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首页> 美国卫生研究院文献>Scientific Reports >Micron-scale mapping of megagauss magnetic fields using optical polarimetry to probe hot electron transport in petawatt-class laser-solid interactions
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Micron-scale mapping of megagauss magnetic fields using optical polarimetry to probe hot electron transport in petawatt-class laser-solid interactions

机译：使用光学极化仪在兆瓦级磁场中进行微米级映射以探测热电传输在千兆瓦级激光与固体之间的相互作用

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摘要

The transport of hot, relativistic electrons produced by the interaction of an intense petawatt laser pulse with a solid has garnered interest due to its potential application in the development of innovative x-ray sources and ion-acceleration schemes. We report on spatially and temporally resolved measurements of megagauss magnetic fields at the rear of a 50-μm thick plastic target, irradiated by a multi-picosecond petawatt laser pulse at an incident intensity of ~1020 W/cm2. The pump-probe polarimetric measurements with micron-scale spatial resolution reveal the dynamics of the magnetic fields generated by the hot electron distribution at the target rear. An annular magnetic field profile was observed ~5 ps after the interaction, indicating a relatively smooth hot electron distribution at the rear-side of the plastic target. This is contrary to previous time-integrated measurements, which infer that such targets will produce highly structured hot electron transport. We measured large-scale filamentation of the hot electron distribution at the target rear only at later time-scales of ~10 ps, resulting in a commensurate large-scale filamentation of the magnetic field profile. Three-dimensional hybrid simulations corroborate our experimental observations and demonstrate a beam-like hot electron transport at initial time-scales that may be attributed to the local resistivity profile at the target rear.
机译：由强大的petawatt激光脉冲与固体相互作用产生的热的相对论电子的传输已经引起了人们的兴趣，这是因为其在创新X射线源和离子加速方案开发中的潜在应用。我们报告了在50μm厚塑料靶后面的兆高斯磁场的时空分辨测量结果，该入射强度由约10 sup> 20 W / cm 2 。具有微米级空间分辨率的泵浦探针极化测量显示了由靶后部热电子分布产生的磁场的动态。相互作用后约5 ps观察到环形磁场分布，表明在塑料靶的背面有相对平滑的热电子分布。这与先前的时间积分测量相反，后者推测此类目标将产生高度结构化的热电子传输。我们仅在后来的〜10 ps的时间尺度上才在目标后部测量了热电子分布的大规模细丝化，从而导致了磁场分布的相应大规模细丝化。三维混合模拟证实了我们的实验观察结果，并证明了在初始时间尺度上的束状热电子传输，这可能归因于目标后部的局部电阻率分布。

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