Spectroscopic absorption measurements of an iron plasma

Springer, P. T.; Fields, D. J.; Wilson, B. G.; Nash, J. K.; Goldstein, W. H.; Iglesias, Carlos A.; Rogers, F. J.; Swenson, J.K.; Chen, M. H.; Bar‐Shalom, A.; Stewart, Richard E.

doi:10.1103/physrevlett.69.3735

Cited by 152 publications

(69 citation statements)

References 13 publications

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“…In order to test mixtures calculations we have included in figure 3 the transmission coefficient for a mixture of iron with sodium fluoride compared with the experimental data described in [11]. Conditions determined were 59 eV and 11.3 mg/cm 3 .…”

Section: Comparison To Experimental Datamentioning

confidence: 99%

Equation of state and opacities for warm dense matter

Cotelo¹,

laVarga²,

Velarde

et al. 2013

EPJ Web of Conferences

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Abstract. This work presents recent developments in the calculation of opacity and equation of state tables suitable for including in the radiation hydrodynamic code ARWEN [1] to study processes like ICF or X-ray secondary sources. For these calculations we use the code bigbart to compute opacities in LTE conditions, with self-consistent data generated with the Flexible Atomic Code (FAC) [2]. Non-LTE effects are approximately taken into account by means of the new RADIOM model developed in [3], which makes use of existing LTE data tables. We use the screened-hydrogenic model [4] to derive the Equation of State (EOS) using the population and energy of each level.

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Section: Comparison To Experimental Datamentioning

confidence: 99%

Equation of state and opacities for warm dense matter

Cotelo¹,

laVarga²,

Velarde

et al. 2013

EPJ Web of Conferences

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show abstract

“…The xenon pressure was measured for each experiment, and was 1.1 (± 10%) atm. for the cases of interest here corresponding to ρ ο = 6 mg/cm 3 or to 2.7 x 10 19 atoms/cm 3 . The drive disks were nominally 10 µm, 20 µm or 40 µm of Be, individually measured.…”

Section: B Recent Research In Radiative Shocksmentioning

confidence: 99%

Annual Report 2006 for Hydrodynamics and Radiation Hydrodynamics with Astrophysical Applications

Drake¹

2007

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Target for a supernova hydrodynamics experiment. The large acrylic shield has several advantages.Dual orthogonal backlit pinhole radiographs using ungated detectors. From experiments to study Rayleigh-Taylor evolution from a 3D sinusoidal pattern, at 21 ns. Left: an image across the CHBr strip. Right: an image down the CHBr strip. In both images dense spikes and the shockwave can be seen. They are moving to the right. The grid is for spatial calibration and magnification. The bright white feature on the left is a scratch on the film. Radiograph, of radiative shock in Xe gas after image processing to remove x-ray intensity variations.

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“…17 A table of opacities at discrete densities and temperatures was compiled and used as the primary theoretical spectral data in our analysis. The temperature and density were logarithmically spaced on the intervals 1−100 eV and 0.00027−2.7 g/cm 3 , respectively. Two points per decade were used in density, giving 9 points total.…”

Section: Fitting Synthetic Spectramentioning

confidence: 99%

“…Additionally, uniformity of the plasma is desired along the dimension perpendicular to the absorption path that will be parallel to the dispersion axis of the spectrometer. This has been accomplished in the past by constraining the sample, [1][2][3][4] heating it isochorically and probing it before it has time to expand, 5,6 or by probing an area smaller than the gradient length scales. 7,8 These techniques have been used successfully to diagnose conditions in laser produced, shock heated and x-ray heated plasmas.…”

Section: Introductionmentioning

confidence: 99%

Calibration and analysis of spatially resolved x-ray absorption spectra from a nonuniform plasma

Knapp

Hansen

Pikuz

et al. 2012

Review of Scientific Instruments

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We report here the calibration and analysis techniques used to obtain spatially resolved density and temperature measurements of a pair of imploding aluminum wires from x-ray absorption spectra. A step wedge is used to measure backlighter fluence at the film, allowing transmission through the sample to be measured with an accuracy of ±14% or better. A genetic algorithm is used to search the allowed plasma parameter space and fit synthetic spectra with 20 μm spatial resolution to the measured spectra, taking into account that the object plasma nonuniformity must be physically reasonable. The inferred plasma conditions must be allowed to vary along the absorption path in order to obtain a fit to the spectral data. The temperature is estimated to be accurate to within ±25% and the density to within a factor of two. This information is used to construct two-dimensional maps of the density and temperature of the object plasma.

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Spectroscopic absorption measurements of an iron plasma

Cited by 152 publications

References 13 publications

Equation of state and opacities for warm dense matter

Equation of state and opacities for warm dense matter

Annual Report 2006 for Hydrodynamics and Radiation Hydrodynamics with Astrophysical Applications

Calibration and analysis of spatially resolved x-ray absorption spectra from a nonuniform plasma

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