Pulse-Width Increase of Reflex Triode Vircator Using the Carbon Fibre Cathode  

作　　者：刘列 李立民 张晓萍 文建春 万红 

机构地区：[1]College of Photoelectric Science and Engineering, National University of Defense Technology, Changsha 410073

出　　处：《Chinese Physics Letters》2006年第4期899-902,共4页中国物理快报（英文版）

摘　　要：We present the investigation on the reflex triode virtual cathode oscillator in which performances of carbonfibre and stainless-steel cathodes are compared with each other. The experimental results and analyses show that surface tracking induces the electron emission of the carbon fibre cathode. There are electron emission phenomena observed not only from the top of the carbon fibre but also from its side surface. Compared with the case of the stainless steel cathode, the plasma expansion velocity for the carbon fibre cathode is slower, and using the carbon fibre cathode can widen the pulse width of output microwave. The output microwave pulse width reaches an increase of about 20%. This mechanism ＆ different from the conventional explosive emission of metal cathodes.We present the investigation on the reflex triode virtual cathode oscillator in which performances of carbonfibre and stainless-steel cathodes are compared with each other. The experimental results and analyses show that surface tracking induces the electron emission of the carbon fibre cathode. There are electron emission phenomena observed not only from the top of the carbon fibre but also from its side surface. Compared with the case of the stainless steel cathode, the plasma expansion velocity for the carbon fibre cathode is slower, and using the carbon fibre cathode can widen the pulse width of output microwave. The output microwave pulse width reaches an increase of about 20%. This mechanism ＆ different from the conventional explosive emission of metal cathodes.

关 键 词：EMISSION 

分 类 号：O47[理学—半导体物理] TN32[理学—物理]