Optical control of transverse motion of ionization injected electrons in a laser plasma accelerator
Optical control of transverse motion of ionization injected electrons in a laser plasma accelerator
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激光等离子体加速器中电离注入电子横向运动的光学控制
DOI：
10.1017/hpl.2020.51
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发表时间：
2021-01
影响因子：
4.8
通讯作者：
Liming Chen
中科院分区：
文献类型：
--
作者：
Jie Feng;Yifei Li;Jinguang Wang;Dazhang Li;Changqing Zhu;Junhao Tan;Xiaotao Geng;Feng Liu;Liming Chen
摘要本文提出了一种利用横向不对称等离子体尾流场控制激光等离子体加速器中电离注入电子束横向运动的全光方法。激光聚焦形状可以控制横向尾流场的分布。实验中，当激光聚焦形状由圆形变为斜椭圆形时，电子束轮廓由椭圆形变为三种典型形状。三维细胞内粒子模拟结果与实验结果吻合较好，表明加速电子的运动轨迹由波浪形变为螺旋形。这种全光学方法可以方便地控制电子束的横向运动，从而产生轨道角动量的同步辐射。
Abstract We demonstrate an all-optical method for controlling the transverse motion of an ionization injected electron beam in a laser plasma accelerator by using the transversely asymmetrical plasma wakefield. The laser focus shape can control the distribution of a transversal wakefield. When the laser focus shape is changed from circular to slanted elliptical in the experiment, the electron beam profiles change from an ellipse to three typical shapes. The three-dimensional particle-in-cell simulation result agrees well with the experiment, and it shows that the trajectories of these accelerated electrons change from undulating to helical. Such an all-optical method could be useful for convenient control of the transverse motion of an electron beam, which results in synchrotron radiation from orbit angular momentum.