Measurement of the extreme UV opacity of a hot dense gold plasma

Eidmann, K.; Bar‐Shalom, A.; Saemann, A.; Winhart, G.

doi:10.1209/epl/i1998-00494-8

Cited by 24 publications

(21 citation statements)

References 17 publications

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“…For mid-and high-Z elements, however, there are systematic discrepancies unexplained so far [24][25][26]. Are these discrepancies caused by theoretical approximations or experimental uncertainties ?…”

Section: Radiative Opacity Of Au Plasmasmentioning

confidence: 99%

“…So far, some researches have been carried out on the opacity of Au plasmas, both experimentally and theoretically. Eidmann et al [25] measured the opacity of a Au plasma at a density of ~ 0.01 g ⋅ cm −3 and temperature of~20 eV in a photon energy range of 50 to 300 eV. By mixing appropriate elements with Au, Orzechowski et al [67] experimentally demonstrated the increase of Rosseland mean opacity, which is 1.5 times higher than either of the constituents.…”

Section: Radiative Opacity Of Au Plasmasmentioning

confidence: 99%

“…However, for the radiative opacity of mid-and high-Z elements, there are unexplained systematic discrepancies between the theory and experiment so far (for example, see [24][25][26]). Perry et al [24] experimentally measured the inner-shell X-ray absorption by a germanium plasma.…”

Section: Introductionmentioning

confidence: 99%

“…However, the discrepancy is still not eliminated. Eidmann et al [25] measured the opacity of a Au plasma at a density of ~ 0.01 g cm ⋅ −3 and temperature of ~ 20 eV in photon energy range of 50 to 300 eV. They also used the STA model to interpret the experimental spectra, yet the STA model predicted reversed intensity for the two strongest absorption peaks.…”

Section: Introductionmentioning

confidence: 99%

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

2006

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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-transitionarray 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 viewpoint 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].

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Section: Radiative Opacity Of Au Plasmasmentioning

confidence: 99%

Section: Radiative Opacity Of Au Plasmasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2006

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“…Due to its importance in astrophysics, experimental data on the opacity of iron are extensive (Da Silva et al 1992;Springer et al 1992Springer et al , 1997Winhart et al 1995Winhart et al , 1996Chenais-Popovics et al 2000;Zhang et al 2012). Apart from iron, the opacities of low-Z (Perry et al 1991(Perry et al , 2000Yang et al 2002Yang et al , 2003Zhang et al 2007) and high-Z elements (Eidmann et al 1998;Zhang et al 2011) have also been measured in laboratories. However, the amount of laboratory measurements concerning the opacity of silicon is very limited.…”

Section: Introductionmentioning

confidence: 99%

Opacity Measurement and Theoretical Investigation of Hot Silicon Plasma

Xiong

Yang

Zhang

et al. 2015

ApJ

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We report on opacity measurements of a silicon (Si) plasma at a temperature of (72 ± 5) eV and a density of (6.0 ± 1.2) mg cm −3 in the photon energy range of 1790-1880 eV. A 23 μg cm −2 Si foil tamped by 50 μg cm −2 CH layers on each side was heated to a hot-dense plasma state by X-ray radiation emitted from a D-shaped gold cavity that was irradiated by intense lasers. Absorption lines of 1s − 2p transitions of Si XIII to Si IX ions have been measured using point-projection spectroscopy. The transmission spectrum of the silicon plasma was determined by comparing the light passing through the plasma to the light from the same shot passing by the plasma. The density of the Si plasma was determined experimentally by side-on radiography and the temperature was estimated from the radiation flux data. Radiative hydrodynamic simulations were performed to obtain the temporal evolutions of the density and temperature of the Si plasma. The experimentally obtained transmission spectra of the Si sample plasma have been reproduced using a detailed term account model with the local thermodynamic equilibrium approximation. The energy levels, oscillator strengths and photoionization cross-sections used in the calculation were generated by the flexible atomic code. The experimental transmission spectrum was compared with the theoretical calculation and good agreement was found. The present experimental spectrum and theoretical calculation were also compared with the new opacities available in the Los Alamos OPLIB database.

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