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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.
IAEA 2001
