›› 2014, Vol. 23 ›› Issue (7): 75208-075208.doi: 10.1088/1674-1056/23/7/075208

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Efficiency and stability enhancement of a virtual cathode oscillator

樊玉伟, 李志强, 舒挺, 刘静   

  1. College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • 收稿日期:2013-07-28 修回日期:2013-12-31 出版日期:2014-07-15 发布日期:2014-07-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11075210) and the Postdoctoral Science Foundation of China (Grant No. 201104761).

Efficiency and stability enhancement of a virtual cathode oscillator

Fan Yu-Wei (樊玉伟), Li Zhi-Qiang (李志强), Shu Ting (舒挺), Liu Jing (刘静)   

  1. College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • Received:2013-07-28 Revised:2013-12-31 Online:2014-07-15 Published:2014-07-15
  • Contact: Fan Yu-Wei E-mail:Fyw9108212@126.com
  • About author:52.59.-f; 52.65.Rr; 52.27.Ny
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11075210) and the Postdoctoral Science Foundation of China (Grant No. 201104761).

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摘要： A virtual cathode oscillator (VCO) with a resonant cavity is presented and investigated numerically and theoretically, and its efficiency and stability are enhanced. An equivalent circuit method is introduced to analyze the resonant cavity composed of anode foil and feedback annulus, and a theoretical expression for the fundamental mode frequency of the resonant cavity is given. The VCO is investigated in detail with a particle-in-cell method. We obtain the microwave frequencies from simulation, theoretical expression, and relative references, and draw three important conclusions. First, the microwave frequency is a constant when the diode voltage is changed from 588 kV to 717 kV. Second, the fluctuation of the microwave frequency is very small when the AK gap is changed from 1.2 cm to 1.6 cm. Third, the microwave frequency agrees with the theoretical result. The relative error, which is calculated according to the theoretical and simulation frequencies, is only 1.7%.

关键词: virtual cathode oscillator (VCO), equivalent circuit method, particle-in-cell method

Abstract: A virtual cathode oscillator (VCO) with a resonant cavity is presented and investigated numerically and theoretically, and its efficiency and stability are enhanced. An equivalent circuit method is introduced to analyze the resonant cavity composed of anode foil and feedback annulus, and a theoretical expression for the fundamental mode frequency of the resonant cavity is given. The VCO is investigated in detail with a particle-in-cell method. We obtain the microwave frequencies from simulation, theoretical expression, and relative references, and draw three important conclusions. First, the microwave frequency is a constant when the diode voltage is changed from 588 kV to 717 kV. Second, the fluctuation of the microwave frequency is very small when the AK gap is changed from 1.2 cm to 1.6 cm. Third, the microwave frequency agrees with the theoretical result. The relative error, which is calculated according to the theoretical and simulation frequencies, is only 1.7%.

Key words: virtual cathode oscillator (VCO), equivalent circuit method, particle-in-cell method

中图分类号:  (Intense particle beams and radiation sources)

  • 52.59.-f
52.65.Rr (Particle-in-cell method) 52.27.Ny (Relativistic plasmas)