First implementation of plasma shape GAP control method in EAST.

Preliminary implementation of plasma GAP shape control in EAST is presented. Compared with ISOFLUX method, GAP control could work together with not only real-time equilibrium reconstruction but also real-time boundary reconstruction. Based on the plasma response matrix, the GAP controller is designed and the PID parameter has been optimized for EAST plasma shape control. P-EFIT provides real-time gap calculation and GAP controller is integrated into EAST PCS. Successful plasma shape with GAP control scheme is achieved in EAST 2018 summer campaign. Experimental results prove that GAP control algorithm and controller could achieve similar control ability as ISOFLUX and provide an option for shape control with optical-based boundary reconstruction in EAST and future device CFETR. [ABSTRACT FROM AUTHOR]