institute of Technology, ITEP-TLK, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen

The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to measure the neutrino mass via high-precision electron spectroscopy of the tritium beta decay with a sensitivity of mν=200 meV/c2 (90% C.L.). This can only be achieved if systematic uncertainties are minimized. An important parameter is the isotopic composition of the gaseous beta electron source which is measured inline by Laser Raman spectroscopy. The KATRIN experiment requires a measurement trueness of better than 10% for the gas composition. Here we present a gas sampling technique for the calibration of the Raman system, with all hydrogen isotopologues (H2, HD, HT, D2, HT, DT, T2). A tritium compatible loop will be set-up at the Tritium Laboratory Karlsruhe (TLK) to produce binary hydrogen gas mixtures in thermodynamic equilibrium and with well-known isotopic composition. Further analysation of the gas mixtures produced for the LARA calibration will be done by gas chromatography, mass spectroscopy and beta induced x-ray spectrometry.

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