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(EXP4/13) Control of RFP Dynamics with External Helical Fields

S. Masamune, M. Iida, H. Ueda, Y. Sugimoto, T. Murakami, H. Sugie, K. Ohta, H. Oshiyama

Department of Electronics and Information Science, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

Abstract.  Attempts have been in progress to control dynamics of the reversed field pinch (RFP) plasma by use of external helical fields in the STE-2. In the quasistatic field experiments, it has been found that combined application of different resonant fields causes enhanced mode coupling. Stability analysis has shown that one of the possible mechanisms for the experimentally observed RFP improvement due to external nonresonant fields is the stabilizing effect of the external current layer to external kink mode which grows in the time scale of shell time constant. In the rotating resonant helical field experiments, it appears that toroidal rotation of the asymmetric toroidal flux disturbance is either acceletared or decelerated depending on the rotation direction of the helical field. No significant effect has been observed on the global plasma parameters under the present limited experimental conditions.

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IAEA 2001