
Accession Number : AD0842733
Title : Characteristics of Magnetically Focused LargeSignal TravelingWave Amplifiers.
Descriptive Note : Final rept.,
Corporate Author : MICHIGAN UNIV ANN ARBOR ELECTRON PHYSICS LAB
Personal Author(s) : Detweiler, H. K.
Report Date : OCT 1968
Pagination or Media Count : 576
Abstract : This is an investigation of the performance of magnetically focused travelingwave amplifiers directed toward obtaining a better understanding of the physical phenomena involved in the interaction, and to determine what optimization measures can be employed. A generalized twodimensional nonlinear interaction theory is presented that describes the electronwave interaction process. A Lagrangian formulation is used in which the electron beam is modeled in terms of axisymmetric charge rings which are allowed to move both axially and radially in response to the rf circuit field, spacecharge field and static magnetic field. Green's function techniques are employed to evaluate the spacecharge field. Magnetic focusing fields which are periodic or tapered (increased) with distance along the device are considered in addition to the uniform magnetic field. The general interaction equations constitute a system of nonlinear integrodifferential equations which are valid for travelingwave amplifiers. The equations are systematically reduced by obtaining closedform solutions where possible, and introducing appropriate simplifying approximations. These solutions are presented and discussed for a variety of operating conditions. A travelingwave amplifier which employs a uniform magnetic focusing field was built in order to obtain some correlative experimental evidence. Excellent quantitative agreement was obtained with the predictions of the general theory. (Author)
Descriptors : *MICROWAVE AMPLIFIERS), (*TRAVELING WAVE TUBES, INTERACTIONS, ELECTRON BEAMS, MAGNETIC FIELDS, FOCUSING, SPACE CHARGE, ELECTROMAGNETIC RADIATION, EQUATIONS OF MOTION.
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE