Electron trapping and reinjection in prepulse-shaped gas targets for laser-plasma accelerators

Electron trapping and reinjection in prepulse-shaped gas targets for laser-plasma accelerators
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激光等离子体加速器预脉冲形状气体靶中的电子捕获和再注入

DOI:
10.1103/physrevaccelbeams.23.111301
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发表时间:
2020
影响因子:
1.7
通讯作者:
Scott R
Scott R
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Scott R

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识别并描述了激光尾场电子加速的注入、发射选择和后加速的新颖机制。结果表明,激光预脉冲可以通过多光子电离产生电离等离子体灯丝,这会加热电子和离子,驱动与激光轴对齐的椭圆体爆炸波。随后的高强度激光脉冲产生等离子体尾场,在进入爆炸波结构的前缘时,电子密度急剧下降,导致密度下降的电子注入。注入的电子在爆炸波内被加速。主激光脉冲传播通过爆炸波后,它会在均匀背景等离子体内驱动次级尾场。在离开冲击波结构时,预加速的电子遇到这些次级尾场,被重新捕获,并加速到更高的能量。由于爆炸波的纵向范围,只有那些横向速度较小的电子被重新俘获,从而有可能产生横向尺寸和发射度减小的电子束。
A novel mechanism for injection, emittance selection, and postacceleration for laser wakefield electron acceleration is identified and described. It is shown that a laser prepulse can create an ionized plasma filament through multiphoton ionization and this heats the electrons and ions, driving an ellipsoidal blast-wave aligned with the laser-axis. The subsequent high-intensity laser-pulse generates a plasma wakefield which, on entering the leading edge of the blast-wave structure, encounters a sharp reduction in electron density, causing density down-ramp electron injection. The injected electrons are accelerated towithin the blast-wave. After the main laser-pulse has propagated past the blast-wave, it drives a secondary wakefield within the homogenous background plasma. On exiting the blast-wave structure, the preaccelerated electrons encounter these secondary wakefields, are retrapped, and accelerated to higher energies. Due to the longitudinal extent of the blast-wave, only those electrons with small transverse velocity are retrapped, leading to the potential for the generation of electron bunches with reduced transverse size and emittance.
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