Electron gun with a ferroelectric material cathode
The simulation and experimental r esults of electron gun with a ferroelectric material cathode by author in Cornel l university are presented in this paper. The results show that the current den sity is of order 110A/cm 2, experimentally. The current generated with the fer roelectric material cathode exceeds space charge limited current. It is consider ed that this is caused by the electric field enhancement adjacent to the cathode surface, due to the introduction of trigger pulse, FE effect, and grid structur e etc. Enhanced electric field will accelerate electrons to some energy in the d istrict near cathode surface. According to this, the electron gun with ferroelec tric material cathode can be reasonably simulated and designed by assigning inje cting electrons from cathode with an effective initial energy.