Opacity measurements in a hot dense medium

Perry, T. S.; Davidson, Steven J.; Serduke, F. J. D.; Bach, Dieter; Smith, C.; Foster, J. M.; Doyas, R.J.; Ward, Richard A.; Iglesias, Carlos A.; Rogers, F. J.; Abdallah, J.; Stewart, R. E.; Kilkenny, J. D.; Lee, R.W.

doi:10.1103/physrevlett.67.3784

Cited by 197 publications

(51 citation statements)

References 13 publications

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“…This code uses a basis set of detailed LS terms including interactions with the plasma which are treated as perturbations. Discrepancies from 3% at 10 eV and 10~3 g cirT 3 , up to 60% at 20 eV and 10 _1 gcirT 3 are found.…”

Section: Spectrally Resolved and Mean Opacities Of Carbón Plasmas In mentioning

confidence: 95%

“…Effects of the reabsorption on plasma average ionization (Z), Planck (K P ) and Rosseland (KR) mean opacities (cm 2 /g) for several densities (gcrrr 3 ) and a fixed temperature of T=40 eV. at low temperatures is due to the fact that the máximum of the spectrally resolved opacity is approaching the máximum valué of the Planck and its first derivative functions.…”

Section: Tablementioning

confidence: 99%

“…where T is the temperature (eV) and p is the mass density (g cirr 3 ). The definition of the parameter a can change depending on the author.…”

Section: Nlte Analytical Mean Opacities For Carbón Plasmas In a Wide mentioning

confidence: 99%

“…In these plasmas the calculation of its radiative properties is a difficult task due to the huge number of levéis and transitions involved, even for low Z elements. In particular, the understanding of ICF plasmas requires emissivities and opacities for both hydro-simulations and diagnostics [2], During the last two decades, carbón and aluminum plasmas have been of particular interest for experimental and theoretical work [3][4][5][6], Most of this work was developed under LTE conditions, and since the calculation of plasma radiative properties is very complex, this is a welcome simplification. However, to assist in the calculation of such properties beyond the LTE assumption, the code ABAKO/RAPCAL has been developed [7][8][9], which can determine populations, radiative properties, spectrally resolve opacities and emissivities, and perform K-shell spectroscopic diagnostics to infer both the average electrón density and the temperature of the plasma in LTE and non-LTE (NLTE) regimes.…”

Section: Introductionmentioning

confidence: 99%

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Opacity calculation for target physics using the ABAKO/RAPCAL code

Mı́nguez

Florido

Rodríguez

et al. 2010

High Energy Density Physics

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Radiative properties of hot dense plasmas remain a subject of current interest since they play an important role in inertial confinement fusión (ICF) research, as well as in studies on stellar physics. In particular, the understanding of ICF plasmas requires emissivities and opacities for both hydro-simulations and diagnostics. Nevertheless, the accurate calculation of these properties is still an open question and continuous efforts are being made to develop new models and numerical codes that can facilítate the PACS' evaluation of such properties. In this work the set of atomic models ABAKO/RAPCAL is presented, as well as a series of results for carbón and aluminum to show its capability for modeling the population kinetics Keywords:of plasmas in both LTE and NLTE regimes. AIso, the spectroscopic diagnostics of a laser-produced Opacities aluminum plasma using ABAKO/RAPCAL is discussed. Additionally, as an interesting application of these Emissivities codes, fitting analytical formulas for Rosseland and Planck mean opacities for carbón plasmas are Population kinetics reported. These formulas are useful as input data in hydrodynamic simulation of targets where the computation task is so hard that in line computation with sophisticated opacity codes is prohibitive.

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Section: Spectrally Resolved and Mean Opacities Of Carbón Plasmas In mentioning

confidence: 95%

Section: Tablementioning

confidence: 99%

“…where T is the temperature (eV) and p is the mass density (g cirr 3 ). The definition of the parameter a can change depending on the author.…”

Section: Nlte Analytical Mean Opacities For Carbón Plasmas In a Wide mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Opacity calculation for target physics using the ABAKO/RAPCAL code

Mı́nguez

Florido

Rodríguez

et al. 2010

High Energy Density Physics

View full text Add to dashboard Cite

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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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Lipoic acid increases de novo synthesis of cellular glutathione by improving cystine utilization

et al. 1997

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Lipoic acid (thiotic acid) is being used as a dietary supplement, and as a therapeutic agent, and is reported to have beneficial effects in disorders associated with oxidative stress, but its mechanism of action remains unclear. We present evidence that lipoic acid induces a substantial increase in cellular reduced glutathione in cultured human Jurkat T cells human erythrocytes, C6 glial cells, NB41A3 neuroblastoma cells, and peripheral blood lymphocytes. The effect depends on metabolic reduction of lipoic acid to dihydrolipoic acid. Dihydrolipoic acid is released into the culture medium where it reduces cystine. Cysteine thus formed is readily taken up by the neutral amino acid transport system and utilized for glutathione synthesis. By this mechanism lipoic acid enables cystine to bypass the xc- transport system, which is weakly expressed in lymphocytes and inhibited by glutamate. Thereby lipoic acid enables the key enzyme of glutathione synthesis, gamma-glutamylcysteine synthetase, which is regulated by uptake-limited cysteine supply, to work at optimum conditions. Flow cytometric analysis of freshly prepared human peripheral blood lymphocytes, using monobromobimane labeling of cellular thiols, reveals that lipoic acid acts mainly to normalize a subpopulation of cells severely compromised in thiol status rather than to increase thiol content beyond physiological levels. Hence lipoic acid may have clinical relevance in restoration of severely glutathione deficient cells.

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Opacity measurements in a hot dense medium

Cited by 197 publications

References 13 publications

Opacity calculation for target physics using the ABAKO/RAPCAL code

Opacity calculation for target physics using the ABAKO/RAPCAL code

Opacity Measurement and Theoretical Investigation of Hot Silicon Plasma

Lipoic acid increases de novo synthesis of cellular glutathione by improving cystine utilization

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