Development of real-time plasma current profile reconstruction with POINT diagnostic for EAST plasma control

Highlights: • Plasma current profile reconstruction algorithms using POINT are implemented with GPU parallel computation in P-EFIT code. • P-EFIT using experimental magnetic plus POINT data could provide reasonable plasma current density and q profile results. • A real-time POINT DAQ system and data interface between PCS and P-EFIT's GPU server are built. • This system could satisfy time feasibility requirements for real-time plasma control. • This work is essential for advanced tokamak real-time plasma current profile control to maximize performances. - Abstract: This paper describes the plasma current profile reconstruction algorithms using POlarimeter-INTerferometer(POINT) measurements in GPU parallel equilibrium reconstruction code P-EFIT for EAST plasma control. Real-time POINT diagnostic data acquisition system is designed to satisfy the requirement for real-time reconstruction. The static time-slice and experimental simulation benchmark calculations using experimental magnetic plus POINT data of EAST discharge are conducted, which show that P-EFIT could provide reasonable plasma current and q profile in 0.7 ms in real-time with 65 × 65 spatial grid resolution. These results show that P-EFIT with POINT diagnostic could provide equilibrium reconstruction results for real-time plasma current and q profile control which will be applied in the near future.