Electron kinetic effects in back-stimulated Raman scattering bursts driven by broadband laser pulsesOA
Electron kinetic effects in back-stimulated Raman scattering bursts driven by broadband laser pulses
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
Graduate School,China Academy of Engineering Physics,Beijing 100088,China||Institute of Applied Physics and Computational Mathematics,Beijing 100094,ChinaGraduate 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,ChinaInstitute of Applied Physics and Computational Mathematics,Beijing 100094,ChinaShanghai Institute of Laser Plasma,Shanghai 201800,ChinaInstitute of Applied Physics and Computational Mathematics,Beijing 100094,China||HEDPS,Center for Applied Physics and Technology,Peking University,Beijing 100871,China||School of Physics,Zhejiang University,Hangzhou 310027,China
《极端条件下的物质与辐射（英文）》 2024 (004)
54-67 / 14
This project is supported by the National Key R&D Program of China(Grant No.2022YFA1603204)and the National Natural Science Foundation of China(Grant Nos.12325510,12235014,and 11975055).Valuable discussions with Professor Chunyang Zheng,Professor Zhanjun Liu,Dr.Enhao Zhang,and Dr.Hongyu Zhou have been beneficial for this research.
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