Experiment on 4-pulsed intense electron beam source

A four pulsed voltage system (FPVS) has been built based on a 2MeV linear induction accelerator (LIA) injector. With the FPVS, some research on the multipulsed vacuum diode was taken. The pulse duration is 100ns and pulse to pulse duration is less than 500ns. The pulsed diode voltages are around 500kV. In this paper, the work on multipulse emitting characteristics of velvet cathode is introduced. The CCD photos of emitting cathode indicate that the velvet can't emit electrons uniformly under multi-pulse condition. At the same time, the effects of beam load and cathode plasma to multi-pulse emitting and beam to beam electron energy dispersion are also discussed. The experimental results indicate that the cathode plasma can reduce the effective distance between cathode and anode of diode