L- and M-shell absorption measurements of radiatively heated Fe plasma

Zhang, Jiyan; Li, Hang; Zhao, Yang; Xiong, Gang; Yuan, Zheng; Zhang, Haiying; Gao, Yang; Yang, Jiamin; Liu, Shenye; Jiang, Shaoen; Ding, Yongkun; Zhang, Baohan; Zhi-Jian, Zheng; Yan, Xu; Meng, Xin-He; Yan, Jiangli

doi:10.1063/1.4769103

Cited by 24 publications

(19 citation statements)

References 32 publications

(27 reference statements)

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“…Although the agreement between our ATOMIC calculations and the measured data is reasonable, possible contamination of the measured transmission by self-emission makes a detailed comparison difficult. More recent measurements were made from a Fe plasma at a temperature of around 72 eV [35]. A broad photon energy range was measured (150e1200 eV), and it appears that our ATOMIC calculations are in good agreement with the measured transmission.…”

Section: Comparison With Opacity Measurementssupporting

confidence: 67%

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Light element opacities of astrophysical interest from ATOMIC

Colgan

Kilcrease

Magee

et al. 2015

High Energy Density Physics

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a b s t r a c tWe report on our continued work to produce a new set of local-thermodynamic-equilibrium (LTE) opacity tables using the Los Alamos ATOMIC code. OPLIB tables for the 30 elements from H through Zn are almost complete and are expected to be available in 2015. In this paper we present some examples of our new opacities from ATOMIC. We provide comparisons of our opacities with a series of opacity measurements that were performed on Fe and Al some years ago. We also present opacities at conditions of interest to stellar modeling and compare and contrast the opacity of various transition metals with OP calculations that are commonly used in astrophysical modeling.

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Section: Comparison With Opacity Measurementssupporting

confidence: 67%

“…We end this section by noting several other measurements of Fe transmission spectra [34,35]. The measurements of Ref.…”

Section: Comparison With Opacity Measurementsmentioning

confidence: 99%

Light element opacities of astrophysical interest from ATOMIC

Colgan

Kilcrease

Magee

et al. 2015

High Energy Density Physics

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“…For iron, the plasma temperatures are around 20 eV in early opacity experiments using large laser facilities (Da silva et al 1992;Winhart et al 1995Winhart et al , 1996ChenaisPopovics et al 2000). In experiments by Springer et al (1992) and Zhang et al (2012), they measured temperatures up to 50 to 76 eV. Very recently, Bailey et al (2007Bailey et al ( , 2015 made a break through in the temperature (150 to 210 eV) and density (up to …”

Section: Resultsmentioning

confidence: 99%

Effects of lowly ionized ions on silicon K-shell absorption spectra

Wei

Shi

Liang

et al. 2016

A&A

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Context. In both astrophysical and laboratory plasmas, K-shell absorption spectra have become powerful diagnostic tools to investigate electron density and temperature. These spectra are also widely used to verify the opacity codes in laboratory settings. Aims. We report the effects of the low ionization silicon ions, namely from Si I to Si V, which have rarely been considered in previous models, on the K-shell silicon absorption spectra. Methods. The Si K-shell atomic data were calculated with the flexible atomic code, which is a fully relativistic atomic program with configuration interaction taken into consideration. Detailed level accounting models were employed to calculate the absorption spectra. Results. We calculate the Si absorption spectra in local thermodynamic equilibrium conditions with temperature and density ranges of 20−70 eV and ∼10 20 cm −3 to ∼10 22 cm −3 , respectively, and show the contributions of the lowly ionized ions to the K-shell absorption spectra of silicon. We also investigate the effects of the different atomic data on the absorption spectra. We find good agreement between our results and these from OPLIB. Conclusions. We find that the contributions from these lowly ionized ions cannot be neglected at relative low temperatures. Accurate experimental measurements are needed to benchmark the theoretical calculations.

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“…In the past years, we have calculated the opacities using the DCA model (Rose 1992;Yan & Qiu 2001) for hot Au and Fe plasmas, which show great agreements with the experimental spectra (Zhang et al 2011(Zhang et al , 2012. Although the DCA model is useful for calculating the opacity for high-Z and middle-Z plasmas, the DCA model is not suitable for the transmission spectrum with a higher resolution of low-Z plasmas, such as is the case in the present work.…”

Section: Theoretical Calculationsmentioning

confidence: 99%

“…High power laser facilities present the first chance to measure the radiative opacities of hot-dense plasmas in a controlled laboratory environment. 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.…”

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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L- and M-shell absorption measurements of radiatively heated Fe plasma

Cited by 24 publications

References 32 publications

Light element opacities of astrophysical interest from ATOMIC

Light element opacities of astrophysical interest from ATOMIC

Effects of lowly ionized ions on silicon K-shell absorption spectra

Opacity Measurement and Theoretical Investigation of Hot Silicon Plasma

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