Effects of self-focusing on tunnel-ionization-induced injection in a laser wakefield accelerator

被引：16

作者：

Xia, Changquan ^{[1
]}

Liu, Jiansheng ^{[1
]}

Wang, Wentao ^{[1
]}

Lu, Haiyang ^{[1
]}

Cheng, Wang ^{[1
]}

Deng, Aihua ^{[1
]}

Li, Wentao ^{[1
]}

Zhang, Hui ^{[1
]}

Liang, Xiaoyan ^{[1
]}

Leng, Yuxin ^{[1
]}

Lu, Xiaoming ^{[1
]}

Wang, Cheng ^{[1
]}

Wang, Jianzhou ^{[1
]}

Nakajima, Kazuhisa ^{[1
,2
]}

Li, Ruxin ^{[1
]}

Xu, Zhizhan ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China

[2] High Energy Accelerator Org, Tsukuba, Ibaraki 3050801, Japan

来源：

PHYSICS OF PLASMAS | 2011年 / 18卷 / 11期

关键词：

gas mixtures; helium; ionisation; oxygen; plasma accelerators; plasma density; plasma light propagation; plasma transport processes; self-focusing; wakefield accelerators; ELECTRON-BEAMS; WAKE; WAVE; PULSES;

D O I：

10.1063/1.3656958

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We report on the study of the self-focusing effects on the tunnel-ionization-induced injection in a laser wakefield accelerator. Targets composed of a gas mixture of 94% helium and 6% oxygen were used. The energy, energy spread, and charge of the generated electron beams can be adjusted by changing the input laser intensity and the plasma density, but the different aspects of the properties of the electron beams were not independent. It was inferred that the K-shell electrons of oxygen were ionized and injected into the plasma wake for acceleration when the laser intensity was increased beyond the threshold for generating O7+ by tunnel-ionization, due to the relativistic self-focusing in the propagation. Controlling the self-focusing of the laser beam by adjusting the input laser energy to shorten the distance over which the electrons were injected into the wake, quasi-monoenergetic electron beams were observed. (C) 2011 American Institute of Physics. [doi:10.1063/1.3656958]

引用

页数：6

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