Magnetics control simulations for KSTAR plasmas

Simulation studies on magnetics control for the proposed Korea Superconducting Tokamak Advanced Research (KSTAR) plasmas are presented. Here, the magnetics control includes the fast time scale (∼10 ms) plasma position control, the slow time scale (∼1 s) plasma shape and current control, and the control of resistive wall modes (RWM). The plasma position control is realized by using two pairs of inner control coils inside KSTAR vacuum vessel. The plasma shape and current control is achieved by using superconducting poloidal field (PF) coils in KSTAR. The voltage limitations in PF coil power supplies are taken into account in the simulation. A set of 12 in-vessel control coils, which are mounted on the inner wall of KSTAR vacuum vessel, are used for the control of RWMs. The required feedback currents in in-vessel control coils for the stabilization of RWMs are estimated.