Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 16: Poster Session - Helmholtz Graduate School for Plasma Physics

P 16.4: Poster

Dienstag, 3. März 2015, 16:30–18:30, Foyer Audimax

Experimental study of the radial structure of turbulence with an ultra-fast swept reflectometer in ASDEX Upgrade — •Anna Medvedeva1,2,3,4, Christine Bottereau2, Frederic Clairet2, Garrard D. Conway1, Stephane Heureaux3, Diego Molina2, Ulrich Stroth1,4, and AUG Team11Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, D-85748 Garching, Germany — 2CEA, IRFM, F-13108 St-Paul-Lez-Durance, France — 3Institut Jean Lamour UMR 7198 CNRS, Université de Lorraine, 34 cours Leopold, F-54000 Nancy, France — 4Technische Universität München, James-Franck-Straße 1, D-85748, Garching, Germany

Confinement of fusion plasmas is restricted by anomalous transport where micro-turbulence is suspected to play a major role. Experimental documentation of this turbulence, its dependence on the plasma temperature, density, current will provide insights in the nature of this turbulence and the driving parameters. In this work advantage is taken of the ultra-fast sweep capabilities of the V and W band (50-110 GHz) reflectometers, developed by CEA, to record fast plasma turbulent events on ASDEX Upgrade. The X-mode polarization provides a rather large radial access to the plasma from the very edge to, under certain conditions, the center. The scope of the work is to exploit the specific strengths of the diagnostic in order to study the radial spectra of fluctuations, radial turbulence spreading and the fast dynamic profile evolution after confinement transitions or changes in the discharge control parameters. The latest experimental data obtained during the ASDEX Upgrade campaign 2014 will be presented.

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