Design Of Real-time Control Framework And Application Of Real-time Plasma Control Based On LabVIEW

In order to conduct physical experiment research in a tokamak device,many systems are usually required to provide support,including power supply systems,heating systems,and diagnostic systems.Although the control algorithms are different for different systems,the entire control process is similar.Therefore,it is necessary to develop a set of real-time control framework to provide unified functional support for different systems.The Lab VIEW language is widely used in J-TEXT,combined with NI's hardware to form a realtime control system.Therefore,in order to overcome the complex block diagrams,the low information density and other shortcomings of Lab VIEW language in writing large scale programs,and to make full use of its native support for high-speed FPGA boards and realtime systems,this paper develops a real-time control framework based on Lab VIEW and has been used in different real-time control systems of J-TEXT.The real-time control framework designed and developed in this paper based on the requirements of each system is a framework that can support multiple timing cycles as well as different hardware,and is flexible,modular,and easy to expand.Using the idea of modular programming,different sub-functions in the real-time control system are implemented as sub-VIs for users to call.Users only need to organize the different modules and modify the corresponding control algorithms to build a suitable real-time control system quickly.Based on the realization of the framework,this article focuses on the application of the framework in different systems.It mainly includes the application in the bias power supply system based on CPU timing,so that the bias power supply can provide the bias coil with a bidirectional current of 2k A;the application of the FPGA board and adapter module in the high-speed signal acquisition of the polarimeter diagnostic system,which can provide a maximum acquisition rate of 120M/s to collect the intrinsic signal;the application in the calculation of the real-time plasma density profile based on the diagnosis of the microwave reflectometer,and the real-time online calculation of density profile using the diagnostic data of the microwave reflector through the FPGA board and adapter.The developed realtime control framework can meet the requirements of different real-time control systems.The real-time control framework based on LabVIEW in this article not only improves the speed of developing programs,but also facilitates communication between developers in the laboratory and provides a new real-time control framework for the J-TEXT,which is easy to expand and transplant.