Accession Number : AD0747942

Title :   A Study of Aperture-type Electron Lenses with Space Charge,

Corporate Author : GENERAL ELECTRIC RESEARCH LAB SCHENECTADY N Y

Personal Author(s) : Harris,L. A.

Report Date : 21 MAR 1960

Pagination or Media Count : 25

Abstract : The electron optical action of round and slit apertures in the anodes of parallel-plane diodes is investigated. The influence of aperture size on the space-charge-limited current is calculated and included in the determination of paraxial electron trajectories. The results computed by machine are expressed in terms of an effective thin lens whose position and strength are modified from the usual values. The effective focal length is somewhat shorter than predicted by simple lens formulas while the position of the equivalent lens moves farther from the cathode as the aperture size increase. Experiments on devices similar to that analysed give limited confirmation of the theory. They also demonstrate several effects of practical significance which are not treated theoretically. (Author)

Descriptors :   (*ELECTRON LENSES, ELECTRON GUNS), DIODES(ELECTRON TUBES), SPACE CHARGE, MATHEMATICAL ANALYSIS, MICROWAVE EQUIPMENT

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE