中国物理B ›› 2008, Vol. 17 ›› Issue (7): 2484-2490.doi: 10.1088/1674-1056/17/7/023

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Theoretical research on the performance of a practical helix travelling wave tube

段兆云1, 宫玉彬2, 魏彦玉2, 王文祥2   

  1. (1)Vacuum Electronics National Laboratory, College of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China; (2)Vacuum Electronics National Laboratory, College of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
  • 收稿日期:2007-03-26 修回日期:2008-03-06 出版日期:2008-07-09 发布日期:2008-07-09
  • 基金资助:
    Projects partially supported by the National Natural Science Foundation of China (Grant Nos 60601007 and 60532010), and the Youth Science and Technology Foundation of University of Electronic Science and Technology of China (Grant No JX05018).

Theoretical research on the performance of a practical helix travelling wave tube

Duan Zhao-Yun(段兆云)†, Gong Yu-Bin(宫玉彬),Wei Yan-Yu(魏彦玉), and Wang Wen-Xiang(王文祥)   

  1. Vacuum Electronics National Laboratory, College of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
  • Received:2007-03-26 Revised:2008-03-06 Online:2008-07-09 Published:2008-07-09
  • Supported by:
    Projects partially supported by the National Natural Science Foundation of China (Grant Nos 60601007 and 60532010), and the Youth Science and Technology Foundation of University of Electronic Science and Technology of China (Grant No JX05018).

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摘要： On the basis of a rigorous field theory, two different physical models of attenuator and sever have been proposed. One is named High attenuation (HATT) model in which both attenuator and sever are considered as a unified attenuator, but the sever is regarded as an area of very high loss; the other is called Sever and attenuator (SATT) model in which the sever is modelled as a drift area in which the electric and magnetic fields both vanish. A complex function is derived and potential sinking effect is also considered. Thus, a set of more practical self-consistent equations of nonlinear beam--wave interaction is formulated. Simulations are carried out under the conditions of the two different physical models, and the simulation results are compared with the experimental data. The results show that in the case of single signal drive, the unknown second harmonic should be included for predicting the saturated output power. It is also evident that the SATT model and the HATT model predict the same physical nature, whereas the results predicted by the HATT model are much closer to the experimental data than those obtained from the SATT model. Therefore, these results provide a strong theoretical basis for designing broadband and high gain helix travelling wave tubes.

关键词: helix, travelling wave tube, field theory, nonlinear beam--wave interaction

Abstract: On the basis of a rigorous field theory, two different physical models of attenuator and sever have been proposed. One is named High attenuation (HATT) model in which both attenuator and sever are considered as a unified attenuator, but the sever is regarded as an area of very high loss; the other is called Sever and attenuator (SATT) model in which the sever is modelled as a drift area in which the electric and magnetic fields both vanish. A complex function is derived and potential sinking effect is also considered. Thus, a set of more practical self-consistent equations of nonlinear beam--wave interaction is formulated. Simulations are carried out under the conditions of the two different physical models, and the simulation results are compared with the experimental data. The results show that in the case of single signal drive, the unknown second harmonic should be included for predicting the saturated output power. It is also evident that the SATT model and the HATT model predict the same physical nature, whereas the results predicted by the HATT model are much closer to the experimental data than those obtained from the SATT model. Therefore, these results provide a strong theoretical basis for designing broadband and high gain helix travelling wave tubes.

Key words: helix, travelling wave tube, field theory, nonlinear beam--wave interaction

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

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