Optical steering of electron beam in laser plasma accelerators
Changqing Zhu, Jinguang Wang, Yifei Li, J. Feng, Dazhang Li, Yuhang He, Junhao Tan, Jinglong Ma, Xin Lu, Yutong Li, Liming Chen
Abstract
Using a Dazzler system and tilting a compressor grating, we provide an effective way of using the laser group delay dispersion to continuously steer the electron beam accelerated by an asymmetric laser wakefield. The deviation angle of the electron beam was the same as that of the angularly chirped laser pulse from its initial optical axis, which is determined by the laser pulse-front-tilt (PFT). This method can be utilized to continuously control over the pointing direction of electron bunches to the requisite trajectories, especially for practical applications in highly sensitive alignment devices such as electron-positron colliders or undulators. Additionally, we investigate the effect of PFT on the properties of the electron beam.