双间隙耦合腔电子电导的理论与计算仿真

在速调管双间隙耦合谐振腔中,电子与每个间隙的电场相互作用进行能量交换,在两个间隙上体现出不同的电子负载效应.传统的电子电导计算模型,只能从整体上而无法在每个间隙上考虑这个效应.基于空间电荷波理论,建立了双间隙耦合腔中单个间隙电子电导的理论模型,推导出相应的计算公式.利用三维粒子模拟工具进行了仿真研究,理论计算与仿真结果相符.与传统的电子电导模型相比,该理论模型能反映出双间隙耦合腔中每个间隙的电子负载效应.利用该模型能更加深入和准确地进行间隙注波互作用的研究以及耦合腔中模式稳定性的分析. 关键词： 双间隙耦合腔 空间电荷波理论 电子电导 粒子模拟

The theory and computer simulation of beam-loading conductance in the double-gap coupled cavity

In a double-gap coupled cavity of klystrons, the electrons exchange energy with the electric field in each gap through beam-wave interaction process, and different beam-loading effects take place in each gap. However in this case the traditional beam-loading model does not hold true. To solve this problem, we present a novel model according to the space-charge-wave theory to calculate the beam-loading conductance in each gap of the coupled-cavity, and also derive the formulations. Moreover, we perform a simulation study using a three-dimensional particle-in-cell code. The results obtained by the model show good agreement with the simulation results. In comparison with the traditional model, the new model can be used to calculate the beam-loading conductances in diffident regions of the coupled-cavity, and then it can be used to study the beam-wave interactions in the gaps and analyze the mode stability in the coupled-cavity in a high accuracy.