Calculations of the radiative opacity of laser-produced plasmas

Rose, S. J.

doi:10.1088/0953-4075/25/7/034

Cited by 169 publications

(75 citation statements)

References 23 publications

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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 Calculationssupporting

confidence: 51%

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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Section: Theoretical Calculationssupporting

confidence: 51%

Opacity Measurement and Theoretical Investigation of Hot Silicon Plasma

Xiong

Yang

Zhang

et al. 2015

ApJ

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“…Dense plasmas in the warm-dense matter (WDM) regime, approximately solid density and tens of eV temperature, are of great interest as a probe of stopping-power theories, with broader physics relevance to nonequilibrium statistical mechanics [1], dense plasma transport properties [2][3][4], and bound-free transitions in WDM plasmas [5]. Accurate theory for bound-free transitions is required to interpret data obtained with common laser-plasma diagnostics including Thomson scattering [6] and opacity-based areal density techniques [7].…”

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confidence: 99%

Measurement of Charged-Particle Stopping in Warm Dense Plasma

et al. 2015

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We measured the stopping of energetic protons in an isochorically heated solid-density Be plasma with an electron temperature of ∼32 eV, corresponding to moderately coupled ½ðe 2 =aÞ=ðk B T e þ E F Þ ∼ 0.3 and moderately degenerate ½k B T e =E F ∼ 2 "warm-dense matter" (WDM) conditions. We present the first highaccuracy measurements of charged-particle energy loss through dense plasma, which shows an increased loss relative to cold matter, consistent with a reduced mean ionization potential. The data agree with stopping models based on an ad hoc treatment of free and bound electrons, as well as the average-atom local-density approximation; this work is the first test of these theories in WDM plasma.

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“…By postprocessing the simulation output using opacity data from the IMP (Ionised Materials Package) code [19]; the transmission at the Al K α wavelength through the Fe layer was calculated.…”

Section: Simulation Resultsmentioning

confidence: 99%

X-ray back-lighter characterization for iron opacity measurements using laser-produced aluminium K-alpha emission

Rossall

Gartside

Chaurasia

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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Aluminium K α emission (1.5 keV) produced by an 8 J, 500 ps, Nd:Glass laser incident at 45° onto a layered target of 0.8 µm thick aluminium (front side) and 1µm thick iron (back side) has been used to probe the opacity of iron plasma. Source broadened spectroscopy and continuum emission analysis shows that whole beam self focussing within the aluminium plasma results in a two temperature spatial distribution. Thermal conduction from the laser-irradiated aluminium into the iron layer, enhanced by the whole beam self focusing, results in iron at a temperature of ~ 10 -150 eV. The iron opacity at photon energy of 1.5 keV is shown to be strongly modified from cold values in agreement with IMP code opacities. Results presented here represent a feasibility study to seed future work using table top laser systems for plasma opacity experiments.

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Calculations of the radiative opacity of laser-produced plasmas

Cited by 169 publications

References 23 publications

Opacity Measurement and Theoretical Investigation of Hot Silicon Plasma

Opacity Measurement and Theoretical Investigation of Hot Silicon Plasma

Measurement of Charged-Particle Stopping in Warm Dense Plasma

X-ray back-lighter characterization for iron opacity measurements using laser-produced aluminium K-alpha emission

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