射频负离子源引出电源控制和采集系统设计

Design of Control and Data Acquisition System for Extraction Power Supply of Prototype RF Ion Source

摘要: 中性束注入系统是磁约束核聚变研究中重要的等离子体加热、电流驱动和等离子体控制的手段之一。射频负离子源因其中性化效率高、使用寿命长，成为中性束发展的必然选择。引出电源负责在离子源引出电极与等离子体电极间形成一定的电势差，从而将负离子从等离子体发生器中引出。引出电源输出精度、投放时刻、上升时间和稳定性将直接关系到负离子束的匹配引出及恒定负离子束流的维持。本文设计了一套射频负离子源引出电源控制和采集系统，实现对引出电源高精度输出控制和关键参数的实时采集。测试结果表明引出电源控制和采集系统满足射频负离子源实验需求。

Abstract: Neutral Beam Injection (NBI) is one of the important ways of plasma heating, current driven and plasma control in the research of magnetic confinement fusion. Because of high neutralization efficiency and long service life, NBI becomes the inevitable choice for the development of neutral beam. The extraction power supply is responsible for forming a certain potential difference between extraction grid and plasma grid, so as to extracted negative ions from plasma generator. Output precision, delivery time, rise time, and stability of the extraction power supply are directly related to the matching extraction of negative ion beam and maintenance of constant negative ion beam. In this paper, a control and acquisition system for RF ion source is designed to realize high precision output of power supply and real-time acquisition of key parameters. The test results show the control and acquisition system can meet the experimental requirements of RF ion source.