基于高速采集的垂直位移快速控制的设计与实现

Design and Implementation of Fast Control on the Vertical Displacement Based on High-speed Acquisition

托卡马克装置多采用拉长位形等离子体放电,但是拉长界面的等离子体平衡位形具有天然的轴对称的垂直不稳定性,是造成大破裂的主要机制之一。等离子体的垂直位移控制系统在EAST实验中起着保障装置安全平稳运行,提高等离子体参数性能的作用。垂直位移控制系统的响应速度对时间要求较高。它的响应延迟主要来自于快控电源自身的响应延迟约200μs,各系统间通信带来的延迟约400μs和控制系统响应周期带来的等待延迟约100μs。若要提高控制速度,只能降低系统间通信延迟和控制系统响应延迟。利用新的高速采集设备,从原来的等离子体控制系统中分离出垂直位移的快速控制系统单独控制,系统间利用光纤传输降低传输延迟,提高系统的响应速度。

The plasma balance configuration at the elongated interface has a natural axisymmetric vertical instability, which is one of the main mechanisms of large rupture. The plasma vertical displacement control system plays an important role in EAST experiment in ensuring the safe and stable operation of the device and improving the plasma parameter performance. The response speed of the vertical displacement control system has a strict time requirement. Its response delay mainly comes from three parts: 200 μS,the response delay of the fast control power source itself;400 μS,the delay caused by inter-system communication, and 100 μS,the waiting delay caused by the response cycle of the control system. To improve the control speed, we can only reduce the communication delay between systems and the response delay of control systems.Therefore, the new high-speed acquisition equipment is used in this paper to separate the vertical displacement control system from the original plasma control system, and the fiber optic transmission is used to reduce the transmission delay between systems and improve the response speed of the system.