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

Volume

27

Issue

6

fYear

1999

fDate

12/1/1999 12:00:00 AM

Firstpage

1572

Lastpage

1577

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;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.808928

Filename

808928