Large-charge quasimonoenergetic electron beams produced by off-axis colliding laser pulses in underdense plasma
| Autor: | Yuchi Wu, Yunjun Gu, Kegong Dong, S. K. He, Wei Hong, Deng Zhigang, Zhang Beizhen, Bin Zhu, Teng Jian, Zhimeng Zhang |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Physical Review E. 95 |
| ISSN: | 2470-0053 2470-0045 |
| Popis: | Electrons can be efficiently injected into a plasma wave by colliding two counterpropagating laser pulses in a laser wakefield acceleration. However, the generation of a high-quality electron beam with a large charge is difficult in the traditional on-axis colliding scheme due to the growth of the electron beam duration coming from the increase of the beam charge. To solve this problem, we propose an off-axis colliding scheme, in which the collision point is away from the axis of the driver pulse. We show that the electrons injected from the off-axis region are highly concentered on the tail of the bubble even for a large trapped charge, thus feeling almost the same accelerating field. As a result, quasimonoenergetic electron beams with a large charge can be produced. The validity of this scheme is confirmed by both the particle-in-cell simulations and the Hamiltonian model. Furthermore, it is shown that a Laguerre-Gauss (LG) laser can be adopted as the injection pulse to realize the off-axis colliding injection in three dimensions symmetrically, which may be useful in simplifying the technical layout of the real experiment setup. |
| Databáze: | OpenAIRE |
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