Design of multi-mode power output control system for neutral beam injection system

To achieve long-term stable operation of nuclear fusion under high-performance conditions, the full-superconducting tokamak experimental device (EAST) was established. Neutral Beam Injection (NBI), an efficient auxiliary heating method, is the foundation for EAST experiments to reach their upper limit. The NBI Control System (NBICS) centrally manages NBI experiment operations and achieves field control. With the increase in experimental achievements and the increasing goals of EAST experiments, more requirements are appearing on the neutral beam injection. To ensure the richness of future experimental operations, a multi-mode injection control system for neutral beams has been developed. The new system adds feedback control and follow-up control modes to the existing open-loop control. Compared with the past, feedback control perfectly solves the problem of beam current slowly decreasing under long pulse widths and follow-up control improves the richness of experiments. The multi-mode control system uses LabVIEW language, RT operating system, and FPGA hardware which achieve functions such as parameter configuration and PID adjustment. This paper introduces the design and development of the multi-mode power output control system for neutral beams.