Surface heating of wire plasmas using laser-irradiated cone geometries
Surface heating of wire plasmas using laser-irradiated cone geometries
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DOI：
10.1038/nphys755
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发表时间：
2007-12
期刊：
影响因子：
19.6
通讯作者：
James C. Green;K. Lancaster;K. Akli;C. Gregory;F. Beg;Sophia N Chen;D. Clark;R. Freeman;S. Hawkes;C. Hernandez-Gomez;H. Habara;R. Heathcote;D. Hey;K. Highbarger;M. Key;R. Kodama;K. Krushelnick;I. Musgrave;Hirotaka Nakamura;M. Nakatsutsumi;N. Patel;R. Stephens;M. Storm;M. Tampo;W. Theobald;L. V. Woerkom;R. Weber;M. Wei;N. Woolsey;P. Norreys
中科院分区：
文献类型：
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作者：
James C. Green;K. Lancaster;K. Akli;C. Gregory;F. Beg;Sophia N Chen;D. Clark;R. Freeman;S. Hawkes;C. Hernandez-Gomez;H. Habara;R. Heathcote;D. Hey;K. Highbarger;M. Key;R. Kodama;K. Krushelnick;I. Musgrave;Hirotaka Nakamura;M. Nakatsutsumi;N. Patel;R. Stephens;M. Storm;M. Tampo;W. Theobald;L. V. Woerkom;R. Weber;M. Wei;N. Woolsey;P. Norreys
拍瓦激光器可以产生极端的物质状态，使其成为高能量密度物理学的独特工具。当耦合效率高且温度达到 2–4keV（参考文献）时，锥线目标可能会产生千兆巴范围的压力。获得如此巨大压力的唯一其他方法是使用正在建造的兆焦耳激光设施（国家点火设施和兆焦耳激光设施）。能量可以传输非常长的距离，但到目前为止，其引导机制仍不清楚。在这里，我们通过将干涉测量与流体动力学模拟进行比较，提出了第一个明确的实验证明，证明靠近金属丝表面的加热最大化。新的混合颗粒细胞模拟首次显示了复杂的场结构，包括导线内部磁场的反转。这增加了导线表面下方空间分离的薄层中的返回电流，从而增强了欧姆加热水平。高能量密度科学中有大量应用，从状态方程研究到明亮的硬 X 射线源，这些应用都将从对能量传输的新理解中受益。
Petawatt lasers can generate extreme states of matter, making them unique tools for high-energy-density physics. Pressures in the gigabar regime can potentially be generated with cone-wire targets when the coupling efficiency is high and temperatures reach 2–4 keV (ref. ). The only other method of obtaining such gigantic pressures is to use the megajoule laser facilities being constructed (National Ignition Facility and Laser MégaJoule). The energy can be transported over surprisingly long distances but, until now, the guiding mechanism has remained unclear. Here, we present the first definitive experimental proof that the heating is maximized close to the wire surface, by comparison of interferometric measurements with hydrodynamic simulations. New hybrid particle-in-cell simulations show the complex field structures for the first time, including a reversal of the magnetic field on the inside of the wire. This increases the return current in a spatially separated thin layer below the wire surface, resulting in the enhanced level of ohmic heating. There are a significant number of applications in high-energy-density science, ranging from equation-of-state studies to bright, hard X-ray sources, that will benefit from this new understanding of energy transport.