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P: Fachverband Plasmaphysik

P 6: Magnetischer Einschluss II / Lichttechnik

P 6.3: Talk

Tuesday, March 29, 2011, 14:55–15:10, HS C

Spatiotemporal energy exchange of nonlinearly coupled drift wave modes — •Christian Brandt¹, Frédéric Brochard², Gérard Bonhomme², Volker Naulin³, Thomas Windisch¹, Olaf Grulke^1,4, and Thomas Klinger^1,4 — ¹Max-Planck-Institut für Plasmaphysik, EURATOM Association, Greifswald — ²Institut Jean Lamour, UMR 7198 CNRS, Dpt P2M, Université Henri Poincaré, Nancy IBP 70239, F-54506 Vandoeuvre-lès-Nancy, France — ³EURATOM Association-Risø National Laboratory, Technical University of Denmark, OPL-128 Risø, PO Box 49, DK-4000 Roskilde, Denmark — ⁴Ernst-Moritz-Arndt Universität, Greifswald

In turbulent systems the nonlinear coupling of modes causes energy transfer between several spatiotemporal scales. In the linear magnetized plasma of the MIRABELLE device drift-wave modes are studied in regimes ranging from coherence to weakly developed turbulence. A fast camera diagnostic is used to record visible light fluctuations of the plasma column in an azimuthal cross section with a temporal resolution of 10 µs corresponding approximatively to 10 % of the typical drift-wave period. The fluctuations of visible light are proportional to the plasma density fluctuations. A spatiotemporal Fourier-decomposition of the camera frames yields information of the energy transfer between the drift-wave modes. The nonlinear mode coupling is quantified by bicoherence analysis. The results are compared to the self-consistent 3D drift-wave code CYTO.