Giant oscillations of electron temperature during steady-state operation on Tore Supra.
During fully noninductively driven discharges in the Tore Supra tokamak, large spontaneous oscillations of the core electron temperature (DeltaTe/Te>50%) have been observed for the first time. They occurred during the standard O regime, which is itself characterized by periodic oscillations of much smaller amplitude. The "giant" oscillations appear to involve distinct mechanisms with respect to the O regime and provide a spectacular example of the complex nonlinear interactions between energy confinement, noninductive current sources, and MHD that may occur in a tokamak plasma during steady-state operation.
Association EURATOM-CEA sur la Fusion, CEA/DSM/DRFC, CEA Cadarache, 13108 Saint Paul lez Durance, France.
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