We demonstrate an all-optical method for controlling the transverse motion of ionization injected electron beam in laser plasma accelerator by utilizing the transversely asymmetrical plasma wakefield. The laser focus shape can control the distribution of transversal wakefield. When the laser focus shape is changed from the circular to the slantingly elliptic in experiment, the electron beam profiles change from ellipse and occur three typical shapes. The 3D-PIC simulation result agrees well with experiment, and it shows the trajectories of these accelerated electrons change from undulation to helix. Such an all-optical method could be useful for convenient control of the transverse motion of an electron beam, which results in synchrotron radiation with orbit angular momentum.
Feng Jie, Li Yifei, Wang Jingguang, Li Dazhang, Zhu Changqing, Tan JunHao, geng xiaotao, Liu Feng, Chen Liming. Optical control of transverse motion of ionization injected electrons in laser plasma accelerator[J]. High Power Laser Science and Engineering, , (): .
