Effect of equation of state on laser imprinting by comparing diamond and polystyrene foils
Effect of equation of state on laser imprinting by comparing diamond and polystyrene foils
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DOI：
10.1063/1.5018906
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发表时间：
2018-03
影响因子：
2.2
通讯作者：
H. Kato;K. Shigemori;H. Nagatomo;M. Nakai;T. Sakaiya;T. Ueda;H. Terasaki;Y. Hironaka;K. Shimizu;H. Azechi
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文献类型：
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作者：
H. Kato;K. Shigemori;H. Nagatomo;M. Nakai;T. Sakaiya;T. Ueda;H. Terasaki;Y. Hironaka;K. Shimizu;H. Azechi
本文研究了状态方程对非均匀激光辐照惯性聚变靶的激光压印的影响。已经提出，基于具有压力扰动的运动方程，更硬和更致密的材料将减少激光压印。我们研究了详细的时间演化的印记振幅使用二维辐射流体动力学模拟PINOCO-2D的金刚石，这是一个候选人的刚性烧蚀材料的惯性聚变目标。模拟的激光压印振幅进行比较，通过使用面上的X射线背光的金刚石和聚苯乙烯（PS）（后者作为参考）获得的面密度扰动的实验测量。PINOCO-2D模拟的结果很好地再现了实验结果，这表明由于非均匀照射（平均强度，4.0 × 1012至5.0 × 1013）导致的压印振幅在金刚石和PS之间相差2至3倍。激光压印的差异主要与材料的密度和可压缩性有关。这些参数是决定激光压印幅度的关键因素，本文研究了状态方程对非均匀激光辐照惯性聚变靶的激光压印的影响。已经提出，基于具有压力扰动的运动方程，更硬和更致密的材料将减少激光压印。我们研究了详细的时间演化的印记振幅使用二维辐射流体动力学模拟PINOCO-2D的金刚石，这是一个候选人的刚性烧蚀材料的惯性聚变目标。模拟的激光压印振幅进行比较，通过使用面上的X射线背光的金刚石和聚苯乙烯（PS）（后者作为参考）获得的面密度扰动的实验测量。PINOCO-2D模拟结果与实验结果吻合较好，表明非均匀辐照（平均强度为4.0 × 1012 ~ 5.0 × 1013）导致的金刚石和金刚石之间的压印幅度相差2 ~ 3倍。
We present herein a comprehensive study of how the equation of state affects laser imprinting by nonuniform laser irradiation of an inertial fusion target. It has been suggested that a stiffer and denser material would reduce laser imprinting based on the equation of motion with pressure perturbation. We examine the detailed temporal evolution of the imprint amplitude by using the two-dimensional radiation hydrodynamic simulation PINOCO-2D for diamond, which is a candidate stiff-ablator material for inertial fusion targets. The simulated laser imprinting amplitude is compared with experimental measurements of areal-density perturbations obtained by using face-on x-ray backlighting for diamond and polystyrene (PS) (the latter as a reference). The experimental results are well reproduced by the results of the PINOCO-2D simulation, which indicates that the imprinting amplitude due to nonuniform irradiation (average intensity, 4.0 × 1012 to 5.0 × 1013) differs by a factor of two to three between diamond and PS. The difference in laser imprinting is mainly related to the material density and compressibility. These parameters are key factors that determine the laser imprinting amplitude.We present herein a comprehensive study of how the equation of state affects laser imprinting by nonuniform laser irradiation of an inertial fusion target. It has been suggested that a stiffer and denser material would reduce laser imprinting based on the equation of motion with pressure perturbation. We examine the detailed temporal evolution of the imprint amplitude by using the two-dimensional radiation hydrodynamic simulation PINOCO-2D for diamond, which is a candidate stiff-ablator material for inertial fusion targets. The simulated laser imprinting amplitude is compared with experimental measurements of areal-density perturbations obtained by using face-on x-ray backlighting for diamond and polystyrene (PS) (the latter as a reference). The experimental results are well reproduced by the results of the PINOCO-2D simulation, which indicates that the imprinting amplitude due to nonuniform irradiation (average intensity, 4.0 × 1012 to 5.0 × 1013) differs by a factor of two to three between diamond and P...