Circularly polarized x-ray generation from an ionization induced laser plasma electron accelerator
Circularly polarized x-ray generation from an ionization induced laser plasma electron accelerator
复制标题
电离诱导激光等离子体电子加速器产生圆偏振 X 射线
DOI：
10.1088/1361-6587/abaf0b
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发表时间：
2020
影响因子：
2.2
通讯作者：
Chen Liming
中科院分区：
文献类型：
--
作者：
Feng Jie;Li Yifei;Geng Xiaotao;Li Dazhang;Wang Jinguang;Mirzaie Mohammad;Chen Liming
激光等离子体加速器可以提供高强度的X射线辐射，作为下一代紧凑型辐射源的基础。然而，对于辐射偏振，特别是圆偏振，仍然缺乏可调谐性。在这里，我们提出了一种新的方法来实现强烈的圆偏振X射线通过圆偏振20 TW激光脉冲驱动等离子体韦克菲尔德加速的电离注入制度。当激光脉冲持续时间足够长时，电离注入的电子不仅具有角动量，而且与激光脉冲发生共振，在加速过程中形成螺旋结构轨迹。在我们的模拟中，我们获得了圆偏振度Pc <$0.8，脉冲宽度<$16 fs，能谱峰值<$1 keV和亮度<$1.8 × 1020光子s-1 mm-2 mrad-2/0.1%BW的同步辐射。这种超快、超亮的圆偏振X射线源在分析复杂的生物大分子结构和探测热致密物质方面具有良好的应用前景。
A laser plasma accelerator could provide high-intensity x-ray radiation as the basis for the next generation compact radiation source. However, there is still a lack of tunability for the radiation polarization, especially the circular polarization. Here, we propose a new method for achieving intense circularly polarized x-rays via circularly polarized 20 TW laser pulses driving plasma wakefield acceleration in the regime of ionization injection. When the laser pulse duration is long enough, the ionization injected electrons would not only possess angular momentum, but also be resonant with the laser pulses, resulting in helix structure trajectories in the process of acceleration. In our simulation, we acquired synchrotron radiation with the circularly polarized degree Pc ∼ 0.8, the pulse duration ∼16 fs, the energy spectrum peak ∼1 keV and the brilliance ∼1.8 × 1020 photons s−1 mm−2 mrad−2/0.1%BW. Such an ultra-fast and ultra-brilliant circularly polarized x-ray source has excellent application prospects in the analysis of complex bio-macro-molecule structures and for probing warm dense matter.