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

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

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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 asymme-try 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.

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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Graduate School,China Academy of Engineering Physics,Beijing 100088,China

Institute of Applied Physics and Computational Mathematics,Beijing 100094,China

School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,China

Shanghai Institute of Laser Plasma,Shanghai 201800,China

HEDPS,Center for Applied Physics and Technology,Peking University,Beijing 100871,China

School of Physics,Zhejiang University,Hangzhou 310027,China

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National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2022YFA1603204123255101223501411975055

2024

10.1063/5.0189529

极端条件下的物质与辐射(英文)
中国工程物理研究院科技信息中心

极端条件下的物质与辐射(英文)

ISSN：2468-2047
年,卷(期)：2024.9(4)