Experimental signatures of direct-laser-acceleration-assisted laser wakefield acceleration

Experimental signatures of direct-laser-acceleration-assisted laser wakefield acceleration
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直接激光加速辅助激光尾场加速的实验特征

DOI:
10.1088/1361-6587/aaade1
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发表时间:
2018
影响因子:
2.2
通讯作者:
Joshi, C
Joshi, C
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shaw, J L;Lemos, N;Marsh, K A;Froula, D H;Joshi, C

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通过实验和模拟研究了激光尾波场加速器(LWFA)中电子的直接激光加速(DLA)。当在LWFA腔中捕获的电子和驱动激光之间存在显著重叠时,所产生的电子可以从LWFA和DLA机制中获得能量。实验研究了电离注入LWFA中产生的电子束在垂直于激光偏振方向上的色散特性。这些电子束显示出DLA特有的某些光谱特征。这些特征特征是使用粒子在细胞模拟再现,其中粒子跟踪被用来阐明在本实验体系中LWFA和DLA对电子能量增益的作用,并证明这些光谱特征是DLA在LWFA中存在的确切信号。
The direct laser acceleration (DLA) of electrons in a laser wakefield accelerator (LWFA) operating in the forced or quasi-blowout regimes has been investigated through experiment and simulation. When there is a significant overlap between the trapped electrons and the drive laser in a LWFA cavity, the resulting electrons can gain energy from both the LWFA and the DLA mechanisms. Experimental work investigates the properties of the electron beams produced in a LWFA with ionization injection by dispersing those beams in the direction perpendicular to the laser polarization. These electron beams show certain spectral features that are characteristic of DLA. These characteristic features are reproduced using particle-in-cell simulations, where particle tracking was used to elucidate the roles of LWFA and DLA to the energy gain of the electrons in this experimental regime and to demonstrate that such spectral features are definitive signatures of the presence of DLA in LWFA.
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发表时间: 2016-02
影响因子: 2.2
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