The study of Resistive Wall Mode behavior based on potential Energy analysis and feedback control in Reversed Field Pinch

摘要

The resistive wall mode (RWM) instability and its active feedback control[1] are important issues for different kinds of advanced fusion devices. In RFPs, RWMs as current driven modes, having their rational surfaces outside the plasma, exist as so called externally non-resonant modes (ENRMs),which have their rational surfaces located at q < q(a) <0 (q(a) is the safety factor at the plasma edge); and internally non-resonant modes (EMRMs) with rational surfaces corresponding to q >q(0) >0. In order to better understand the Resistive Wall Modes (RWMs) behavior and RWM feedback in RPP plasmas, it is essential to investigate the driving mechanisms of RWM instability and how a feedback system affects the RWMs growth rate.