Accession Number : AD0615939

Title :   INVESTIGATION OF LINEAR BEAM AND NEW CONCEPTS OF MICROWAVE POWER. VOLUME II. BEAM-CIRCUIT ACTION.

Descriptive Note : Quarterly progress rept. no. 4, 1 Jul-30 Sep 64,

Corporate Author : CORNELL UNIV ITHACA N Y ELECTRICAL ENGINEERING RESEARCH LAB

Personal Author(s) : Wang,S. C. ; Walder,J.

Report Date : APR 1965

Pagination or Media Count : 229

Abstract : A method is described to improve both the gain and efficiency of conventional klystrons by varying the beam impedance through the change of d-c beam voltage at appropriate locations along the beam. Results are given in both small- and large-signal analyses for two- and three-cavity klystrons with gridded- and gridless-gap resonators. Analytical expressions of beam-loading conductance for a transformed beam interacting with both gridded- and gridless-gap resonators are derived. From small-signal theory the efficiency was found to be directly proportional to M squared/G and the gain to (m sub b M) squared/G (where M is the beam-coupling coefficient, G is the beam-loading conductance, and m sub b is ratio of transformed beam velocity to original beam velocity). This is valid in the large-signal domain, provided that M and G are a-c voltage independent. The large-signal efficiency was found to be dependent on a-c velocity spread only after the transit angle of the output gap decreased to a certain limit. The best location for putting bias was found to be the point of a-c velocity minimum. (Author)

Descriptors :   (*ELECTRON BEAMS, MICROWAVE FREQUENCY), (*RADIOFREQUENCY POWER, MICROWAVE FREQUENCY), (*CIRCUITS, ELECTRON BEAMS), (*KLYSTRONS, ELECTRON BEAMS), PLASMAS(PHYSICS), CAVITY RESONATORS, GAIN, SPACE CHARGE

Distribution Statement : APPROVED FOR PUBLIC RELEASE