采用静电场模拟对二极管结构及导引磁场位形分布进行了优化设计,利用设计的二极管在高压脉冲发生器上进行了重复频率运行实验研究,给出了相应测试波形,并对不同材料阴极、不同真空度情况下二极管的发射特性进行了比较.在二极管真空度满足一定要求(p＜0.01Pa)条件下以在重复频率方式运行时,不论是石墨阴极还是金属阴极,输出电子束流都比较稳定.设计的二极管电子束电压超过500kV,电流约5kA,脉冲宽度40ns,重复频率100Hz.

Based on the static electric-field simulation, the structures of diode and insulator, as well as the position and shape of guiding magnetic-field are designed and optimized. Then the experiments of repetition rate and intense current electron-beam diode are carried out on high voltage generator, and the experimental waveforms are brought forth. The compares of the cathode emission character at different vacuum and different cathode materials are presented. The output electron-beam current of graphite and metal cathode are both stable with repetition rate at the candition of p<0.01Pa. The designed diode can deliver intense electron-beam pulse of 500kV/5kA, pulse width 40ns, repetition rate 100Hz.