Linear response of a variational average atom in plasma: Semi-classical model

被引:5
作者
Caizergues, C. [1 ]
Blenski, T. [1 ]
Piron, R. [2 ]
机构
[1] CEA Saclay, IRAMIS, Lab Interact Dynam & Lasers, Ctr Etud Saclay, F-91191 Gif Sur Yvette, France
[2] CEA, DIF, F-91297 Arpajon, France
关键词
Thomas-Fermi average-atom; Bloch hydrodynamics; Frequency-dependent linear response; Ehrenfest-type sum rule; Bremsstrahlung; Collective effects in plasmas; BLOCHS HYDRODYNAMIC MODEL; ELECTRON-ION PLASMA; DENSE-PLASMAS; PHOTOABSORPTION; METALS; TEMPERATURE; MATTER;
D O I
10.1016/j.hedp.2014.04.004
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The frequency-dependent linear response of a plasma is studied in the finite-temperature Thomas-Fermi approximation, with electron dynamics described using Bloch hydrodynamics. The variational framework of average-atoms in a plasma is used. Extinction cross-sections are calculated for several plasma conditions. Comparisons with a previously studied Thomas-Fermi Impurity in Jellium model are presented. An Ehrenfest-type sum rule, originally proposed in a full quantum approach is derived in the present formalism and checked numerically. This sum rule is used to define Bremsstrahlung and collective contributions to the extinction cross-section. It is shown that none of these is negligible. Each can constitute the main contribution to the cross-section, depending on the frequency region and plasma conditions. This result obtained in the Thomas-Fermi-Bloch case stresses the importance of the self-consistent approach to the linear response in general. Some of the methods used in this study can be extended to the linear response in the quantum case. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:12 / 20
页数:9
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