NLTE材料性能制表的能带法

IF 1.6 3区物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS

High Energy Density Physics Pub Date : 2022-06-01 DOI:10.1016/j.hedp.2022.100998

Yechiel Frank, Howard A. Scott

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引用次数: 2

摘要

在辐射流体动力学模拟中使用非局部热平衡(NLTE)材料特性仍然是一个主要挑战。NLTE中的等离子体辐射和EOS特性取决于详细的局部辐射场和电子能量分布。充分表征这些数量中的每一个可能需要10到100个参数，这使得制表实际上是不可能的，并且需要对模拟中的每一组条件进行昂贵的计算。在这项工作中，我们提出了一种用有限数量的参数来表征局部辐射场的新方法。这允许预先计算和材料特性制表，允许代码执行NLTE辐射-流体动力学模拟，否则计算是禁止的。

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The bands method for tabulating NLTE material properties

The use of Non-Local Thermal Equilibrium (NLTE) material properties within radiation-hydrodynamic simulations remains a major challenge. The plasma radiative and EOS properties in NLTE can depend on the detailed local radiation field and electron energy distribution. Fully characterizing each of these quantities may require 10’s to 100’s of parameters, making tabulation effectively impossible and requiring expensive calculations for each set of conditions within the simulation. In this work we present a new method that characterizes the local radiation field with a limited number of parameters. This permits pre-calculation and tabulation of the material properties, allowing codes to perform NLTE radiation-hydrodynamic simulations which would otherwise be computationally prohibitive.

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来源期刊

High Energy Density Physics PHYSICS, FLUIDS & PLASMAS-

CiteScore

4.20

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： High Energy Density Physics is an international journal covering original experimental and related theoretical work studying the physics of matter and radiation under extreme conditions. ''High energy density'' is understood to be an energy density exceeding about 1011 J/m3. The editors and the publisher are committed to provide this fast-growing community with a dedicated high quality channel to distribute their original findings. Papers suitable for publication in this journal cover topics in both the warm and hot dense matter regimes, such as laboratory studies relevant to non-LTE kinetics at extreme conditions, planetary interiors, astrophysical phenomena, inertial fusion and includes studies of, for example, material properties and both stable and unstable hydrodynamics. Developments in associated theoretical areas, for example the modelling of strongly coupled, partially degenerate and relativistic plasmas, are also covered.