TSC Simulation and Prediction of Ohmic Discharge in EAST

Full text: EAST is the full superconducting tokamak with D-shaped cross-section, which forms different plasma shape with elongation of 1.5 - 2.0, triangularity of 0.3 - 0.5, major radius of 1.8 m and minor radius of 0.4 m. The Tokamak Simulation Code (TSC), a two-dimensional time dependent free boundary simulation code, has been a very useful tool both in analyzing experimental data and designing future tokamaks for many years. It has been used to model the time dependence of ohmic discharges in the EAST experiment for several years. The simulation results follow the experimental PF current, plasma current and position to a very good accuracy. Neoclassical resistivity gives good match with the measured surface voltage. On the basis of one good simulation, several predictions with different shape evolutions, such as elongated limiter and diverted configuration, have been done by TSC. These predictions provide reference wave (PF currents, plasma density, plasma current, and plasma position) for PCS (Plasma Control System) to direct plasma discharges. These discharges follow predictive trajectories very well. It proves the ability of TSC as predictive tool for EAST plasma discharge, and gives us a good confidence to predict 1MA ohmic discharge on EAST. (author)