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(TH/P3-13) Active Feedback Control of Kink Modes in Tokamaks: 3D VALEN Modeling and HBT-EP Experiments

D.A. Maurer1), J. Bialek1), A.H. Boozer1), C. Cates1), O. Katsuro-Hopkins1), Y. Liu1), M.E. Mauel1), G.A. Navratil1), T.S. Pedersen1), M. Shilov1), N. Stillits1)
1) Columbia University, New York, USA

Abstract.  Significant progress in the development of active feedback control as a robust technique for the suppression of the wall stabilized external kink or resistive wall mode (RWM) in tokamaks has been achieved through a combination of modeling and experiments. Results from the 3D feedback modeling code VALEN, which serves as the primary analysis and feedback control design tool for RWM studies on the HBT-EP and DIII-D experiments, are in good agreement with observations. VALEN modeling of proposed advanced control system designs on HBT-EP, DIII-D, NSTX, and FIRE are predicted to approach the ideal wall beta limit in agreement with design principles based on simple single mode analytic theory of RWM feedback control. Benchmark experiments on HBT-EP have shown suppression of plasma disruption at rational edge q values using active feedback control in agreement with model predictions. In addition, the observation in HBT-EP of the plasma amplification of static resonant magnetic fields in plasmas marginally stable to the RWM is in agreement with theory.

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IAEA 2003