Computationally generated velocity taper for efficiency enhancement in a coupled-cavity traveling-wave tube

Author

Wilson, Jeffrey D.

Author_Institution

NASA Lewis Res. Center, Cleveland, OH, USA

Volume

36

Issue

4

fYear

1989

fDate

4/1/1989 12:00:00 AM

Firstpage

811

Lastpage

816

Abstract

A computational routine has been created to generate velocity tapers for efficiency enhancement in coupled-cavity traveling-wave tubes (TWTs). Programmed into the NASA multidimensional large-signal coupled-cavity TWT computer code, the routine generates the gradually decreasing cavity periods required to maintain a prescribed relationship between the circuit phase velocity and the electron-bunch velocity. Computational results for several computer-generated tapers are compared to those for an existing coupled-cavity TWT with a three-step taper. Guidelines are developed for prescribing the bunch-phase profile to produce a taper for high efficiency. The resulting taper provides a calculated RF efficiency 45% higher than the step taper at center frequency and at least 37% higher over the bandwidth

Keywords

electron beams; electronic engineering computing; travelling-wave-tubes; NASA; TWTs; bunch-phase profile; circuit phase velocity; computational routine; computer code; coupled-cavity; efficiency enhancement; electron-bunch velocity; high efficiency; microwave tubes; multidimensional large-signal; traveling-wave tube; velocity taper; Acceleration; Bandwidth; Closed-form solution; Coupling circuits; Electron tubes; Guidelines; High performance computing; Multidimensional systems; NASA; Radio frequency;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/16.22491

Filename

22491