X-ray opacity measurements in mid-Z dense plasmas with a new target design of indirect heating

Dozières, Maylis; Thais, F.; Bastiani-Ceccotti, S.; Błeński, T.; Fariaut, J.; Fölsner, W.; Gilleron, F.; Khaghani, Dimitri; Pain, Jean‐Christophe; Reverdin, C.; Rosmej, F. B.; Silvert, V.; Soullié, G.; Villette, B.

doi:10.1016/j.hedp.2015.08.001

Cited by 10 publications

(29 citation statements)

References 23 publications

(19 reference statements)

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“…The ratio between the two main structures (2p 1/2 → 3d 3/2 and 2p 3/2 → 3d 5/2 ) is highly sensitive to relativistic configuration interaction (i.e., Coulomb interaction between relativistic subconfigurations of a non-relativistic configuration). [30]. Comparison between experiment and our SCO-RCG calculation at T = 27 eV and ρ = 0.01 g/cm 3 .…”

Section: Interpretation Of Experimentsmentioning

confidence: 99%

“…X-ray transmission spectrum of copper was measured at "Laboratoire d'Utilisation des Lasers Intenses" (LULI) in France at the LULI2000 laser facility with an improved design of indirect heating [30]. The sample is a thin foil of mid-Z material inserted between two gold cavities heated by two 300 J, frequency-doubled (i.e., the wavelength of the laser is λ = 0.526 µm for a better X-ray conversion efficiency) nanosecond laser beams.…”

Section: Interpretation Of Experimentsmentioning

confidence: 99%

“…The authors would like to thank all the authors of References [27][28][29][30][31]33,34] for the experimental spectra as well as J. Colgan for providing the ATOMIC spectra.…”

Section: Acknowledgmentsmentioning

confidence: 99%

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Detailed Opacity Calculations for Astrophysical Applications

Pain

Gilleron

Comet

2017

Atoms

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Nowadays, several opacity codes are able to provide data for stellar structure models, but the computed opacities may show significant differences. In this work, we present state-of-the-art precise spectral opacity calculations, illustrated by stellar applications. The essential role of laboratory experiments to check the quality of the computed data is underlined. We review some X-ray and XUV laser and Z-pinch photo-absorption measurements as well as X-ray emission spectroscopy experiments involving hot dense plasmas produced by ultra-high-intensity laser irradiation. The measured spectra are systematically compared with the fine-structure opacity code SCO-RCG. The focus is on iron, due to its crucial role in understanding asteroseismic observations of β Cephei-type and Slowly Pulsating B stars, as well as of the Sun. For instance, in β Cephei-type stars, the iron-group opacity peak excites acoustic modes through the "kappa-mechanism". Particular attention is paid to the higher-than-predicted iron opacity measured at the Sandia Z-machine at solar interior conditions. We discuss some theoretical aspects such as density effects, photo-ionization, autoionization or the "filling-the-gap" effect of highly excited states.

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Section: Interpretation Of Experimentsmentioning

confidence: 99%

Section: Interpretation Of Experimentsmentioning

confidence: 99%

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Detailed Opacity Calculations for Astrophysical Applications

Pain

Gilleron

Comet

2017

Atoms

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“…In ref. [24], this spectrum was also interpreted with the SCO-RCG code [22], and the differences between the two calculations are very small.…”

Section: Photoabsorption Experimentsmentioning

confidence: 99%

A project based on multi-configuration Dirac–Fock calculations for plasma spectroscopy

Comet

Pain

Gilleron

et al. 2017

High Energy Density Physics

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We present a project dedicated to hot plasma spectroscopy based on a Multi-Configuration DiracFock (MCDF) code, initially developed by J. Bruneau. The code is briefly described and the use of the transition state method for plasma spectroscopy is detailed. Then an opacity code for localthermodynamic-equilibrium plasmas using MCDF data, named OPAMCDF, is presented. Transition arrays for which the number of lines is too large to be handled in a DLA calculation can be modeled within the Partially Resolved Transition Array method or using the Unresolved Transition Arrays formalism in jj-coupling. An improvement of the original Partially Resolved Transition Array method is presented which gives a better agreement with Detailed Line Accounting computations. Comparisons with some absorption and emission experimental spectra are shown. Finally, the capability of the MCDF code to compute atomic data required for collisional-radiative modeling of plasma at non local thermodynamic equilibrium is illustrated. Additionally to photoexcitation, this code can be used to calculate photoionization, electron impact excitation and ionization cross-sections as well as autoionization rates in the Distorted-Wave or Close Coupling approximations. Comparisons with cross-sections and rates available in the literature are discussed.

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“…Finally, a mixed mode that allows one to deal with some configurations in detailed mode and other configurations in UTA mode has recently been implemented. The availability of these new features stimulates the effort in calculations aimed at obtaining accurate opacities in order to analyse data obtained in recent laser‐plasma experiments …”

Section: Introductionmentioning

confidence: 99%

Opacity calculations in X and XUV range using a detailed atomic code

Poirier

2018

Contributions to Plasma Physics

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Calculations of accurate opacities in X and XUV range are of high interest for several domains such as astrophysics or inertial fusion science. Such quantities may be investigated through laser-plasma interaction in the indirect-drive scheme. In this work absorption properties of such plasmas are analysed using the Flexible Atomic Code. Detailed and unresolved-transition-array modes are investigated, and some results obtained with the mixed mode recently developed are also proposed. For a carbon plasma the present approach agrees with the results obtained with the superconfiguration code SCO. Some results are provided about the X-ray opacity of nickel, and a comparison with data from a recent campaign on LULI 2000 facility is done. This comparison demonstrates that the Unresolved Transition Array approach may be insufficient, e.g., to determinate the accurate position and shape of the 2p-3d structure in nickel at about 25 eV. The case of non-electric-dipole-type transitions, such as magnetic dipole transitions is addressed. The electric-dipole and magnetic-dipole transitions are studied here in the case of the 3 * n complex of five tungsten ions, with charge states similar to those found in the tokamak divertors. It is demonstrated that the unresolved transition array formulas provide a fairly accurate description of the most important absorption structures, but fail to reproduce correctly the behavior of the opacity in the wings of these main structures.

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X-ray opacity measurements in mid-Z dense plasmas with a new target design of indirect heating

Cited by 10 publications

References 23 publications

Detailed Opacity Calculations for Astrophysical Applications

Detailed Opacity Calculations for Astrophysical Applications

A project based on multi-configuration Dirac–Fock calculations for plasma spectroscopy

Opacity calculations in X and XUV range using a detailed atomic code

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