Application of carbon/carbon composite cathode in relativistic klystron amplifier
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摘要: 研制了一种碳纤维分布具有高取向性的碳碳复合材料, 并采用该材料制作的阴极开展了相对论速调管放大器的实验研究。实验结果表明：碳碳复合阴极爆炸发射的点火机制以尖端场增强为主, 运行1000发后碳纤维结构稳定, 重复频率25 Hz运行时输出微波功率大于1 GW, 脉冲宽度大于100 ns, 阴极发射电流密度约3.82 kA/cm2。碳碳复合阴极在启动速度、电流延迟时间及阻抗特性等方面性能还有待进一步的研究。Abstract: A novel carbon/carbon composite cathode with carbon fibers perpendicular to the surface is developed and used in the relativistic klystron amplifier(RKA). The experimental results show that the field enhanced on the whisker is the main ignition of the explosive emission. RKA can steadily run at the frequency of 25 Hz with an output microwave power more than 1 GW, a pulse duration beyond 100 ns and a current density of 3.82 kA/cm2. The parameters of the carbon/carbon composite cathode such as start-up speed, current delay time and impedance characteristic still need to be studied in the future.
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