Development Of Tokamak Real-time Control Systems Based On LabVIEW

In tokamak experiments,many real-time acquisition,real-time processing and real-time control systems are needed to achieve the control of the plasma and complete the physical research better.In real-time data acquisition and processing,high-speed transmission and stability of large data will be ensured by FPGA at the same time.And it is used in many applications in the current tokamak experiment.For FPGA real-time control system development,it is traditionally implemented in C language with Verilog.The host computer and FPGA can be programed simultaneously by LabVIEW language.And LabVIEW is fully compatible with NI FlexRIO components.The development process is also simplified.Therefore,LabVIEW is more suitable for FPGA development.And more and more real-time system designs choose the LabVIEW development method.In this paper,firstly,the design of a new trigger system of J-TEXT is realized.The new trigger system is more convenient and intuitive to use than the old one.And the problem that the old system clock is often lost and the trigger is often not synchronized is improved.Then,the POLARIS density feedback control system with multi-channel density calculation and the real-time profile inversion are realized.The transmission of data between FPGAs is realized by P2 P technology.The performance of P2 P delay is tested extensively,and its feasibility is verified.Based on the multiple density calculation,the real-time calculation of density profile is realized.And it lays a good foundation for future utilization of the profile.However,the design of the above applications expose many problems.Just like low modularity and poor program readability.It is very unfavorable for maintaining and modifying.So it is summarized by a large number of existing real-time control systems.And a preliminary real-time control system framework is realized.It includes many reusable sub-modules.And then,the existing POLARIS density feedback control system using the framework is reproduced to demonstrate the effect.The size of the block diagram is significantly reduced and a very good modular development is achieved.