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Author(s):
V.D. Pustovitov
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Title:
Ideal and Conventional Feedback Systems for RWM Suppression
Date of publication:
Jan. 2002
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Key words:
resistive wall modes (RWM), cylindrical approximation, feedback suppression
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Abstract:
Feedback suppression of resistive wall modes (RWM) is studied analytically using a model based on a standard cylindrical approximation. Two feedback systems are compared: 'ideal', creating only the field necessary for RWM suppression, and 'conventional', like that used in the DIII-D tokamak and considered as a candidate for ITER. The widespread opinion that the feedback with poloidal sensors is better than that with radial sensors is discussed. It is shown that the 'conventional' feedback with radial sensors can be effective only in a limited range, while using the input signal from internal poloidal sensors allows easy fulfilment of the stability criterion. This is a property of the 'conventional' feedback, but the 'ideal' feedback would stabilise RWM in both cases.
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