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(THP2/01) Theoretical Modeling of the Feedback Stabilization of External MHD Modes of Toroidal Geometry

M. S. Chance¹⁾, M. S. Chu²⁾, M. Okabayashi^1)
 
1) Princeton Plasma Physics Laboratory, Princeton, NJ, USA
²⁾ General Atomics, San Diego, CA, USA

Abstract.  A theoretical framework for understanding the feedback mechanism against external MHD modes has been formulated. Efficient computational tools - the GATO stability code coupled with a substantially modified VACUUM code - have been developed to effectively design viable feedback systems against these modes. The analysis assumed a thin resistive shell and a feedback coil structure accurately modeled in $\theta$, with only a single harmonic variation in $\phi$. An optimized configuration and placement of the feedback and sensor coils as well as the time constants and induced currents in the enclosing resistive shell have been computed for the DIII-D device. Up to 90% of the effectiveness of an ideal wall can be achieved.

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