Analysis of the influence of the plasma thermodynamic regime in the spectrally resolved and mean radiative opacity calculations of carbon plasmas in a wide range of density and temperature

Gil, Juan; Rodríguez, Rafael; Martel, P.; Florido, R.; Rubiano, J.G.; Mendoza, M.A.; Mı́nguez, E.

doi:10.1016/j.jqsrt.2012.05.016

Cited by 7 publications

(2 citation statements)

References 41 publications

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“…Thus, in a previous work, we studied the plasma thermodynamic regimes of optically thin steady-state carbon plasmas [64] in the range of electron temperatures and densities of 1-1000 eV and 10 10 -10 22 cm −3 , respectively, and their influence in the determination of the radiative properties. Our simulations for the monochromatic, multigroup, and mean opacities [65] and the average ionization and cooling rates [13] were also tested. For aluminum plasmas, we determined the plasma thermodynamic regimes as a function of plasma conditions and checked our simulations for the average ionization, CSDs, mean opacities, and monochromatic opacities and emissivities with other LTE and NLTE simulations [57,66].…”

Section: A Comparison With Nonlocal Thermodynamic Equilibrium Codesmentioning

confidence: 99%

Radiative properties for astrophysical plasma mixtures in nonlocal thermodynamic equilibrium

2018

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Radiative properties play a pivotal role in astrophysical plasma flows and are needed in radiationhydrodynamic simulations in order to understand their behavior and also to interpret the plasma emission spectra, which are valuable diagnostic tools. Radiative properties of astrophysical plasma mixtures have been commonly calculated for low-density optically thin plasmas assuming coronal equilibrium and for high density assuming local thermodynamic equilibrium. However, there are wide ranges of conditions in which these thermodynamic regimes are not achieved and the plasma is in the nonlocal thermodynamic equilibrium regime. In the present work, a study of the plasma radiative properties of oxygen and iron and an astrophysical plasma mixture in nonlocal thermodynamic steady-state equilibrium is carried out. The ranges of electron temperatures and densities considered are 1-1000 eV and 10 11-10 20 cm −3 , respectively. In the study, departures from coronal and local thermodynamic equilibria in terms of the density and temperature are also analyzed. Large differences in the radiative properties that can reach two orders of magnitude when the plasma is far from these thermodynamic regimes are obtained. These analyses are done assuming the plasma to be optically thin. A brief study of the influence of the plasma self-absorption in the radiative properties of oxygen and iron is made. For that purpose, the plasma is assumed with planar geometry and the study is performed in terms of the width of the plasma slab and electron temperature and density.

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Section: A Comparison With Nonlocal Thermodynamic Equilibrium Codesmentioning

confidence: 99%

Radiative properties for astrophysical plasma mixtures in nonlocal thermodynamic equilibrium

2018

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“…In this section can be found a gross summary of the average atom models evolution according to the progressive treatment of bound and free electrons in the ion-sphere model and according also to the quantum numbers with respect to splitting of the matter structure, of first generation with n-splitting (NOHEL, XSN [8]), of second generation with nl-splitting [10][11][12][13] and of third generation with nlj-splitting (THERMOS, ATMED LTE & CR, OPAQS, …) [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. Highlighting some formulas, it can be noticed the long-term maintained evolution of atomic codes considering the average atom as a statistical item of energy configuration levels (ground state of minimum energy, single excited, doubly excited, autoionizing level, etc.…”

Section: Average Atom Models Evolution and Generationsmentioning

confidence: 99%

Comparison of Iron Plasma Atomic and Radiative Properties Computed with a Relativistic Collisional Radiative Average Atom Code versus Other Models

Benita

2018

AJR2P

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In this paper, it is presented a representative sample of steady state iron plasmas focusing the attention on two issues. First, the huge computation capability extension up to millions of plasmas with the implementation of a collisional radiative balance in the relativistic average atom model ATMED. Second, it will be addressed the good agreement of atomic and radiative properties not only with respect to very recent experimental measurements of laboratories and High Energy Density facilities, but also to the last theoretical developments in quantum mechanics of statistical methods, as new codes based on the self consistent Hartree-Fock-Slater model for the average atom which in turn solve the Schrödinger’s or Dirac’s equations of radial wave functions. The new codes have been validated with some state of the art models as OPAL, SCO-RCG, STA, CASSANDRA, LEDCOP, THERMOS, etc. The results for plasma properties can be considered as relatively precise and optimal, being checked fundamentally the high sensitivity of calculations to changes in regime, local thermodynamic equilibrium (LTE) or non-LTE (NLTE), electronic and radiation temperatures, dilution factor, matter or electronic density and plasma length. The systematic theoretical investigation is carried out through comparison of calculations performed with a wide set of atomic collisional radiative codes with detailed configurations or codes of the average atom formalism. Some transmissions computed with ATMED CR using UTA (Unresolved Transition Array) formalism are also checked with respect to very recent experimental measurements of laboratories.

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Feed forward neural network parametrization of the mean radiative properties of the mixture

Sun

Yan

Yao

et al. 2023

Journal of Quantitative Spectroscopy and Radiative Transfer

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Analysis of the influence of the plasma thermodynamic regime in the spectrally resolved and mean radiative opacity calculations of carbon plasmas in a wide range of density and temperature

Cited by 7 publications

References 41 publications

Radiative properties for astrophysical plasma mixtures in nonlocal thermodynamic equilibrium

Radiative properties for astrophysical plasma mixtures in nonlocal thermodynamic equilibrium

Comparison of Iron Plasma Atomic and Radiative Properties Computed with a Relativistic Collisional Radiative Average Atom Code versus Other Models

Feed forward neural network parametrization of the mean radiative properties of the mixture

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