Characterization of Cesium Iodide-Coated Carbon-Fiber Aluminum Cathode for an S-Band High-Efficiency Vircator

被引：7
作者：
Ju, Jinchuan [1 ]
Cai, Dan [1 ]
Du, Guangxing [1 ]
Wang, Yuwei [1 ]
Liu, Lie [1 ]
Zhang, Jiande [1 ]
机构：
[1] Natl Univ Def Technol, Coll Optoelect Sci & Engn, Changsha 410073, Hunan, Peoples R China
来源：
IEEE TRANSACTIONS ON PLASMA SCIENCE | 2015年 / 43卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Carbon fiber; high-power microwave (HPM); plasma expansion; vircator; virtual cathode oscillator (VCO); TRIODE VIRTUAL CATHODE; OSCILLATOR; EMISSION; ENHANCEMENT; ANODE;
D O I：
10.1109/TPS.2015.2404135
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
Carbon-fiber-aluminum (CFA) cathode is characterized to generate high-power microwave (HPM) from a high-efficiency three-cavity virtual-cathode oscillator (vircator). Plasma expansion velocity associated with the cesium iodide (CsI)-coated CFA cathode is determined in the experiment. It is found that the stationary plasma expansion velocity is diminished by CsI-coating to about 3 cm/mu s when driving by a 300-kV electrical pulse. Particle-in-cell (PIC) simulations indicate that the proposed vircator is capable of generating 550-MW S-band HPM at a central frequency of 2.1 GHz, when the diode voltage and current are 420 kV and 9.2 kA, respectively. The corresponding power conversion efficiency is as high as 14%. The generated HPM is with the TE10 mode of rectangular waveguide, which can give rise to an on-axis radiation pattern without requiring mode converter.
引用
收藏
页码：3522 / 3526
页数：5
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