Efficiency and stability enhancement of a virtual cathode oscillator  

作　　者：樊玉伟 李志强 舒挺 刘静 

机构地区：[1]College of Optoelectric Science and Engineering,National University of Defense Technology

出　　处：《Chinese Physics B》2014年第7期541-544,共4页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11075210);the Postdoctoral Science Foundation of China(GrantNo.201104761)

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 com- posed 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 fre- quency 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%.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 com- posed 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 fre- quency 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 

分 类 号：TN752[电子电信—电路与系统]