Experimental and simulation data [Moreau et al., Plasma Phys. Control. Fusion 62, 014013 (2019); Kaymak et al., Phys. Rev. Lett. 117, 035004 (2016)] indicate that self-generated magnetic fields play an important role in enhancing the flux and energy of relativistic electrons accelerated by ultra-intense laser pulse irradiation with nanostructured arrays. A fully relativistic analytical model for the generation of the magnetic field based on electron magneto-hydrodynamic description is presented here. The analytical model shows that this self-generated magnetic field originates in the nonparallel density gradient and fast electron current at the interfaces of a nanolayered target. A general formula for the self-generated magnetic field is found, which closely agrees with the simulation scaling over the relevant intensity range. The result is beneficial to the experimental designs for the interaction of the laser pulse with the nanostructured arrays to improve laser-to-electron energy coupling and the quality of forward hot electrons.

中文翻译：

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超强激光脉冲与纳米结构靶相互作用中100 MG磁场的产生机制

实验和模拟数据 [Moreau等。，等离子物理。控制。融合62, 014013 (2019); 凯马克等。, 物理。牧师莱特。117, 035004 (2016)] 表明自生磁场在增强由纳米结构阵列的超强激光脉冲照射加速的相对论电子的通量和能量方面发挥着重要作用。这里提出了一个基于电子磁流体动力学描述的磁场产生的完全相对论分析模型。分析模型表明，这种自生磁场源于纳米层靶界面处的非平行密度梯度和快速电子流。找到了自生磁场的通用公式，该公式与相关强度范围内的模拟比例非常吻合。