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arXiv 1502.06082physics.plasm-ph
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用改进的第一性原理方法建立K吸收边与热密等离子体热力学性质之间的联系

Link between K-absorption edges and thermodynamic properties of warm-dense plasmas established by improved first-principles method

Shen Zhang, Shijun Zhao, Wei Kang, Ping Zhang, Xian-Tu He

摘要:

通过精确的计算,将X射线K吸收边的变化转化为热力学性质的变化,可以利用X射线吸收技术定量表征温暖稠密等离子体的内部热力学性质,为惯性约束聚变等天体物理应用提供必要的信息。我们表明,这种解释可以通过改进的第一性原理方法来实现。我们的计算表明,K边的移动表现出选择性的热参数的敏感性,因此将是一个合适的温度指数温暖稠密等离子体。我们还表明,与其他实验工具相结合时,一个简单的模型,K-边缘的移动可以用来检测温暖的致密等离子体内部的不均匀性。

英文摘要:

A precise calculation that translates shifts of X-ray K-absorption edges to variations of thermodynamic properties allows quantitative characterization of interior thermodynamic properties of warm dense plasmas by X-ray absorption techniques, which provides essential information for inertial confinement fusion and other astrophysical applications. We show that this interpretation can be achieved through an improved first-principles method. Our calculation shows that the shift of K-edges exhibits selective sensitivity to thermal parameters and thus would be a suitable temperature index to warm dense plasmas. We also show with a simple model that the shift of K-edges can be used to detect inhomogeneity inside warm dense plasmas when combined with other experimental tools.

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