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Abstract. Control of MHD mode dynamics is essential to improving the
reversed field pinch (RFP) experiments as a part of the fusion research
programs. The STE-2 RFP has been operated only with a vacuum vessel (
0.15ms) to test the idea of driving MHD mode and/or plasma
rotation by using resonant rotating helical field
(RHF) which is applied from outside of the vessel. We report new results
which indicate direct interaction between the RHF and inherent tearing
modes. Without the RHF, the magnetic disturbance outside the vessel is
dominated by almost locked m/n=1/8 core resonant tearing modes, growing with
the scale of vessel time constant. The RHF tends to drive the mode rotation
with a transient suppression of the mode growth. Improved RFP performance
has not become clear yet. Stabilization of the external kink modes will also
be discussed.
IAEA 2001