Numerical study of 1.1 GeV electron acceleration over a-few-millimeter-long plasma with a tapered density

被引:23
作者
Hur, Min Sup [1 ]
Suk, Hyyong [2 ]
机构
[1] UNIST, Sch Elect & Comp Engn, Ulsan 689798, South Korea
[2] GIST, APRI, Kwangju 500712, South Korea
基金
新加坡国家研究基金会;
关键词
LASER; BEAMS; FIELD;
D O I
10.1063/1.3561781
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 present two-dimensional particle-in-cell simulations of laser wakefield electron acceleration up to 1.1 GeV over a-few-millimeter-long plasma with the help of density tapering. We observed that, in a uniform plasma, the electron beam reaches the dephasing state not only by the slow phase velocity of the wakefield but also by the relativistic prolonging of the plasma wavelength. Such a dephasing between the wakefield and beam can be mitigated by an upward density taper. By employing a parabolically increasing plasma density, we obtained a significant enhancement of the beam energy from 850 MeV (uniform) to 1.1 GeV (tapered). However, the similar relativistically promoted dephasing was observed again in the environment of tapered density. Over a few millimeters the driving laser pulse was well self-guided without any externally prepared channel. Thus, this parameter regime is suitable for the gas-jet laser wakefield electron acceleration experiments. (C) 2011 American Institute of Physics. [doi:10.1063/1.3561781]
引用
收藏
页数:6
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