动态追踪算法在速调管输出段计算中的应用

在速调管的输出段中电子与输出腔电场相互作用向外界交出能量，电子速度出现很大的零散，采用传统的时间积分算法无法对超越粒子进行有效跟踪. 说明了动态追踪算法的原理，并将基于该方法编写的一维圆盘模型计算程序用于速调管输出段的分析，与传统算法相比取得了更加准确的数值结果. 关键词： 动态追踪算法 速调管 输出段

Application of dynamic track method in output-section calculation of klystrons

In the output section of klystrons, microwave energy is extracted from kinetic charged particles through beam_wave interaction process. In this region, the electron velocity will suffer violent changes, and some electrons may become so slow that they are overtaken by other ones. The traditional time integral method cannot track the laggard particles effectively, so its computation result is doubtful in the case of serious surpassing phenomenon existing in electron beam. To solve this problem, we present a new dynamic track method(DTM) that can correctly calculate the space charge force from other particles on the lagged ones. We will briefly explain DTM's principles and introduce a one_dimensional program based on this idea. Further, we apply this new program in output_section calculation of klystrons. The results show better agreement with experimental data than the traditional method.