【摘要】 提出了虚阴极振荡器（Ｖｉｒｃａｔｏｒ）一种新的物理模型，用自己编写的两维半、全电磁、相对论性的粒子模拟程序ＷＧＣＦ模拟了两个对称虚阴极互相耦合振荡产生高功率微波（ＨＰＭ）的物理过程，激发的柱面波横向３６０°引出。通过大量的计算（包括单束情况）表明：（１）极距ｄ不变时，无论双束还是单束，比值Ｊ＿０／Ｊ＿ｃ在１２～２之间效率较高；（２）Ｊ＿０／Ｊ＿ｃ不变时，极距ｄ有一最佳值，大于或小于此值时效率略降低；（３）双束情况输出波型较纯净，无“直流”分量，单束情况却不然；（４）双束时频率增宽；（５）与一维情况不同，Ｊ＿０≈Ｊ＿ｃ时也会发生振荡，但直流成分较大。此外，我们对横向外边界的透射边界条件和辐射功率按模式、频率分布的表达式进行了推导。更多还原

【Abstract】 In the paper,a dual beam side shot virtual cathode oscillator（SSVCO） model has beenestablished and simulated by a 2.5-dimensional,fully electromagnetic, relativistic CIC particlesimulation code WGCF。The simulations （including single beam case）indicate:（1）the maximum averageefficiency occurs for a fixed distance of the two anodes when the injected beam current J₀ is 1.2～2times as large as the critical current J_c;（2）there is an optimum distance where the maximum efficiencyis reached for a given ratio of J₀/J_c;（3）as compared with single beam case,the microwave modesare purer,no direct current fields are coupled to output window and the central frequencyexpands wider,（4）oscillations still exist for J₀～J_c,but d.c. fields are dominant.Besides,thepower distribution functions with modes or frequencies and a new absorbing boundary condition have been derived.更多还原