Ultrahigh-charge electron beams from laser-irradiated solid surface.
Ultrahigh-charge electron beams from laser-irradiated solid surface.
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来自激光照射固体表面的超高电荷电子束
DOI：
10.1073/pnas.1800668115
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发表时间：
2018-07-03
影响因子：
11.1
通讯作者：
Zhang J
中科院分区：
文献类型：
--
作者：
Ma Y;Zhao J;Li Y;Li D;Chen L;Liu J;Dann SJD;Ma Y;Yang X;Ge Z;Sheng Z;Zhang J
激光等离子体加速器（LPA）由于其超高的加速梯度，在近三十年来得到了迅速的发展，使其成为一种非常有前途的小型加速器和光源。自LPA概念诞生以来，以尽可能小的发散角和尽可能高的束电荷加速高质量的电子束一直是一个长期的目标。然而，到目前为止，最流行的加速场景未能实现这两个目标。利用强激光脉冲与固体靶相互作用，获得了高电荷量（100 nC）、小发散角、高准直电子束。利用激光与等离子体相互作用对高电荷相对论电子束进行紧凑加速具有许多独特的应用。然而，目前公知的方案，包括从气体的激光韦克菲尔德加速和从固体的真空激光加速，通常产生电子束具有低电荷或具有大的发散角。在这项工作中，我们报告的高度准直的电子束的发散角为几度，非热谱峰值在megaelectronvolt级，和极高的电荷（100 nC）通过一个强大的亚皮秒激光脉冲与固体靶在掠入射相互作用的产生。粒子模拟说明了一个直接的激光加速的情况下，在一个大规模的近临界密度等离子体和电子束团被周期性地加速和准直的超强电磁场中的自致发光被触发。这种电子束在高Z材料中的能量密度达到，使其成为驱动温暖甚至热的致密物质状态的有希望的工具。
In the last three decades, the laser–plasma accelerator (LPA) has shown a rapid development owing to its super–high-accelerate gradients, which makes it a very promising compact accelerator and light source. Acceleration of a high-quality electron beam with divergence angle as small as possible and beam charge as high as possible has been a long-term goal ever since the inception of the LPA concept. However, until now the most popular acceleration scenario has failed to achieve both goals. We solved this problem and obtained tightly collimated electron beams with small divergence angle and extremely high beam charge (100 nC) via the powerful laser pulse interacting with a solid target. Compact acceleration of a tightly collimated relativistic electron beam with high charge from a laser–plasma interaction has many unique applications. However, currently the well-known schemes, including laser wakefield acceleration from gases and vacuum laser acceleration from solids, often produce electron beams either with low charge or with large divergence angles. In this work, we report the generation of highly collimated electron beams with a divergence angle of a few degrees, nonthermal spectra peaked at the megaelectronvolt level, and extremely high charge (100 nC) via a powerful subpicosecond laser pulse interacting with a solid target in grazing incidence. Particle-in-cell simulations illustrate a direct laser acceleration scenario, in which the self-filamentation is triggered in a large-scale near–critical-density plasma and electron bunches are accelerated periodically and collimated by the ultraintense electromagnetic field. The energy density of such electron beams in high-Z materials reaches to , making it a promising tool to drive warm or even hot dense matter states.
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