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Report No.
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Mode rigidity study of RWM on RFX with reduced RWM control coils for JT-60SA RWM stabilization

Takechi, Manabu; Bolzonella, T.*; Baruzzo, M.*; Ide, Shunsuke; Matsunaga, Go; JT-60SA Team

To achieve a steady-state high beta plasma, suppression of RWM is necessary. Therefore, the RWM active control system for JT-60SA is being designed. The matter of mode-rigidity is very important for JT-60SA, because the coverage area of plasma surface with coils is very small. There are two issues connected to mode non-rigidity. One is mode deformation and the other is the destabilization of side-band modes which are marginally stable without the control coils. We performed some experiments on the RFX-mod device with reduced sets of coils for mode-rigidity study. The active control system of RFX-mod has 192 coils each with an independent amplifier and successfully controls RWMs. For example, by using only 48 coils in the top poloidal section one can control the RWM. The dependence of mode control efficiency, mode deformation derived by magnetic sensors and amplifier current on coverage area of the coils during mode control will be shown.

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