The effect of unresolved transition arrays on plasma opacity calculations

Gaffney, Jim; Rose, S. J.

doi:10.1016/j.hedp.2011.05.003

Cited by 4 publications

(4 citation statements)

References 29 publications

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“…That these different EoS models give results which only differ on the 5% level gives confidence that the uncertainty in the EoS is not large enough to compromise the experiments. However, more work is needed to better understand the equation of state differences between codes and further work is underway using the OPENSESAME suite and particle swarm fitting methods [26,27] for a range of equation of state calculations and measurements.…”

Section: Predicted Results and Modellingmentioning

confidence: 99%

A proposal to measure iron opacity at conditions close to the solar convective zone-radiative zone boundary

Hoarty

Morton

Jeffery

et al. 2019

High Energy Density Physics

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Section: Predicted Results and Modellingmentioning

confidence: 99%

A proposal to measure iron opacity at conditions close to the solar convective zone-radiative zone boundary

Hoarty

Morton

Jeffery

et al. 2019

High Energy Density Physics

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“…Indeed, a one-electron jump from an orbital (n ) gives rise to a transition array which can be detailed or not. In order to decide whether a line-by-line calculation is necessary and to determine the validity of statistical methods, it can be interesting to quantify the porosity (localized absence of lines) of transition arrays [38,39]. In SCO-RCG, the most limiting parameter is the maximum number of lines per transition array allowed by the user.…”

Section: Previous Approach Used In Sco-rcgmentioning

confidence: 99%

Accounting for highly excited states in detailed opacity calculations

Pain

Gilleron

2015

High Energy Density Physics

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In multiply-charged ion plasmas, a significant number of electrons may occupy high-energy orbitals. These "Rydberg" electrons, when they act as spectators, are responsible for a number of satellites of X-ray absorption or emission lines, yielding a broadening of the red wing of the resonance lines. The contribution of such satellite lines may be important, because of the high degeneracy of the relevant excited configurations which give these large Boltzmann weights. However, it is in general difficult to take these configurations into account since they are likely to give rise to a large number of lines. We propose to model the perturbation induced by the spectators in a way similar to the PartiallyResolved-Transition-Array approach recently published by C. Iglesias. It consists in a partial detailedline-accounting calculation in which the effect of the Rydberg spectators is included through a shift and width, expressed in terms of the canonical partition functions, which are key-ingredients of the SuperTransition-Arrays model. The resulting method can a priori be used in any detailed-configuration/lineaccounting opacity code.

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“…Yet the peak absorption cross section without considering the AI resonance broadening is just 2.43 times larger than that which includes this effect. This is due to many lines overlapped together resulting in less pronounced for the effect of AI resonance broadening than in 14 …”

Section: Gementioning

confidence: 99%

“…With the development of computational ability, computation of plasma opacities is developing toward more accurate direction including DLA, mixed DLA and UTA and improvement of UTA [12][13][14]. In this work, we investigated the radiative opacity of Ge plasmas by using a detailed level accounting (DLA) approach.…”

Section: Introductionmentioning

confidence: 99%

Detailed Theoretical Investigations on the L-Shell Absorption of Open-M-Shell Germanium Plasmas:Effect of Autoionization Resonance Broadening

Xiang¹,

Zeng²,

Fu³

et al. 2012

JMP

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Radiative opacity of open-M-shell germanium plasmas in the L-shell photon energy region were investigated in detail by using a fully relativistic detailed level accounting approach. Among other physical effects such as relativistic and the interaction between fine-structure levels belonging to the same non-relativistic configuration and different configurations, particular attention is paid on the effect of autoionization resonance broadening on the L-shell absorption. The results show that for plasmas at present and past typical experimental conditions, line width due to autoionization resonance broadening dominate among all the physical broadening mechanisms including electron impact and Doppler broadenings. Such an effect is most pronounced for ions with just a few 2p-nd transition lines such as , while it is not so pronounced for complex ions such as Ge , where there are so many 2p-nd lines that line overlapping partly conceal the effect of autoionization resonance broadening. After taking the effect of autoionization resonance broadening into account, detailed comparisons are made with available experimental spectra at different physical conditions of different plasma temperatures and densities. The L-shell absorption is sensitive to the plasma temperature, especially in the 2p-3d excitation energy region. The potential of utlizing the relative shape and intensity of the 2p-3d spin-orbit splitting as temperature diagnostics is investigated.

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The effect of unresolved transition arrays on plasma opacity calculations

Cited by 4 publications

References 29 publications

A proposal to measure iron opacity at conditions close to the solar convective zone-radiative zone boundary

A proposal to measure iron opacity at conditions close to the solar convective zone-radiative zone boundary

Accounting for highly excited states in detailed opacity calculations

Detailed Theoretical Investigations on the L-Shell Absorption of Open-M-Shell Germanium Plasmas:Effect of Autoionization Resonance Broadening

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