A Toolset for Kalman Filter Resistive-Wall-Mode Feedback Modeling Including Plasma Rotation

The Resistive Wall Mode (RWM) is a major instability that limits performance in current and projected future advanced tokamaks. Although the RWM is an instability that is directly related to plasma rotation, all feedback controls to date have been developed assuming no plasma rotation. Thus, more accurate RWM feedback modeling that includes plasma rotation would lead to an enhanced capability for active feedback control. This project will develop and validate an easy-­to-­use Kalman filter RWM feedback control model that includes plasma rotation. A rotation-­compatible model-­based RWM feedback controller not only would provide accurate RWM mode identification in a noisy situation but also would incorporate torque-­based rotation control for RWM feedback. In Phase I, the rotation-­compatible RWM model was completed. Model predictions were in good agreement with experimental data. In Phase II, the rotation­compatible model will be enhanced to include non-­axisymmetric field effects, as well as an externally driven torque source or sink. Commercial Applications and other Benefits as described by the awardee: The rotation-­compatible RWM model should lead to the development model-­based controllers that are essential for the success of advanced tokamak operation. The flexible and desktop nature of the modeling tool should facilitate the quick modeling of many different geometries and feedback methods. Its enhanced productivity would make the tool attractive to scientists interested in studying RWM active control on any toroidal devices