碳纤维阴极对输出脉宽及能量的影响
Effect of carbon-fiber cathode on output pulse width and energy
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摘要: 在反射三极管实验平台上，通过浸渍碘化铯(CsI)碳纤维阴极与不锈钢阴极实验对比，研究了碳纤维阴极对虚阴极振荡器输出微波脉宽及能量的影响。实验得出碳纤维阴极虚阴极振荡器输出微波脉宽约200 ns，较不锈钢阴极虚阴极振荡器增加了30%；对输出微波脉宽面积近似积分，得出碳纤维阴极虚阴极振荡器与不锈钢阴极虚阴极振荡器的输出微波脉宽面积比值约为2.273，表明碳纤维阴极虚阴极振荡器输出微波能量是不锈钢阴极虚阴极振荡器的2倍左右。分析认为碳纤维阴极的材料特性及其综合发射机制导致阴阳极间等离子体膨胀速度及温度降低，延缓了阴阳极间隙的闭合，从而增加了输出微波脉宽，提高了微波输出能量。Abstract: The carbon-fiber cathode with CsI was substituted for the stainless steel cathode in the reflex triode virtual cathode oscillator experimental device. The carbon-fiber cathode vircator output microwaves with pulse width over 200 ns, which was about 30% longer than that of stainless steel cathode, and the ratio of the pulse areas was about 2.273, which meant the energy of single pulse of the former was double the latter’s. It was analysed that the complex emission mechanism, characteristic and configuration of the carbon fiber cathode slowers the plasma expansion velocities and lowers the temperature, thus extends the output pulse width and enhances the output energy.
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