Liu Lie, Li Limin, Zhang Jun, Zhang Xiaoping, Wen Jianchun, Liu Yonggui
College of Photoelectric Science and Engineering, National University of Defense Technology, Changsha, PR China.
Rev Sci Instrum. 2008 Jun;79(6):064701. doi: 10.1063/1.2936870.
We report the fabrication technique of tufted carbon fiber cathodes for different microwave sources. Three carbon fiber cathodes were constructed, including a planar cathode, an annular cathode, and a cylindrical cathode for radial emission. Experimental investigations on these cathodes were performed in a reflex triode virtual cathode oscillator (vircator), a backward wave oscillator (BWO), and a magnetically insulated transmission line oscillator (MILO), respectively. The pulse duration of microwave emission from the reflex triode vircator was lengthened by using the planar carbon fiber cathode. In the BWO with the annular carbon fiber cathode, the uniform electron beam with a kA/cm(2) current density was observed. In addition, carbon fiber has great promise as field emitter for MILOs. These results show that the carbon fiber cathodes can be utilized for electron emission in high power diodes with different structures.
我们报告了用于不同微波源的簇状碳纤维阴极的制造技术。构建了三种碳纤维阴极，包括平面阴极、环形阴极和用于径向发射的圆柱形阴极。分别在反射三极管虚阴极振荡器（vircator）、返波振荡器（BWO）和磁绝缘传输线振荡器（MILO）中对这些阴极进行了实验研究。使用平面碳纤维阴极延长了反射三极管vircator发出微波的脉冲持续时间。在具有环形碳纤维阴极的BWO中，观察到了电流密度为kA/cm²的均匀电子束。此外，碳纤维作为MILO的场发射体具有很大的潜力。这些结果表明，碳纤维阴极可用于不同结构的高功率二极管中的电子发射。
