论文标题
通过携带轨道角动量的电流电子返回电流电子，在激光辐射的薄箔中放大磁场
Magnetic field amplification in a laser-irradiated thin foil by return current electrons carrying orbital angular momentum
论文作者
论文摘要
磁化的高能量密度物理学为在激光 - 血浆环境中首次观察磁场相关物理提供了新的机会。我们专注于这样一种现象，这是激光辐照磁化等离子体扩增种子磁场的能力。我们通过picsecond尺度相对论激光脉冲$ 4.2 \ times 10^{18} $ w/cm $^2 $进行了一系列全动力学3D磁场扩增的3D模拟。我们观察到轴向磁场在几立方微米的体积上从初始0.1 kt种子到1.5 kt的扩增，比激光脉冲持续时间长数百个飞秒。磁场放大是由电子在回流电流中驱动的，从种子磁场获得了有利的轨道角动量。这种机制对激光极化是可靠的，并且在一系列仿真参数上提供了刻度的扩增。
Magnetized high energy density physics offers new opportunities for observing magnetic field-related physics for the first time in the laser-plasma context. We focus on one such phenomenon, which is the ability of a laser-irradiated magnetized plasma to amplify a seed magnetic field. We performed a series of fully kinetic 3D simulations of magnetic field amplification by a picosecond-scale relativistic laser pulse of intensity $4.2\times 10^{18}$ W/cm$^2$ incident on a thin foil. We observe axial magnetic field amplification from an initial 0.1 kT seed to 1.5 kT over a volume of several cubic microns, persisting hundreds of femtoseconds longer than the laser pulse duration. The magnetic field amplification is driven by electrons in the return current gaining favorable orbital angular momentum from the seed magnetic field. This mechanism is robust to laser polarization and delivers order-of-magnitude amplification over a range of simulation parameters.
