XUV探测辐射冲击实验的靶设计
Target Design for XUV Probing of Radiative Shock Experiments
摘要：
辐射冲击是一种强烈的冲击，其特征是等离子体在高温下以辐射形式发射出其能量的重要部分。辐射激波是许多天体物理系统中常见的现象，是辐射流体力学流动的模板，可以用高功率激光进行实验研究。这不仅在实验室天体物理学方面很重要，而且对基准数值研究也很重要。我们目前的详细设计在氙气辐射冲击的实验在千焦规模的PALS激光设施。它包括技术规格的管目标设计和数值研究与1-D辐射流体动力学代码MULTI。重点是给出的技术可行性的XUV成像诊断与21 nm（~58 eV）的探测光束，它允许同时探测后冲击和冲击前体区域。新设计的目标与改进的X射线光学和XUV源一起允许显示密集的激波后结构和辐射激波的前兆。
英文摘要：
Radiative shocks are strong shocks characterized by plasma at a high temperature emitting an important fraction of its energy as radiation. Radiative shocks are commonly found in many astrophysical systems and are templates of radiative hydrodynamic flows, which can be studied experimentally using high-power lasers. This is not only important in the context of laboratory astrophysics but also to benchmark numerical studies. We present details on the design of experiments on radiative shocks in xenon gas performed at the kJ scale PALS laser facility. It includes technical specifications for the tube targets design and numerical studies with the 1-D radiative hydrodynamics code MULTI. Emphasis is given to the technical feasibility of an XUV imaging diagnostic with a 21 nm (~58 eV) probing beam, which allows to probe simultaneously the post-shock and the precursor region ahead of the shock. The novel design of the target together with the improved X-ray optics and XUV source allow to show both the dense post-shock structure and the precursor of the radiative shock.
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