Abstract: Given the low-speed data acquisition system can not accurately characterize the electrical signal, a high-speed data acquisition system for key signals of negative ion source neutral beam injection system (NNBI)breakdown is designed to acquire reliable and accurate data for key signals during the breakdown. This system consists of a high-speed data acquisition board, an acquisition host computer and a data server to achieve microsecond-level acquisition speed. In terms of the transient and randomness of breakdown, pre-trigger and random-trigger are adopted to measure key signals, which can obtain complete data at the moment of breakdown and greatly save the cost during long pulse data acquisition and storage of NNBI.

Key words: Neutral beam injection, Negative ion source, High-speed data acquisition, Breakdown

摘要： 为了弥补负离子源中性束注入系统(NNBI)低速数据采集系统的打火瞬间对关键信号波形无法精确表征，设计了 NNBI 打火瞬间关键信号高速数据采集系统，由高速数据采集板卡、采集上位机和数据服务器组成，实现了对打火瞬间关键信号的微秒量级的采集。针对打火事件具备瞬时性和随机性的特点，采用预触发和随机触发方式，对打火瞬间关键信号数据进行高精度测量，大幅节约了存储成本，解决了 NNBI 打火瞬间关键信号采样精度低、长脉冲采集存储成本高的问题。该系统在测试中安全稳定运行，采集结果达到实验要求，为投入 NNBI 长脉冲注入实验进行高精度数据采集奠定基础。

关键词: 中性束注入, 负离子源, 高速数据采集, 打火