Open AccessResearch on the mode competition in a w-band lossy ceramic-loaded gyrotron backward-wave oscillator
Author(s) -
Cheng Du,
Zheng-Di Li,
Xue Zhi-Hao,
Pu-Kun Liu,
Xue Qianzhong,
Shichang Zhang,
Shou-Xi Xu,
Zhi-Hui Geng,
Wanyi Gu,
Yeu Su,
Gaofeng Liu
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.070703
Subject(s) - gyrotron , backward wave oscillator , physics , broadband , bandwidth (computing) , lossy compression , extremely high frequency , wideband , oscillation (cell signaling) , optics , acoustics , power (physics) , electrical engineering , electron , cathode ray , telecommunications , computer science , engineering , quantum mechanics , artificial intelligence , biology , genetics
Mode competition induces non-stationary oscillations during the operation of a gyrotron backward-wave oscillator (gyro-BWO), which severely reduces its tunable bandwidth and output power. Self-consistent nonlinear theory is used to study the modes-competition mechanism of a W-band fundamental TE01 mode gyro-BWO. Tapered non-resonant interaction circuit structure and loading lossy ceramic are employed to suppress the competing modes, as a way of preventing non-stationary oscillation in the circuit. Systematically optimized interaction circuit is capable of suppressing all the competing modes and can stably operate in the fundamental axial mode of the TE01 mode. Calculation indicates that a peak power of 105 kW and a -3 dB tunable bandwidth of 5.4% are attainable. This is meaningful and provides a theoretical foundation for developing broadband millimeter gyro-BWOs in the applications of counter-measure system, non-destructive detection, plasma diagnosis, material processing, and so on.