Improved calculation for ion configuration distribution from the average-atom model

Pei, Wenbing; Chang, Tieqiang

doi:10.1016/s0022-4073(98)00131-9

Cited by 5 publications

(3 citation statements)

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“…With the grand-canonical ensemble, one can calculate the probability distribution [73] of all possible bound-state configurations (see Appendix A for details),…”

Section: The Second Step: Fixed-configuration Calculationmentioning

confidence: 99%

Quantum-Mechanical Calculation of Ionization-Potential Lowering in Dense Plasmas

et al. 2014

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The charged environment within a dense plasma leads to the phenomenon of ionization potential depression (IPD) for ions embedded in the plasma. Accurate predictions of the IPD effect are of crucial importance for modeling atomic processes occurring within dense plasmas. Several theoretical models have been developed to describe the IPD effect, with frequently discrepant predictions. Only recently, first experiments on IPD in Al plasma have been performed with an x-ray free-electron laser (XFEL), where their results were found to be in disagreement with the widely-used IPD model by Stewart and Pyatt. Another experiment on Al, at the Orion laser, showed disagreement with the model by Ecker and Kröll. This controversy shows a strong need for a rigorous and consistent theoretical approach to calculate the IPD effect. Here we propose such an approach: a two-step Hartree-Fock-Slater model. With this parameter-free model we can accurately and efficiently describe the experimental Al data and validate the accuracy of standard IPD models. Our model can be a useful tool for calculating atomic properties within dense plasmas with wide-ranging applications to studies on warm dense matter, shock experiments, planetary science, inertial confinement fusion and studies of non-equilibrium plasmas created with XFELs.

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“…With the grand-canonical ensemble, one can calculate the probability distribution [73] of all possible bound-state configurations (see Appendix A for details),…”

Section: The Second Step: Fixed-configuration Calculationmentioning

confidence: 99%

Quantum-Mechanical Calculation of Ionization-Potential Lowering in Dense Plasmas

et al. 2014

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“…For the study of WDM, the distribution of ionic species and excited state populations need to be calculated. In cases where the number of configurations to be considered is large (for instance, for high Z plasmas), it turns difficult to accurately solve the relevant equations [3,4]. In these cases, an alternative approach is the average atom model (AAM).…”

Section: Introductionmentioning

confidence: 99%

An Implementation of the Average Atom Model using the Thermodynamic Consistency Condition: Application to Ar

Lanzini

Rocco

2018

Acta Phys. Pol. A

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We present a computational implementation of the average atom model for the calculation of matter properties under different conditions of density and temperature. Different issues related to the practical implementation, particularly those concerning the choice of an energy value acting as a boundary between free and bound electron states are discussed. As a test case, the ionization degree, electron density, and contributions to the potential V (r) are computed for Ar at temperatures ranging from a few eV to some keV, and ionic densities between 1 × 10 19 cm −3 and 1 × 10 23 cm −3. Results of the model are compared with those obtained by means of the Thomas-Fermi model and by other analytical approaches.

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“…Lawrence Livermore 国家实验室发展的 LASNEX 程序, 不但能够较好地对激光惯性约束聚变实验进行理论设计与分析, 还能研究激光等离子体辐射输运性质 [11] . 北京应用物理与计算数学所的研究组发展了平均原子 (AA) 等理论模型 [12] , 进行了 LTE 和 NLTE 条件下等离子体辐射不透明度的研究 [13] . 另外, 该研究所的段斌等人 [14] 基于对惯性约束聚变等离子体特征发射光谱及其辐射线形的规律研究, 分析了惯性约束聚变内爆实验的测量结果 [15] .…”

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Investigation of radiation dynamic properties in laser-produced silicon plasma

Qin

Cao

et al. 2016

Sci. Sin.-Phys. Mech. Astron.

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In this paper, the radiation characteristic of laser produced plasma in vacuum environment is studied from experiment and theory. Experimentally, the EUV emission spectrum of the Si plasma is measured by using the time-space resolved laser-produced plasma technique, and the spectrum is identified and analyzed. In order to explore the dynamic properties of the experimental spectra, a simplified radiation dynamic model, which can be used to investigate the radiation properties and dynamics evolution of the laser-produced plasma is established on the basis of the gas dynamic equations and the radiative transfer equation. By using this model, the time-space resolved spectrum is simulated and the temporal and spatial evolution characteristics of the plasma temperature and density as well as the various transient ions are investigated systematically. The results show that the presented radiation dynamic model can reflect the dynamical evolution process of the laser produced plasma and radiation characteristics of the emission spectra very well, and therefore it can be used as an effective tool in laser produced plasma diagnosis. laser-produced Si plasma, time-space resolved spectra, radiation dynamic model

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Improved calculation for ion configuration distribution from the average-atom model

Cited by 5 publications

References 0 publications

Quantum-Mechanical Calculation of Ionization-Potential Lowering in Dense Plasmas

Quantum-Mechanical Calculation of Ionization-Potential Lowering in Dense Plasmas

An Implementation of the Average Atom Model using the Thermodynamic Consistency Condition: Application to Ar

Investigation of radiation dynamic properties in laser-produced silicon plasma

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