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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
, with only a single harmonic variation in
. 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.
IAEA 2001