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

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

doi:10.1063/5.0189529

Volume 9 Issue 4

Jul. 2024

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Liu Q. K., Deng L., Wang Q., Zhang X., Meng F. Q., Wang Y. P., Gao Y. Q., Cai H. B., Zhu S. P.. Electron kinetic effects in back-stimulated Raman scattering bursts driven by broadband laser pulses[J]. Matter and Radiation at Extremes, 2024, 9(4): 047402. doi: 10.1063/5.0189529

Citation:

Liu Q. K., Deng L., Wang Q., Zhang X., Meng F. Q., Wang Y. P., Gao Y. Q., Cai H. B., Zhu S. P.. Electron kinetic effects in back-stimulated Raman scattering bursts driven by broadband laser pulses[J]. Matter and Radiation at Extremes, 2024, 9(4): 047402. doi: 10.1063/5.0189529

Citation:

Liu Q. K., Deng L., Wang Q., Zhang X., Meng F. Q., Wang Y. P., Gao Y. Q., Cai H. B., Zhu S. P.. Electron kinetic effects in back-stimulated Raman scattering bursts driven by broadband laser pulses[J]. Matter and Radiation at Extremes, 2024, 9(4): 047402. doi: 10.1063/5.0189529

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

doi: 10.1063/5.0189529

Liu Q. K.^{1, 2
,},
Deng L.^{1, 2, 3
,},
Wang Q.^2
,,
Zhang X.^{1, 2
,},
Meng F. Q.^{1, 2},
Wang Y. P.^{1, 2
,},
Gao Y. Q.^4
,,
Cai H. B.^{2, 5, 6
,
,
,},
Zhu S. P.^{1, 2
,
,}

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

More Information

Author Bio:
Electronic mail: zhu_shaoping@iapcm.ac.cn
Corresponding author: a)Author to whom correspondence should be addressed: cai_hongbo@iapcm.ac.cn
Received Date: 2023-11-29
Accepted Date: 2024-04-21

Available Online: 2024-07-01

Publish Date: 2024-07-01

Abstract

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.

The authors have no conflicts to disclose.
Conflict of Interest
Q. K. Liu: Formal analysis (equal); Investigation (equal); Methodology (equal); Validation (equal); Visualization (equal); Writing – original draft (equal). L. Deng: Investigation (equal); Methodology (equal); Writing – review & editing (equal). Q. Wang: Formal analysis (equal); Methodology (equal); Writing – review & editing (equal). X. Zhang: Visualization (equal); Writing – review & editing (equal). F. Q. Meng: Visualization (equal); Writing – review & editing (equal). Y. P. Wang: Visualization (equal); Writing – review & editing (equal). Y. Q. Gao: Conceptualization (equal); Investigation (equal); Writing – review & editing (equal). H. B. Cai: Conceptualization (equal); Funding acquisition (equal); Methodology (equal); Project administration (equal); Software (equal); Supervision (equal); Validation (equal); Writing – review & editing (equal). S. P. Zhu: Conceptualization (equal); Funding acquisition (equal); Project administration (equal); Supervision (equal); Validation (equal); Writing – review & editing (equal).
Author Contributions
The data that support the findings of this study are available from the corresponding author upon reasonable request.

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References(52)

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