Electron kinetic effects in back-stimulated Raman scattering bursts driven by broadband laser pulses

IF 4.8 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Matter and Radiation at Extremes Pub Date : 2024-05-13 DOI:10.1063/5.0189529

Q. K. Liu, L. Deng, Q. Wang, X. Zhang, F. Q. Meng, Y. P. Wang, Y. Q. Gao, H. B. Cai, S. P. Zhu

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引用次数: 0

Abstract

We examine electron kinetic effects in broadband-laser-driven back-stimulated Raman scattering (BSRS) bursts using particle-in-cell simulations. These bursts occur during the nonlinear stage, causing reflectivity spikes and generating large numbers of hot electrons. Long-duration simulations are performed to observe burst events, and a simplified model is developed to eliminate the interference of the broadband laser’s random intensity fluctuations. Using the simplified model, we isolate and characterize the spectrum of electron plasma waves. The spectrum changes from a sideband structure to a turbulence-like structure during the burst. A significant asymmetry in the spectrum is observed. This asymmetry is amplified and transferred to electron phase space by high-intensity broadband laser pulses, leading to violent vortex-merging and generation of hot electrons. The proportion of hot electrons increases from 6.76% to 14.7% during a single violent burst event. We demonstrate that kinetic effects profoundly influence the BSRS evolution driven by broadband lasers.

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宽带激光脉冲驱动的反向激励拉曼散射脉冲串中的电子动力学效应

我们利用粒子入胞模拟研究了宽带激光驱动的背刺激拉曼散射（BSRS）脉冲串中的电子动力学效应。这些猝发发生在非线性阶段，会导致反射率尖峰并产生大量热电子。我们进行了长时间模拟以观察猝发事件，并建立了一个简化模型以消除宽带激光随机强度波动的干扰。利用简化模型，我们分离并描述了电子等离子体波的频谱。在爆发过程中，频谱从边带结构变为类似湍流的结构。我们观察到频谱存在明显的不对称性。这种不对称被高强度宽带激光脉冲放大并转移到电子相空间，导致剧烈的涡流合并并产生热电子。在一次猛烈的爆发事件中，热电子的比例从 6.76% 增加到 14.7%。我们证明了动力学效应对宽带激光驱动的 BSRS 演变有着深远的影响。

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来源期刊

Matter and Radiation at Extremes Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

8.60

自引率

9.80%

发文量

160

审稿时长

15 weeks

期刊介绍： Matter and Radiation at Extremes (MRE), is committed to the publication of original and impactful research and review papers that address extreme states of matter and radiation, and the associated science and technology that are employed to produce and diagnose these conditions in the laboratory. Drivers, targets and diagnostics are included along with related numerical simulation and computational methods. It aims to provide a peer-reviewed platform for the international physics community and promote worldwide dissemination of the latest and impactful research in related fields.