The Design And Implementation Of HL-2M Plasma Control System

Nuclear fusion is an important way for generating sustainable energy in future.Tokamak experiment is a way to research the controlled nuclear fusion.HL-2M is a tokamak device with a complex plasma control strategies.Plasma control is one of the most important conditions in Tokamak experiment.To keep the stability of the plasma,a system that control the shape,discharging,kinetics and instability of the plasma in real-time is necessary in tokamak experiment.And besides,the experimental datacan be store and provided to the researchers.The conceptions and technologies of the plasma control system in the HL-2M and othertokamaksat home and abroad are studied inthis paper studies.A new plasma control system based on the above researcheshas been designed and realized for HL-2M.A system prototype based on abstraction and modularity has been designed to implement plasma control.A multi-thread parallel framework based on real-time operation system is designed in the system.Several plasma control modules are developed and integrated by the framework in the new plasma control system.The modules are implemented and test in the Tokamak experiment,which verifies the availability of the system.Besides,several non-real-time services are designed to support the real-time modules.A modular architecture is adopted to design the HL-2M PCS.The categories of plasma control are translated into modules in the new PCS.Areal-time multi-thread parallel framework is designed to provide a real-time environment and management for themodules,which ensures the real-time responsive of the system.Several abstract interfaces are designed in the PCS to specify the modules,which simplifiesthe development of modules.All of the modules in PCS can be realized by inheriting from the interface.Besides,a solution for integrating control modules into the new PCS is preferred in this paper.Several control modules has been developed and integratedinto HL-2M PCSbased on the modular architecture,including plasma real-time reconstruction module,tearing mode control module,plasma current and position control module,etc.In addition,performance optimization has been made for every modules.The modules have been implemented and test in HL-2A experiment.Improvement plans for modules in PCS have been made according to the characteristics of HL-2M control system.Several non-real-time services have been designed to support the real-time tasks,such as parameter configuration,remote access,messaging service.Some internet technologies,such as database,cloud computing have been adopted in the design.The target ofthe systemdescribed in this paper is HL-2M plasma control.In order to verify the reliability of the system,it has been deployed in HL-2A Tokamak and make a good performance in the experiment.The new plasma control system has absorbed the related technologies of several Tokamak at home and abroad including ITER.Besides,the plasma control system provides a reference schemefor plasma control systemson the other Tokamaks in the future.