多腔微波电子枪聚束腔作用分析

Function of bunching segment in multi-cell RF gun

分析了聚束腔中电场分布及电子的运动过程 ,使用 RUNGE-KUTTA法求出不同腔长时电子的俘获相位及不同初始相位电子的运动轨迹 ,讨论了加聚束段对减小电子反轰的作用。研制的 4+1 /2腔 RF-gun使用首腔和第二加速腔作为聚束段 ,取得了高占空因子 。

With a bunching segment and a shortened first cell, the 4+1/2 cell RF gun has been proved experimentally to be effective in reducing electron back bombardment. The analysis of the electric field distribution and electron motion in bunching segment of multi-cell RF gun is presented. The electron capture efficiency and electron trajectory with different initial phase are calculated using Runge-Kutta method. The function of the bunching segment is discussed. The calculated parameters of the 4+1/2 cell RF gun agree well with the experimental results.