Sy. Belomyttsev et al., Effect of the expanding explosive-emission centers plasma on the impedanceof a high-current diode, IEEE PLAS S, 27(6), 1999, pp. 1572-1577
Formulas for the space-charge-limited electron current in a planar diode wi
th a small hemispherical or hemi-cylindrical plasma emitter have been obtai
ned theoretically and by a numerical simulation. For a periodic cathode str
ucture of hemispherical emitters, an approximate expression for current is
derived. Based on these results, the increase in current with time in high-
current explosive-emission diodes is explained, A condition has been found
under which the expanding cathode plasma has no effect on the diode impedan
ce. This is related to the electric field pressure on the cathode. A config
uration of the cathode surface has been proposed which provides realization
of this condition.