Hannover 2013 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 11: Infrared and Microwave Spectroscopy

MO 11.6: Vortrag

Dienstag, 19. März 2013, 12:15–12:30, F 107

First Measurements with TApIR (Tritium Absorption IR-Spectroscopy) — •Alexander Beck and Robin Größle — Karlsruher Institute of Technology (KIT), Karlsruhe, Germany

For a continual operation of the future fusion facilities like the International Thermonuclear Experimental Reactor (ITER) a constant feeding ratio of tritium and deuterium into the fusion chamber is essential. To ensure a constant feeding ratio, a system for measuring the tritium and deuterium concentration at certain steps in the fuel cycle has to be provided.

One important capability of these fuel cycles is to reprocess unburned fuel and to purge tritium and deuterium. For hydrogen isotopologue processing the Isotope Separation System (ISS) is available, applying a cascade of cryogenic distillation columns to enrich the T2.

Before reinjecting the tritium back to fusion process, its purity has to be measured to ensure the constant feeding ratio to the plasma. IR-spectroscopy has been selected to proof its capability as a reliable, reproduceable, fast and non invasive analytic technique for composition analysis of liquid hydrogen mixtures.

The development of an IR-sensor-system started with the TApIR experiment, a sample cell for IR-spectroscopy on the liquefied hydrogen isotopologues protium and deuterium. The first measurements have been taken and several aspects, like background development of the IR-source and the detector system need to be considered to extract the pure spectral information of the hydrogen isotopolgues for further analysis.