A simulated annealing algorithm for optimizing RF power efficiency in coupled-cavity traveling-wave tubes

Author

Wilson, Jeffrey D.

Author_Institution

NASA Lewis Res. Center, Cleveland, OH, USA

Volume

44

Issue

12

fYear

1997

fDate

12/1/1997 12:00:00 AM

Firstpage

2295

Lastpage

2299

Abstract

Decreasing the radio frequency (RF) phase velocity in the output section of a traveling-wave tube (TWT) is a technique commonly used to increase RF power efficiency. In order to optimize the profile of the phase velocity, a simulated annealing algorithm has been developed and implemented into the NASA multidimensional large-signal coupled-cavity TWT computer model. This algorithm allows the determination of the lengths of the individual cavities at the end of the output section necessary to provide the optimized phase velocity profile. The resulting nonlinear computer-generated phase velocity profile provides a design with optimized RF efficiency. In this paper, the optimization algorithm is described and computational results are shown. These results indicate an increase in center-frequency RF efficiency from 7.1 to 13.5% for a V-band coupled-cavity TWT

Keywords

cavity resonators; computer aided analysis; electrical engineering computing; millimetre wave tubes; simulated annealing; travelling wave tubes; velocity; NASA TWT computer model; RF phase velocity profile; RF power efficiency optimisation; V-band TWT; cavity length determination; coupled-cavity TWT; coupled-cavity computer model; multidimensional large-signal model; nonlinear computer-generated velocity profile; optimization algorithm; simulated annealing algorithm; traveling-wave tubes; Circuit simulation; Coupling circuits; Design optimization; Electron beams; Input variables; Multidimensional systems; NASA; Radio frequency; Simulated annealing; Solids;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/16.644656

Filename

644656