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Radiative opacity of plasmas studied by detailed term (level) accounting approaches

Content Provider	Springer Nature Link
Author	Zeng, Jiao long Jin, Feng tao Yuan, Jian min
Copyright Year	2006
Abstract	Detailed term and level accounting (DTA and DLA) schemes have been developed to calculate the spectrally resolved and Rosseland and Planck mean opacities of plasmas in local thermodynamic equilibrium. Various physical effects, such as configuration interaction effect (including core-valence electron correlations effect and relativistic effect), detailed line width effect (including the line saturation effect), etc., on the opacity of plasmas have been investigated in detail. Some of these physical effects are less capable or even impossible to be taken into account by statistical models such as unresolved transition arrays, super-transition-array or average atom models. Our detailed model can obtain accurate opacity of plasmas. Using this model, we have systematically investigated the radiative opacities of low, medium and high-Z plasmas under different conditions of temperature and density. For example, for aluminum plasma, in the X-ray region, we demonstrated the effects of autoionization resonance broadening on the opacity for the first time. Furthermore, the relativistic effects play an important role on the opacity as well. Our results are in good agreement with other theoretical ones although better agreement can be obtained after the effects of autoionization resonance broadening and relativity have been considered. Our results also show that the modelling of the opacity is very complicated, since too many physical effects influence the accuracy of opacity.For medium and high-Z plasmas, however, there are systematic discrepancies unexplained so far between the theoretical and experimental opacities. Here, the theoretical opacities are mainly obtained by statistical models. To clarify the discrepancies, efforts from both sides are needed. From the view-point of theory, however, a DLA method, in which various physical effects can be taken into account, should be useful in resolving the difference. Taking gold plasma as an example, we studied in detail the effects of core-valence electron correlation and line width on the opacity. Our DLA results correctly explained, for the first time, the relative intensity of the two strong absorption peaks located near the photon energy of 70 and 80 eV, which was experimentally observed by Eidmann et al. [Europhys. Lett., 1998, 44: 459].
Starting Page	468
Ending Page	489
Page Count	22
File Format	PDF
ISSN	16733487
Journal	Frontiers of Physics
Volume Number	1
Issue Number	4
e-ISSN	16733606
Language	English
Publisher	Higher Education Press
Publisher Date	2006-01-01
Publisher Institution	Chinese Universities
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	radiative opacity plasma detailed term (level) accounting Plasma heating by DC fields; ohmic heating, arcs Elementary processes in plasmas Auger effect Physics
Content Type	Text
Resource Type	Article
Subject	3100/3101

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Radiative opacity of plasmas studied by detailed term (level) accounting approaches

Radiative opacity of gold plasmas studied by a detailed level-accounting method.

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Detailed-term-accounting-approximation calculations of the radiative opacity of laser-produced Al plasmas.

Detailed-term-accounting approximation calculations of the radiative opacity of aluminum plasmas: a systematic study.

Radiative opacity of plasmas studied by detailed term (level) accounting approaches

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