Two-dimensional particle-in-cell simulations for laser plasma interaction with laser intensity of ${10}^{16}\mathrm{W}/{\mathrm{cm}}^2$, plasma density range of $0.01–0.28n_c$, and scale length of $230–330\mu \mathrm{m}$ showed significant pump depletion of the laser energy due to stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) in the low-density region ($n_e=0.01–0.2n_c$). The simulations identified hot electrons generated by SRS in the low-density region with moderate energy and by two-plasmon-decay near $n_e=0.25n_c$ with higher energy. The overall hot electron temperature (46 keV) and conversion efficiency (3%) were consistent with the experiment's measurements. The simulations also showed artificially reducing SBS would lead to stronger SRS and a softer hot-electron spectrum.

中文翻译：

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冲击点火高强度激光在长密度标度等离子体中的泵浦耗尽和热电子生成

激光强度与激光强度相互作用的二维粒子模拟 ${10}^{16}\mathrm{w\; ^}/{\mathrm{厘米}}^2$，血浆密度范围 $0.01–0.28{ñ}_C$，刻度长度为 $230–330\mu \mathrm{米}$ 由于低密度区域中的受激拉曼散射（SRS）和受激布里渊散射（SBS）导致激光能量显着泵浦耗尽（${ñ}_{Ë}=0.01–0.2{ñ}_C$）。模拟确定了由SRS在低密度区域以中等能量产生的热电子，并且在附近有两个等离子体激元衰减${ñ}_{Ë}=0.25{ñ}_C$具有更高的能量。总体热电子温度（46 keV）和转换效率（3％）与实验的测量结果一致。仿真还表明，人为地减少SBS会导致更强的SRS和更软的热电子光谱。