Title :
Effect of the expanding explosive-emission centers plasma on the impedance of a high-current diode
Author :
Belomyttsev, Svyatoslav Ya ; Korovin, Sergei D. ; Pegel, Igor V.
Author_Institution :
Inst. of High-Current Electron., Acad. of Sci., Tomsk, Russia
fDate :
12/1/1999 12:00:00 AM
Abstract :
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
Keywords :
plasma diodes; plasma pressure; plasma simulation; plasma transport processes; Child-Langmuir law; blade-type diode; cathode plasma expansion; cold cathode; diode impedance; diode perveance; electric field pressure; emission surface discontinuity; emitter current; expanding cathode plasma; expanding explosive-emission centers plasma; hemi-cylindrical plasma emitter; hemispherical plasma emitter; high current explosive-emission diodes; high-current diode; numerical simulation; periodic cathode structure; planar diode; space-charge-limited electron current; time dependence; Cathodes; Diodes; Electron beams; Electron emission; Periodic structures; Plasma density; Plasma simulation; Plasma stability; Surface impedance; Voltage;
Journal_Title :
Plasma Science, IEEE Transactions on
