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

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

机构地区：[1]Graduate School,China Academy of Engineering Physics,Beijing 100088,China [2]Institute of Applied Physics and Computational Mathematics,Beijing 100094,China [3]School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,China [4]Shanghai Institute of Laser Plasma,Shanghai 201800,China [5]HEDPS,Center for Applied Physics and Technology,Peking University,Beijing 100871,China [6]School of Physics,Zhejiang University,Hangzhou 310027,China

出　　处：《Matter and Radiation at Extremes》2024年第4期54-67,共14页极端条件下的物质与辐射（英文）

基　　金：project is supported by the National Key R&D Program of China(Grant No.2022YFA1603204);the National Natural Science Foundation of China(Grant Nos.12325510,12235014,and 11975055).

摘　　要：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.

关 键 词：SCATTERING KINETIC simplified 

分 类 号：TN24[电子电信—物理电子学]