新型双间隙虚阴极振荡器的理论分析和数值模拟

 该新型双间隙虚阴极振荡器的互作用区为一带孔金属薄膜隔开的两个圆柱形谐振腔；器件采用侧向提取同轴输出的方法，具有输出效率高和输出模式纯的优点；第一阳极薄膜采用了局部薄膜结构。对互作用腔进行冷腔分析，计算得到互作用腔Ⅰ和Ⅱ的品质因子分别为6 960和71.8，共振频率为2.3 GHz。当电子束电压为515 kV、电流为10 kA时，通过参数优化，模拟得到周期平均峰值功率大于570 MW、频率约2.4 GHz的微波输出，效率达到11%。模拟还发现电子束的最佳阻抗值约为51.5 W；电子束的输入功率在较大范围内变化时，器件的输出效率保持大于10%；在一定的范围内，器件的输出效率随电子束密度的增加而增加。对器件中由于电子能量沉积而引起的阳极膜的温升进行了估算，得到膜的最高温度为434 K，远低于熔点933 K。

A new double-gap vircator

A new double-gap vircator for high power microwave generation is proposed and studied by simulation in this paper. In the vircator, the interaction cavity is a cylindrical cavity separated into two resonators by a metal foil with a hole in the center. The vircator makes use of the side-extraction and coaxial output method. The quality factors of the cavity Ⅰ and Ⅱ are 6 960 and 71.8 respectively, the resonant frequency is 2.3 GHz. For an annular electron beam of 515 kV and 10 kA, by optimizing and using partial foil structures, the rms efficiency can reach 11% at an average output power of 570 MW at 2.4 GHz. Simulations show that the optimal impedance of the beam is about 51.5 W and the output efficiency increases with the increasing of beam current and keeps larger than 10% with the bea