虚阴极振荡器中微波产生的解析理论
Analytical theory of microwave generation in vircator
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摘要: 用解析方法研究了虚阴极振荡器中微波产生的机理, 给出了小信号增益公式和饱和功率的标度。由此得到的结论是: 虚阴极振荡器的辐射一般情况下是由相位受到RF场调制的从虚阴极反射的电子束流产生的, 当注入电流稍大于第一临界电流时，有最高辐射增益区，但反射电流较小；当注入电流稍大于第二临界电流时，有较高辐射增益区，反射电流也较大。Abstract: In this paper, the mechanism of microwave generation in vircator is studied analytically, the formula of the small signal gain and the scaling law of the saturated power are given. The conclusion is that the coherent radiation in vircator is generated by the modulated electron current reflected from the virtual cathode. When the injection current is slightly larger than the first critical current, there is the highest radiation gain region, but the reflective current is smaller; when the injection current is slightly larger than the second critical current, there is a high radiation gain region, the reflective current is large too.
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