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为了准确了解电子束随时间变化的性能,在神龙一号直线感应加速器上进行电子束束参数测量时要求测量系统精确地同步于电子束的产生和输运．其功率系统开关放电波形后沿幅度高达250kV,下降时间约20m,并且从该下降沿到电子束打靶的时间有145m,抖动1-2ns,非常稳定;如果以陡峭的后沿作为测量时间基准,则可以获得与其抖动相同量级的同步精度．因此通过对其波形的下降沿进行微分来获取测量系统的触发信号,选择合适的微分参数可以得到对应于下降沿约n8级精度的测量时间基准,通过采用光纤驱动电路完全消除了高压开关对低压测量系统的干扰,保证测量系统正常工作．该方法消除了传统触发方式因延时长、精度低、抖动大等对确定测量时间基准的不利影响,满足了使用高速测量设备准确获取电子束不同时刻的束参数波形的精确触发要求．
In order to accurately understand the performance of the electron beam over time, the measurement of the electron beam parameters on the Shenlong-IV linear accelerator is required to accurately synchronize the electron beam generation and transport. The power system switching discharge waveform amplitude of up to 250kV, down time of about 20m, and from the falling edge to the time of electron beam shooting 145m, jitter 1-2ns, very stable; if the steep edge as a measurement time base, You can get the same level of jitter and synchronization accuracy. So by measuring the falling edge of the waveform differential to obtain the measurement system of the trigger signal, select the appropriate differential parameters can be obtained corresponding to the falling edge of about n8 precision measurement time base, through the use of fiber-optic driver circuit completely eliminate the high-voltage switch low voltage Measuring system interference, to ensure the normal operation of the measurement system. The method eliminates the disadvantage of traditional triggering methods such as long delay, low accuracy, large jitter and the like, and thus meets the precise triggering requirement of accurately acquiring the beam parameters at different times of the electron beam using the high-speed measuring equipment.