Thumbnail
Access Restriction
Open

Author Fu, Chengfang ♦ Zhao, Bo ♦ Yang, Yudong ♦ Ju, Yongfeng ♦ Wei, Yanyu
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ AMPLITUDES ♦ BEAMS ♦ CARTESIAN COORDINATES ♦ CROSS SECTIONS ♦ EFFICIENCY ♦ ELECTRONS ♦ EQUIVALENT CIRCUITS ♦ GAIN ♦ GREEN FUNCTION ♦ LENGTH ♦ LORENTZ FORCE ♦ NONLINEAR PROBLEMS ♦ ONE-DIMENSIONAL CALCULATIONS ♦ PARTIAL DIFFERENTIAL EQUATIONS ♦ SPACE CHARGE ♦ TRAVELLING WAVE TUBES ♦ TRAVELLING WAVES
Abstract A 1-D nonlinear theory of a rectangular helix traveling-wave tube (TWT) interacting with a ribbon beam is presented in this paper. The RF field is modeled by a transmission line equivalent circuit, the ribbon beam is divided into a sequence of thin rectangular electron discs with the same cross section as the beam, and the charges are assumed to be uniformly distributed over these discs. Then a method of computing the space-charge field by solving Green's Function in the Cartesian Coordinate-system is fully described. Nonlinear partial differential equations for field amplitudes and Lorentz force equations for particles are solved numerically using the fourth-order Runge-Kutta technique. The tube's gain, output power, and efficiency of the above TWT are computed. The results show that increasing the cross section of the ribbon beam will improve a rectangular helix TWT's efficiency and reduce the saturated length.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-08-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 23
Issue Number 8


Open content in new tab

   Open content in new tab