State-Space Parameter Modeling Tool for Enhanced Mode Discrimination and Feedback Control

72753S03-I The Resistive Wall Mode (RWM) is a major instability that limits performance in current and projected future advanced tokamaks. Active control of the RWM using external coils to cancel RWM magnetic flux has been shown effective in stabilizing the mode. This control scheme requires both accurate isolation of the mode flux from the total flux and accurate modeling of system responses to the mode flux. This project will develop a flexible desktop tool to facilitate the calculation of the mutual couplings of the plasma-wall-coil-sensor system in a three-dimensional toroidal geometry that can be easily modified to test different systems. This tool also will facilitate construction of system response models for effective RWM detection. In Phase I, a vacuum field code will be modified to model the resistive wall and RWM structure as current eigenmodes. The extended code will then be used to calculate the mutual plasma-wall-coil-sensor couplings in a flexible manner such that alternative geometries can be easily implemented. Commercial Applications and Other Benefits as described by awardee: The modeling tool should provide a flexible desktop tool for system-response modeling of active feedback. The nature of the tool should allow it to be easily used by researchers for a variety of systems, enabling its quick application to any current or future tokamak.