Analysis of resistive wall mode LQG control in NSTX with mode rotation

摘要

Stabilization of the Resistive Wall Mode (RWM) in the NSTX tokamak is important to achieve high-beta plasmas. This paper numerically investigates state-space control algorithms for improved performance of RWM control using the existing six external control coils with off-midplane poloidal magnetic field sensors in NSTX. Experimentally (beta)_(N) velence 5.6 was achieved with the present proportional gain controller. The proposed LQG controller is capable of reaching (beta)_(N) velence 6.7 for slowly rotating plasma modes and the ideal wall limit (beta)_(N) velence 7.06 for plasma modes with higher natural rotation speed.