Current pulse shaping in electron gun using ferroelectric cathode

We have operated an electron gun using a ferroelectric cathode at a diode v oltage of 450 kV. The beam current and its waveform have been studied under various triggering conditions. Adjusting the amplitude and applied timing of the trigger pulse has led to a unique method of current pulse shaping fo r the ferroelectric diode. The method is convenient and the beam current wi th a reasonable pulse shape is achievable even with a relatively poor condi tion of the voltage pulse. Optimum conditions for applying the trigger puls e have been determined and the beam current with the required shape is obta ined.