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首页> 外文期刊>Plasma physics and controlled fusion >Low energy spread electron beams from ionization injection in a weakly relativistic laser wakefield accelerator
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Low energy spread electron beams from ionization injection in a weakly relativistic laser wakefield accelerator

机译：弱相对论激光尾场加速器中电离注入产生的低能扩散电子束

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摘要

We show via two-dimensional particle-in-cell simulations that low energy spread, relativistic electron beams (>120MeV, <15%) can be produced in the weakly non-linear regime of a plasma wakefield, driven by a moderate power laser pulse (initial a_0 < 1). Higher ionization states of a high-Z trace species, mixed in a background H plasma, provide the source of injected electrons. Injection occurs even though the laser intensity is initially well below the trapping threshold, as it is found that the laser pulse evolves until it fulfils the trapping requirements through self-compression. By careful control of intensity and density, the amount of evolution and hence of trapping can be controlled. Acceleration is terminated by depletion due to the extended evolution time, leading to narrow energy spread features even for long interaction lengths. Particle tracking shows that electrons 'born' at the periphery of the laser pulse are more likely to follow smoother trajectories inside the wakefield and subsequently to be trapped and accelerated.
机译：通过二维粒子模拟，我们可以证明，在中等功率激光脉冲的弱非线性范围内，可以产生低能量扩散的相对论电子束（> 120MeV，<15％） （初始a_0 <1）。在背景H等离子体中混合的高Z痕量物质的更高电离态提供了注入电子的来源。即使发现激光强度最初远低于捕获阈值，也会发生注入，因为发现激光脉冲会不断发展直至通过自压缩满足捕获要求。通过仔细控制强度和密度，可以控制进化的量以及因此的捕获量。加速因延长的进化时间而耗尽而终止，即使相互作用时间长，也会导致狭窄的能量扩散特征。粒子跟踪表明，在激光脉冲外围“生”的电子更有可能遵循尾波场内更平滑的轨迹，随后被捕获并加速。

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