Backward scattering of laser plasma interactions from hundreds-of-joules broadband laser on thick target

Wang, Peipei; An, Honghai; Fang, Zhiheng; Xiong, Jun; Xie, Zhiyong; Wang, Chen; He, Zhiyu; Jia, Guo; Wang, Ruirong; Zheng, Shu; Xia, Lan; Feng, Wei; Shi, Haitao; Wang, Wei; Sun, Jinren; Gao, Yanqi; Fu, Sizu

doi:10.1063/5.0122406

Matter and Radiation at Extremes

2023

DOI: 10.1063/5.0122406

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Backward scattering of laser plasma interactions from hundreds-of-joules broadband laser on thick target

Peipei Wang,

Honghai An,

Zhiheng Fang

et al.

Abstract: The use of broadband laser technology is a novel approach for inhibiting processes related to laser plasma interactions (LPIs). In this study, several preliminary experiments into broadband-laser-driven LPIs are carried out using a newly established hundreds-of-joules broadband second-harmonic-generation laser facility. Through direct comparison with LPI results for a traditional narrowband laser, the actual LPI-suppression effect of the broadband laser is shown. The broadband laser had a clear suppressive eff… Show more

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2024

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Cited by 9 publications

References 25 publications

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

Liu,

Deng,

Wang

et al. 2024

Matter and Radiation at Extremes

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

Liu,

Deng,

Wang

et al. 2024

Matter and Radiation at Extremes

View full text Add to dashboard Cite

show abstract

Anomalous hot electron generation from two-plasmon decay instability driven by broadband laser pulses with intensity modulations

Yao,

Li,

Hao

et al. 2024

Nucl. Fusion

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We investigate the hot electrons generated from two-plasmon decay (TPD) instability driven by laser pulses with intensity modulated by a frequency $\Delta \omega_m$ using theoretical and numerical approaches.Our primary focus lies on scenarios where $\Delta \omega_m$ is on the same order of the TPD growth rate $ \gamma_0$ ( $\Delta \omega_m \sim \gamma_0$), corresponding to moderate laser frequency bandwidths for TPD mitigation. With $\Delta \omega_m$ conveniently modeled by a basic two-color scheme of the laser wave fields in fully-kinetic particle-in-cell simulations, we demonstrate that the energies of TPD modes and hot electrons exhibit intermittent evolution at the frequency $\Delta \omega_m$, particularly when $\Delta \omega_m \sim \gamma_0$. With the dynamic TPD behavior, the overall ratio of hot electron energy to the incident laser energy, $f_{hot}$, changes significantly with $\Delta \omega_m$. While $f_{hot}$ drops notably with increasing $\Delta \omega_m$ at large $\Delta \omega_m$ limit as expected, it goes anomalously beyond the hot electron energy ratio for a single-frequency incident laser pulse with the same average intensity when $\Delta \omega_m$ falls below a specific threshold frequency $\Delta \omega_c$. This anomaly arises from the pronounced sensitivity of $f_{hot}$ to variations in laser intensity. We find this threshold frequency $\Delta \omega_c$ primarily depends on $\gamma_0$ and the collisional damping rate of plasma waves, with relatively lower sensitivity to the density scale length. We develop a scaling model characterizing the relation of $\Delta \omega_c$ and laser plasma conditions, enabling the potential extention of our findings to more complex and realistic scenarios.

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Impact of electron trapping on stimulated Raman scattering under incoherent broadband laser light in homogeneous plasma

Blackman,

Tikhonchuk,

Klimo

et al. 2024

Phys. Rev. E

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Backward scattering of laser plasma interactions from hundreds-of-joules broadband laser on thick target

Cited by 9 publications

References 25 publications

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

Anomalous hot electron generation from two-plasmon decay instability driven by broadband laser pulses with intensity modulations

Impact of electron trapping on stimulated Raman scattering under incoherent broadband laser light in homogeneous plasma

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