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Effect of the expanding explosive-emission centers plasma on the impedance of a high-current diode

By: Belomyttsev, S.Y.; Pegel, I.V.; Korovin, S.D.;

1999 / IEEE

Description

This item was taken from the IEEE Periodical ' Effect of the expanding explosive-emission centers plasma on the impedance of a high-current diode ' Formulas for the space-charge-limited electron current in a planar diode with a small hemispherical or hemi-cylindrical plasma emitter have been obtained theoretically and by a numerical simulation. For a periodic cathode structure 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 impedance. This is related to the electric field pressure on the cathode. A configuration of the cathode surface has been proposed which provides realization of this condition.