Acceleration of on-axis and ring-shaped electron beams in wakefields driven by Laguerre-Gaussian pulses

作者：Zhang, Guo-Bo; Chen, Min^*; Luo, Ji; Zeng, Ming; Yuan, Tao; Yu, Ji-Ye; Ma, Yan-Yun^*; Yu, Tong-Pu; Yu, Lu-Le; Weng, Su-Ming; Sheng, Zheng-Ming

来源：Journal of Applied Physics, 2016, 119(10): 103101.

DOI：10.1063/1.4943419

• LASER-WAKEFIELD

The acceleration of electron beams with multiple transverse structures in wakefields driven by Laguerre-Gaussian pulses has been studied through three-dimensional (3D) particle-in-cell simulations. Under different laser-plasma conditions, the wakefield shows different transverse structures. In general cases, the wakefield shows a donut-like structure and it accelerates the ring-shaped hollow electron beam. When a lower plasma density or a smaller laser spot size is used, besides the donut-like wakefield, a central bell-like wakefield can also be excited. The wake sets in the center of the donut-like wake. In this case, both a central on-axis electron beam and a ring-shaped electron beam are simultaneously accelerated. Further, reducing the plasma density or laser spot size leads to an on-axis electron beam acceleration only. The research is beneficial for some potential applications requiring special pulse beam structures, such as positron acceleration and collimation.

• 出版日期2016-3-14
• 单位中国人民解放军国防科学技术大学; 上海交通大学