
Accession Number : AD0615939
Title : INVESTIGATION OF LINEAR BEAM AND NEW CONCEPTS OF MICROWAVE POWER. VOLUME II. BEAMCIRCUIT ACTION.
Descriptive Note : Quarterly progress rept. no. 4, 1 Jul30 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 dc beam voltage at appropriate locations along the beam. Results are given in both small and largesignal analyses for two and threecavity klystrons with gridded and gridlessgap resonators. Analytical expressions of beamloading conductance for a transformed beam interacting with both gridded and gridlessgap resonators are derived. From smallsignal 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 beamcoupling coefficient, G is the beamloading conductance, and m sub b is ratio of transformed beam velocity to original beam velocity). This is valid in the largesignal domain, provided that M and G are ac voltage independent. The largesignal efficiency was found to be dependent on ac 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 ac 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