Accession Number : AD0736462

Title :   Study of Plasma Sheaths.

Descriptive Note : Final rept. 1 Feb 68-1 Jul 71,

Corporate Author : MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Oskam,Hendrik J. ; Peng,James L.

Report Date : AUG 1971

Pagination or Media Count : 88

Abstract : Results obtained from a study of current-voltage characteristics of gas diodes with and without positive ion injection are reported. It was found that ions are very effective in neutralizing the negative space-charge barrier in front of the thermionic emitter. Pulsed ion injection studies showed that the rate of loss of positive ions from the barrier region decreases with increasing barrier height and decreasing diffusion coefficient of the injected ions. These results were consistent with those obtained during the steady state studies. A theoretical model of a gas diode with and without ion injection was constructed. This model was numerically solved for a gas diode without ion injection for various experimental conditions. The results obtained indicate the desirability to extend the calculations to a gas diode with ion injection in order to explain the observed large space-charge neutralization efficiencies of the injected ions. (Author)

Descriptors :   (*THERMIONIC CONVERTERS, *SPACE CHARGE), (*PLASMA SHEATHS, THEORY), ION BEAMS, BOUNDARY VALUE PROBLEMS, BOUNDARY VALUE PROBLEMS, CATHODES, ANODES, ELECTRON DENSITY, DIODES(ELECTRON TUBES), COMPUTER PROGRAMS

Subject Categories : Electric Power Production and Distribution
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE