A function parametrization method used for plasma current center estimation

For efficient and safe operation of EAST, it is necessary to accurately identify and control the plasma current, radial and vertical positions. A plasma control system is successfully used for EAST plasma shape control. In the RZIp control scheme, the plasma radial and vertical positions are evaluated through the E-matrix. A function parametrization method, which needs large volume of database for magnetic measurements and plasma position, is employed to obtain the E-matrix. The database is generated through EAST discharge simulation using the tokamak simulation code (TSC), which has excellent agreement with experimental data. The built E-matrix is verified by test data generated by TSC simulation and experimental data within the error limits.