Control Development Supporting Long-Pulse and ITER-like Scenarios on KSTAR

Control developments, including porting a Proximity Controller to aid in continuous disruption prevention and upgrading the existing Real-Time Feed-Forward algorithm for robust and reliable shape control during long-pulse sustainment and ramp-down, are planned for the upcoming KSTAR campaign to support long-pulse, ITER-like scenarios on KSTAR with the new tungsten divertor. The proximity controller calculates the proximity to known stability limits and guides the plasma state away from those limits. First application of the Proximity Control will be for robust vertical displacement event avoidance. The Real-Time Feed-Forward algorithm regularly updates the feed-forward coil current targets based on changing plasma conditions, and is used in conjunction with feed-back for reliable shape control. Upgrades to the real-time feed-forward will expand on this work to handle evolving resistivity and target shapes, as well as to aid both scheduled and un-scheduled ramp-downs.