神龙二号多脉冲电子束束参数的时间分辨测量技术

神龙二号是一台三脉冲强流脉冲电子束直线感应加速器，就其多脉冲的电子束束参数的测量而言，基本要求是单个脉冲可分辨，进一步的要求是脉冲内时间可分辨。基于光学渡越辐射原理及瞬态发射度测量系统原理，发展了一种束斑与发散角可以分开测量的光学布局结构，结合多台高速分幅相机，成功研制了一套完整的多脉冲电子束束参数的测量系统，其特点是灵活的组合测量方式，全面满足了神龙二号复杂艰难的调试及参数测量工作要求。测量系统最高时间分辨测量能力达到约2 ns的水平，单个脉冲可以获得至少8个时间分辨的束参数测量结果。

Time-resolved multi-pulsed electron beam parameters measurement technique for Dragon Ⅱ LIA

Dragon Ⅱ is a linear induction accelerator which can shoot 3 coaxial pulsed high intense current electron beams at one time. The distinguished beam parameters between electron beam pulses should be achieved at least for its multi-pulsed electron beams. The high time-resolved beam parameters inside an electron beam pulse are important. One set of complicated electron beam parameters measurement system has been specially developed recently for Dragon Ⅱ LIA. The optics layout for beam profile measurement and beam emittance measurement individually being carried out is developed from the structure of instantaneous electron beam emittance measurement system based on the optical transition radiation principle. Multi framing cameras are adopted in the system. This system features very flexible assembled measurement ability. It meets the diversified demands for very difficult debugging work and beam parameters measurement of Dragon Ⅱ LIA. The highest time-resolved ability is up to 2 ns and at least 8 results of time-resolved beam parameters inside one pulse can be obtained at one time.