Control of RFP Dynamics Using External Helical Fields

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京都工芸繊維大学　工芸学部研究報告　第５０巻　理工・欧文(2001) pp.37-54Control of the MHD mode dynamics is essential to improving　Reversed field pinch （RFP）experiments as a part of the fusion 　research programs. Influence of the static and rotating helical fields　on the RFP dynamics has been studied in the STE-2 RFP to test the　ides of the use of helical field for the control of MHD modes.　Emphasis is put on the resistive wall modes which play important roles in future RFPs where plasma lifetime is much longer than the　field penetration time of the wall. Static resonant helical field brings about unfavorable effect, as expected, by enhancing the magnetic　islands, while rotating resonant field is shown to be a possible tool for the control of tearing mode dynamics. The effect of externally　nonresonant field on external kink modes is also discussed.
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