A 3-D Large Signal Model for Sheet Beam Traveling Wave Tubes

Author

Wenqiu Xie ; Zi-Cheng Wang ; Jirun Luo ; Ding Zhao

Author_Institution

Inst. of Electron., Beijing, China

Volume

62

Issue

3

fYear

2015

fDate

Mar-15

Firstpage

1010

Lastpage

1016

Abstract

A 3-D frequency domain large signal code called sheet beam traveling-wave tube 3-D (SBTWT3-D) for illustrating the nonlinear beam-wave interaction in the SBTWT is presented in this paper. A recent published field theory model for illustrating the staggered double-grating arrays waveguide (SDGAW) slow-wave structure is adopted in the code to obtain the RF circuit fields´ distribution and ohmic loss. The sheet beam is simulated by a set of discrete rays. The ac and dc space-charge fields are obtained by solving the discrete Helmholtz equations and the discrete Poisson equation, respectively. A 3-D nonlinear beam-wave interaction analysis for a W-band SDGAW SBTWT is performed and the calculation results are compared with those obtained from time-domain 3-D particle-in-cell simulations.

Keywords

Helmholtz equations; Poisson equation; frequency-domain analysis; slow wave structures; 3D frequency domain large signal code; RF circuit field distribution; W-band SDGAW SBTWT; ac space-charge fields; dc space-charge fields; discrete Helmholtz equations; discrete Poisson equation; discrete rays; field theory model; nonlinear beam-wave interaction analysis; ohmic loss; sheet beam traveling wave tubes; slow-wave structure; staggered double-grating arrays waveguide; time-domain particle-in-cell simulations; Electron tubes; Equations; Harmonic analysis; Integrated circuit modeling; Mathematical model; Radio frequency; Solid modeling; 3-D; nonlinear model; sheet beam (SB); traveling-wave tubes (TWTs); traveling-wave tubes (TWTs).;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2014.2386903

Filename

7008437