Accurate Current Drive Modeling on EAST

A nonlinear transformer model is used for describing the tokamak discharge with fraction of noninductive current. The nonlinear model accurately identifies the tokamak as a toroidal transformer by a voltage balance equation. In order to verify the feasibility of the application of the nonlinear model in the experimental advanced superconducting tokamak (EAST), the voltage balance equation is checked for the different scenarios and applied to calculate and analyze the noninductive current in shots #73999 and #66740, respectively. Calculation results indicate that the #73999 shot H-mode plasma discharge is full noninductive current drive and occupies approximately 99% of plasma current. It is a good agreement with the simulation result (98%) by the integrated modeling under the framework OMFIT with equilibrium code EAST equilibrium fitting (EFIT), and transport codes TGYRO and ONETWO in EAST. For the #66740 shot, it is nearly full noninductive current drive.