使用千焦级拍瓦laser相互作用将纳米线阵列体积加热到keV温度
Volumetric heating of nanowire arrays to keV temperatures using kilojoule-scale petawatt laser interactions
摘要：
我们提出了皮秒分辨率条纹K壳光谱从400 nm直径的镍纳米线阵列，展示了产生大量的高能量密度等离子体的能力，当结合典型的最大的短脉冲激光器的较长脉冲。在用100 J，600 fs的超高对比度激光脉冲聚焦到$>10^{20}$ W/cm $^{2}$在猎户座激光设施照射线阵列后，我们结合原子动力学模型的条纹光谱与二维碰撞粒子在细胞模拟来描述这些样品内的材料条件的演变为第一次。我们观察到一个三倍的增强类氦发射相比，在近固体密度的等离子体维持千电子伏的温度为几十皮秒，强大的电返回电流加热的电线，并导致它们爆炸和碰撞的结果，一个平面箔。
英文摘要：
We present picosecond-resolution streaked K-shell spectra from 400 nm-diameter nickel nanowire arrays, demonstrating the ability to generate large volumes of high energy density plasma when combined with the longer pulses typical of the largest short pulse lasers. After irradiating the wire array with 100 J, 600 fs ultra-high-contrast laser pulses focussed to $>10^{20}$ W/cm$^{2}$ at the Orion laser facility, we combine atomic kinetics modeling of the streaked spectra with 2D collisional particle-in-cell simulations to describe the evolution of material conditions within these samples for the first time. We observe a three-fold enhancement of helium-like emission compared to a flat foil in a near-solid-density plasma sustaining keV temperatures for tens of picoseconds, the result of strong electric return currents heating the wires and causing them to explode and collide.
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