强激光与粒子束, 2018, 30 (11): 111003, 网络出版: 2019-01-18  

基于紧聚焦超高斯激光脉冲的大电量低发散度电子束产生

Generation of high-quality electron beams based on tightly focused super-Gaussian laser
作者单位
中国工程物理研究院 激光聚变研究中心, 四川 绵阳 621900
摘要
在激光尾场加速中, 光学注入是一种有效的可控电子注入机制。然而, 低电量、大发散度的电子束特性无法满足实际应用的需要。为获得大电量、高品质电子束提出采用紧聚焦的超高斯激光作为注入脉冲的新型注入方案。研究发现, 相比于普通高斯激光, 紧聚焦的超高斯激光不仅能够将电子束发散度降低近一个数量级, 而且能够保持电子束电荷量不变。通过哈密顿理论模型证实, 离轴电子是发散度的主要来源, 而紧聚焦的超高斯激光极大地限制了离轴电子的注入, 因此有效地降低了电子束的发散度。
Abstract
Electron optical injection is an efficient all-optical injection scheme in laser wakefield accelerations. However, low-charge and large emittance electron beam is still not suitable for many practical applications. This paper presents a novel injection scheme by colliding a tightly focused super-Gaussian laser with a Gaussian pump laser. It is found that the emittance of electron beam becomes almost an order of magnitude lower than that of all-Gaussian case, while the charge of electron bunch is conserved. It is also found that the electron emittance is mainly attributed to off-axis injected electrons by a Hamiltonian model. This unique ability will pave the way towards the generation of high-quality electron beams and extend the applications of laser-plasma accelerators.

邓志刚, 贺书凯, 崔波, 滕建, 张智猛. 基于紧聚焦超高斯激光脉冲的大电量低发散度电子束产生[J]. 强激光与粒子束, 2018, 30(11): 111003. Deng Zhigang, He Shukai, Cui Bo, Teng Jian, Zhang Zhimeng. Generation of high-quality electron beams based on tightly focused super-Gaussian laser[J]. High Power Laser and Particle Beams, 2018, 30(11): 111003.

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