1. Acceleration of on-axis and ring-shaped electron beams in wakefields driven by Laguerre-Gaussian pulses.
- Author
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Guo-Bo Zhang, Min Chen, Ji Luo, Ming Zeng, Tao Yuan, Ji-Ye Yu, Yan-Yun Ma, Tong-Pu Yu, Lu-Le Yu, Su-Ming Weng, and Zheng-Ming Sheng
- Subjects
ELECTRON beam research ,NUCLEAR particle research ,LASER beam measurement ,POSITRON beams ,COLLIMATION (Cinematography) - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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