多级降压收集极CAD中的二次电子发射模型

多级降压收集极被广泛应用于提高微波放大器件效率.多级降压收集极中的二次电子发射对其效率有重要影响.该文探讨了真二次电子、弹性反射电子、非弹性反射电子3种二次电子发射模型,对发射率、发射角度以及能量分布情况进行了深入分析,并对考虑二次电子后的收集极模拟计算收敛条件进行了讨论.上述结果在多级降压收集极CAD软件中得到应用,定量分析了其对多级降压收集极效率的影响.

The Emission Model of Secondary Electron in Multistage Depressed Collector CAD

The Multistage Depressed Collector (MDC) is widely used to improve the efficiency of microwave amplifiers. The emission of secondary electron in MDC has important influence on the efficiency. In this paper, the emission models of true secondary electron, elastic and inelastic reflected electron are discussed, and the corresponding emission ratio, angle and energy distribution are deeply analyzed. Moreover, the convergence criteria in MDC simulation is discussed, when the secondary electron are considered. The results of the analysis and discussion are used in the CAD software about MDC design, and the effects of secondary electron on the efficiency of MDC are quantitatively analyzed.