Bochum 2015 – scientific programme
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P: Fachverband Plasmaphysik
P 15: Poster Session - Magnetic Confinement
P 15.1: Poster
Tuesday, March 3, 2015, 16:30–18:30, Foyer Audimax
Experimental and numerical investigations of the energy confinement times in the stellarator TJ-K — •Ahmed Ali1, Alf Köhn1, Alejandro Muñoz1, Eberhard Holzhauer1, Gregor Birkenmeier2, and Mirko Ramisch1 — 1Institute of Interfacial Process Engineering and Plasma Technology IGVP, Uni Stuttgart, Stuttgart, Germany — 2Max-Planck Institute für Plasmaphysik, Garching, Germany
A particle and power balance model has been employed to numerically simulate and qualitatively understand transport processes, which determine equilibrium density and temperature profiles in the stellarator TJ-K. To quantify losses by these processes, the e-folding time of density and energy after switching off the heating source is used as a measure of the corresponding confinement times. For comparison with numerical simulation, both quantities are investigated experimentally in TJ-K. The particle confinement can be directly deduced from an interferometer or from Langmuir probes measuring the ion-saturation current. A commercial satellite receiver is used to measure the emitted radiation around 12 GHz, which is assumed to be dominated by Bremsstrahlung. In addition, the signal from a fast diode, which is sensitive in the visible range of light, is used. Results of the comparative numerical and experimental studies will be presented.