相对论电子束在离子通道中的聚焦与输运

Propagation of relativistic electron beams in ion-focusing channel

基于单粒子理论,描述了相对论电子束在离子通道中的聚焦输运过程,讨论了离子-电子密度比、相对论因子、束加速电压和入射电流等系统参数对电子束的聚焦半径、纵向聚焦位置的影响。研究表明,离子通道对电子束具有强烈的聚焦效应,束流在离子通道内的传输是类周期波动传输,随传输距离增加,聚焦点处的半径逐渐增加,束流的波动幅度逐渐减小。选择适当的系统参数,可调节束聚焦点位置和聚焦点半径的大小,实现电子束的长距传输并且减少电子束的耗散。

The transmission characteristics of relativistic lizing the single-particle theory, and the effects of the system electron beams in the ion-focusing channel is given in this paper utiparameters such as the ion-electron density ratio, the beam voltage and the beam current density on the propagation and focusing of the beam are discussed. The relativistic electron beam can be strongly focused by the ion channel, and it exhibits wave-like transmission as it passes through the ion channel. The radius of the focal point will gradually rise and the amplitude of the beam wave will reduce as the beam transmits in the channel . The results show that efficient transmission of relativistic electron beams in the ion-focusing channel can be reached by choosing appropriate ion-electron density ratio, beam voltage and beam current density.