分析了基于双级反射静电系统的电子脉冲压缩技术方法。类比于光子脉冲压缩用多层介质啁啾镜,将该静电系统称为可调谐静电啁啾镜: 根据静电啁啾镜电气结构参数的设置,入射电子脉冲在系统中U形反射运动飞行时间与其初始轴向能量具有相应不同的色散关系,也即正负啁啾特性。讨论了该啁啾镜正负啁啾属性的可调谐性及脉冲压缩技术细节,并给出了计算实例。

The generalized theory of double-stage electrostatic reflection system for time-domain compressing electron packet is presented. In analog to the multilayer dielectric optical chirp mirror for compressing optical pulse, the system is renamed as tunable electrostatic chirp mirror, of which the tunability of chirp properties is analyzed detailedly. The essential difference between the two chirp properties lies in the dispersive dependence of electron’s time of flight on its initial energy: the electrons with higher initial axial energy have longer time of flight for positive chirp, while it is not the case for negative chirp. The time of flight dispersive dependence constitutes the mechanism of electron packet compression for each mode. And an example illustration is given.