中国物理B ›› 2011, Vol. 20 ›› Issue (7): 78401-078401.doi: 10.1088/1674-1056/20/7/078401

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Nonlinear time-dependent simulation of helix traveling wave tubes

彭维峰, 杨中海, 胡玉禄, 李建清, 陆麒如, 李斌   

  1. Vacuum Electronics National Laboratory, University of Electronic Science and Technology of China, Chengdu 610054, China
  • 收稿日期:2010-10-13 修回日期:2011-01-17 出版日期:2011-07-15 发布日期:2011-07-15

Nonlinear time-dependent simulation of helix traveling wave tubes

Peng Wei-Feng(彭维峰), Yang Zhong-Hai(杨中海), Hu Yu-Lu(胡玉禄), Li Jian-Qing(李建清), Lu Qi-Ru(陆麒如), and Li Bin(李斌)†   

  1. Vacuum Electronics National Laboratory, University of Electronic Science and Technology of China, Chengdu 610054, China
  • Received:2010-10-13 Revised:2011-01-17 Online:2011-07-15 Published:2011-07-15

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摘要： A one-dimensional nonlinear time-dependent theory for helix traveling wave tubes is studied. A generalized electromagnetic field is applied to the expression of the radio frequency field. To simulate the variations of the high frequency structure, such as the pitch taper and the effect of harmonics, the spatial average over a wavelength is substituted by a time average over a wave period in the equation of the radio frequency field. Under this assumption, the space charge field of the electron beam can be treated by a space charge wave model along with the space charge coefficient. The effects of the radio frequency and the space charge fields on the electrons are presented by the equations of the electron energy and the electron phase. The time-dependent simulation is compared with the frequency-domain simulation for a helix TWT, which validates the availability of this theory.

Abstract: A one-dimensional nonlinear time-dependent theory for helix traveling wave tubes is studied. A generalized electromagnetic field is applied to the expression of the radio frequency field. To simulate the variations of the high frequency structure, such as the pitch taper and the effect of harmonics, the spatial average over a wavelength is substituted by a time average over a wave period in the equation of the radio frequency field. Under this assumption, the space charge field of the electron beam can be treated by a space charge wave model along with the space charge coefficient. The effects of the radio frequency and the space charge fields on the electrons are presented by the equations of the electron energy and the electron phase. The time-dependent simulation is compared with the frequency-domain simulation for a helix TWT, which validates the availability of this theory.

Key words: helix traveling wave tubes, time-dependent, harmonics, helix pitch taper

中图分类号:  (Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.))

  • 84.40.Fe
13.40.Ks (Electromagnetic corrections to strong- and weak-interaction processes)