Experimental characterization and modelling of the resistive wall mode response in a reversed field pinch

Abstract Model-based control algorithms have potential advantages for resistive wall mode (RWM) feedback control. In this study, a physics model of the RWM response to externally applied perturbation fields is validated against experiments in reversed field pinch (RFP). The experimental characterization plasma performed EXTRAP T2R device by excitation nonaxisymmetric magnetic utilizing an external array saddle coils modelling and validation carried out with extended sensor array, resolving wider spectrum compared earlier studies, covering relevant poloidal m = 1 toroidal $ - 32 < n 32$?> − 32 &lt; n modes high aspect ratio RFP device. addition nonresonant unstable modes, which are primary target control, also includes wide range resonant modes. magnetohydrodynamics (MHD) passive stabilization effect on these from intrinsic rotation. inclusion resistivity rotation present provides substantially better agreement between modelled growth rates than that observed studies using ideal MHD model. realistic description both relatively simple compatible computing capabilities latency limitations encountered practical implementations model-based algorithms.