Development Of Central Control System Of KRX Device Based On LabVIEW

Keda magnetic Reconnection eXperiment(KRX)is a large-scale space physics experimental platform built to study the electron diffusion region of collisionless magnetic field reconnection and reveal the triggering mechanism of magnetic reconnection.The KRX device uses a large area oxide cathode source to generate background plasma,and utilizes parallel current plates to construct a reconnected magnetic field potential pattern.It requires support from numerous functional systems,including vacuum systems,power supply systems,water cooling systems,magnetic potential pattern construction systems,and plasma source systems.Therefore,developing a central control system with multiple device interactions is an important prerequisite for achieving good operation of the KRX device.In response to the operational requirements of the KRX device,this article designs a central control system based on LabVIEW using virtual instruments and IoT networking technologies.The central control system mainly optimizes the functions of key modules such as the vacuum system,high-power power supply system and water cooling system of the device,and uses the serial port servers commonly used in IoT networking technologies to construct an overall operation control network of the device with the upper computer as the core.According to the overall planning of the central control system,the design and construction of the central control subsystem was completed on the basis of KRX hardware,including:(1)the control and monitoring of the vacuum pump unit and vacuum measuring equipment to ensure that the device obtains a good vacuum environment;(2)the control and monitoring of axial magnetic field power supply,cathode heating power supply,cathode pulse power supply and reconnection drive power supply provide the device with a stable ambient magnetic field,background plasma and reconnection magnetic field configuration;(3)control and monitoring of the water cooling system and related sensors to ensure the safe operation of the oxide cathode thermal plasma source.On this basis,a multi-device interaction network based on serial port servers was established,and relevant sensors were connected to the IoT cloud platform for visual display,further improving the system’s interactivity and security.Finally,the central control system of the KRX device successfully completed the on-site test,and successfully realized the automatic feedback control thermal activation of the oxide cathode plasma source and the regulation of discharge parameters.The temperature climb of the 150kW heat source was stable,the cathode activation was good,and the cathode discharge current reached the level of 10kA at 800℃.The central control system significantly reduces the time cost of laboratory personnel and improves experimental efficiency.At the same time,this reliable,easy-to-expand and transplant control system framework is constructed,providing a foundation for the installation of later experimental diagnosis and testing systems.