大动态双聚焦条纹变像管设计

为满足ICF实验中对X射线条纹相机大动态能力的需求，设计了一款大动态双聚焦X射线条纹变像管。其偏转灵敏度为39 mm/kV，静态空间分辨率在阴极中心处优于30 lp/mm，边缘优于10 lp/mm，时间分辨率在10 ps左右，阴极有效长度为30 mm，放大率为1.3，管子总长为425 mm。此款变像管主要通过提高电子飞行速度而缩短电子相互作用时间，从而达到降低空间电荷效应、提高动态范围的目的。最终设计的变像管轴上电势最高16.5 kV，最低5 kV，电子从阴极到达荧光屏的时间仅为6.62 ns。基于设计的变像管参数，对管子进行了加工制造，并进行了初步调试和测试，变像管具有最佳成像效果时各电极实际电压与设计电压几乎一样，放大率为1.35，偏转灵敏度为40 mm/kV，与设计值十分吻合。

Double focusing lens streak tube with wide dynamic range

With the development of the ICF experiment, a streak camera with a wider dynamic range is required. A double focusing lens streak tube with wide dynamic range is designed to satisfy this requirement. Technical parameters of the tube are obtained by optimizing the electrode sizes and voltages values. The deflection sensitivity is 39 mm/kV. The spatial resolution is better than 30 lp/mm in the middle of the photocathode and better than 10 lp/mm at the edge. The time resolution is about 10 ps. The effective length of the photocathode is 30 mm, the magnification is 1.3. Some measures are taken to improve dynamic range, including enhancing the on-axis potential and decreasing the electrode length. As a result, the minimum on-axis potential reaches 5 kV and the flying time of electrons from photocathode to screen is only 6.62 ns. A tube is made based on the designed size. The primary parameters are obtained by testing the tube. The actual voltage values applied to electrodes are almost the same as the designed values. The tested deflection sensitivity is 40 mm/kV and the magnification is 1.35, which both consist with the designed parameters.