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Electromagnetic mode analysis on the cold characteristics of photonic-band-gap resonant cavity loaded in gyrotron

Luo Yao-Tian Tang Chang-Jian Liu Chang Liu Pu-Kun

Electromagnetic mode analysis on the cold characteristics of photonic-band-gap resonant cavity loaded in gyrotron

Luo Yao-Tian, Tang Chang-Jian, Liu Chang, Liu Pu-Kun
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  • Received Date:  09 September 2008
  • Accepted Date:  22 January 2009
  • Published Online:  20 December 2009

Electromagnetic mode analysis on the cold characteristics of photonic-band-gap resonant cavity loaded in gyrotron

  • 1. (1)四川大学应用物理系,成都 610065; (2)四川大学应用物理系,成都 610065;解放军后勤工程学院基础部,重庆 400016; (3)中国科学院电子学研究所,北京 100080

Abstract: The traditional cylindrical resonant cavity loaded in gyrotron is substituted by the photonic-band-gap resonant cavity (PBGC) which is constructed by triangular arrays of metal posts, and the TE operating modes in PBGC are analyzed and calculated. Under the consideration of the cavity structure features, a research method for the mode theory on PBGC is provided. The single-mode operation in the cavity is found, and the distribution characteristics of the azimuthally inhomogeneous electromagnetic modes are reported. The research results show that the resonant frequency in the cavity can be excited without the limitation of transverse dimension. The study provides a physical theoretical fundamental of which reveals the possibility of changing the operating status of gyrotron essentially. This possibility will play an important role in the following aspects: enhancing the power capacity of cavity, carrying out the beam-wave interaction between high order electromagnetic single-mode and high electronics cyclotron harmonic wave efficiently, and reducing the gyrotron operating magnetic field.

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