论文标题
由短强度激光脉冲驱动的引导电磁排放脉冲：表征和建模
Guided Electromagnetic Discharge Pulses Driven by Short Intense Laser Pulses: Characterisation and Modelling
论文作者
论文摘要
强电磁脉冲（EMP）是由与固体密度靶标的强烈激光相互作用产生的，并且可以通过目标几何形状来指导，特别是通过与地面的导电连接。我们通过时间和空间分辨的质子挠度测定法提出了一个实验表征，该表征是沿着电线的引导电磁排放脉冲，包括线圈，由0.5 ps，50 J，1E19 w/cm2激光脉冲驱动。质子 - 转换数据允许由于激光驱动的目标充电，然后通过导电目标茎从地面上返回EMP，首先溶解EMP。两种EMP都有典型的PS的典型持续时间，并且对应于Ka范围内的电流，具有多个GV/m的电场幅度。由于磁场和电场的贡献，靶杆中的亚MM线圈对探针产生镜头效应。这样，10 MeV能量范围的质子集中在CM尺度距离上。实验结果通过分析建模和高分辨率数值粒子中的模拟来支持，从而揭示了表面等离子体的可能存在，该表面等离子体定义了非线性传播状态中的放电脉冲分散体。
Strong electromagnetic pulses (EMP) are generated from intense laser interactions with solid-density targets, and can be guided by the target geometry, specifically through conductive connections to the ground. We present an experimental characterization, by time- and spatial-resolved proton deflectometry, of guided electromagnetic discharge pulses along wires including a coil, driven by 0.5 ps, 50 J, 1e19 W/cm2 laser pulses. Proton-deflectometry data allows to time-resolve first the EMP due to the laser-driven target charging and then the return EMP from the ground through the conductive target stalk. Both EMPs have a typical duration of tens of ps and correspond to currents in the kA-range with electric-field amplitudes of multiple GV/m. The sub-mm coil in the target rod creates lensing effects on probing protons, due to both magnetic- and electric-field contributions. This way, protons of 10 MeV-energy range are focused over cm-scale distances. Experimental results are supported by analytical modelling and high-resolution numerical particle-in-cell simulations, unraveling the likely presence of a surface plasma, which parameters define the discharge pulse dispersion in the non-linear propagation regime.
