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P: Plasmaphysik

P 13: Magnetic Confinement

P 13.1: Vortrag

Donnerstag, 20. März 2003, 11:30–11:50, FO1

MHD modes and electron temperature fluctuations studied by ECE at TEXTOR — •Victor Udintsev¹, Chris Schüller¹, Andreas Krämer-Flecken², Tony Donné¹, Calvin Domier³, and TEXTOR Team² — ¹FOM-Instituut voor Plasmafysica ’Rijnhuizen’, PO Box 1207, 3430 BE Nieuwegein, The Netherlands — ²Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany — ³University of California at Davis, Dept. of Applied Physics, Davis, CA, USA

The influence of MHD modes on plasma transport properties has been studied. A 3D-reconstruction of large m/n = 2/1 modes and their evolution in time have been analyzed. The confinement is improved within the magnetic island, compared to the background plasma. The perpendicular heat diffusivity inside the island is close to the neoclassical value. By cross-correlation of different ECE-Imaging channels, temperature fluctuations in the presence of MHD modes are investigated. For m/n = 2/1 islands, they are found to be larger in the vicinity of the X-point than in the O-point. Evidence of a small mode with higher m number between the q = 1 and 2 radii is given.