在注入器段阳极杆内不同位置进行电子束包络的测量可以为多脉冲电子束在注入器段的传输磁场配置调试提供最直接的支撑,也是研究热阴极发射性能的重要手段,测量工作具有极为重要的意义。神龙二号采用热阴极作为多脉冲电子束源的发射体,对真空的要求极高,且加热及降温周期较长,不适合频繁地破坏真空进行测量位置的调整;针对这样的特点,设计了一套可伸缩式的测量装置,结合多幅分幅相机,在不破坏真空的情况下,可以完成多个位置的束包络的时间分辨测量,在提高测量效率的基础上进一步提高了注入器的调试效率。 The measurement of the electron beam envelope at different positions in the anode rod of the injector section can provide the most direct support for the transmission field configuration and debugging of the multi-pulse electron beam in the injector section. It is also an important method to study the hot cathode emission performance. The measurement work has Very important meaning. Shenlong II adopts hot cathode as the emitter of multi-pulse electron beam source, which has extremely high requirements on vacuum and long heating and cooling cycles, which is not suitable for frequent vacuum damage and adjustment of measuring position. In view of such characteristics, A telescopic measuring device, combined with multi-frame cameras, can perform time-resolved measurement of beam envelopes at multiple locations without breaking the vacuum and further improve the efficiency of the injector The debugging efficiency.