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arXiv 2108.06221physics.plasm-ph
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超高强度区表面等离子体波激发的关键参数

Key parameters for surface plasma wave excitation in the ultra-high intensity regime

S. Marini, P. S. Kleij, F. Amiranoff, M. Grech, C. Riconda, M. Raynaud

摘要:

超短脉冲高功率激光器可以产生极高的光强($\ge 10^{20}$ W/cm $^2$和$\leq 30 f$ s),在过密等离子体表面产生大振幅的表面等离子体波(SPW)。由此产生的高能电子的电流有很大的兴趣的应用,潜在的缩放与激光振幅,提供的激光等离子体转移到加速粒子介导的SPW仍然是有效的超高强度。通过Particle-in-Cell模拟,我们确定了SPW激发的最佳条件,并显示了最佳表面等离子体波激发角和激光入射角之间的强相关性,优化了沿等离子体表面的电子加速。我们还讨论了如何调整等离子体密度和等离子体表面形状,以推动更高的激光强度的限制表面等离子体波激发。我们的研究结果为即将到来的多拍瓦激光系统的新实验开辟了道路。

英文摘要:

Ultra-short high-power lasers can deliver extreme light intensities ($\ge 10^{20}$ W/cm$^2$ and $\leq 30 f$s) and drive large amplitude Surface Plasma Wave (SPW) at over-dense plasma surface. The resulting current of energetic electron has great interest for applications, potentially scaling with the laser amplitude, provided the laser-plasma transfer to the accelerated particles mediated by SPW is still efficient at ultra-high intensity. By mean of Particle-in-Cell simulations, we identify the best condition for SPW excitation and show a strong correlation between the optimum Surface Plasma Wave excitation angle and the laser's angle of incidence that optimize the electron acceleration along the plasma surface. We also discuss how plasma density and plasma surface shape can be adjusted in order to push to higher laser intensity the limit of Surface Plasma Wave excitation. Our results open the way to new experiments on forthcoming multi-petawatt laser systems.

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