Accession Number : AD0842733

Title :   Characteristics of Magnetically Focused Large-Signal Traveling-Wave 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 traveling-wave 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 two-dimensional nonlinear interaction theory is presented that describes the electron-wave 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 r-f circuit field, space-charge field and static magnetic field. Green's function techniques are employed to evaluate the space-charge 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 integro-differential equations which are valid for traveling-wave amplifiers. The equations are systematically reduced by obtaining closed-form solutions where possible, and introducing appropriate simplifying approximations. These solutions are presented and discussed for a variety of operating conditions. A traveling-wave 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