Absorption spectroscopy of mid and neighboring Z plasmas: Iron, nickel,copper and germanium

Loisel, Guillaume; Arnault, Philippe; Bastiani-Ceccotti, S.; Błeński, T.; Caillaud, T.; Fariaut, J.; Fölsner, W.; Gilleron, F.; Pain, Jean‐Christophe; Poirier, Michel; Reverdin, C.; Silvert, V.; Thais, F.; Turck‐Chièze, S.; Villette, B.

doi:10.1016/j.hedp.2009.05.015

Cited by 41 publications

(28 citation statements)

References 27 publications

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“…The second was obtained in an experiment at Sandia Z-pinch facility in the USA [14]. The third, most recent, is a transmission spectrum recorded at LULI 2000 laser facility of Ecole Polytechnique in France [15].…”

Section: Experiments Interpretationsmentioning

confidence: 99%

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A consistent approach for mixed detailed and statistical calculation of opacities in hot plasmas

Porcherot

Pain

Gilleron

et al. 2011

High Energy Density Physics

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Absorption and emission spectra of plasmas with multicharged-ions contain transition arrays with a huge number of coalescent electricdipole (E1) lines, which are well suited for treatment by the unresolved transition array and derivative methods. But, some transition arrays show detailed features whose description requires diagonalization of the Hamiltonian matrix. We developed a hybrid opacity code, called SCORCG, which combines statistical approaches with fine-structure calculations consistently. Data required for the computation of detailed transition arrays (atomic configurations and atomic radial integrals) are calculated by the super-configuration code SCO (SuperConfiguration Opacity), which provides an accurate description of the plasma screening effects on the wave-functions. Level energies as well as position and strength of spectral lines are computed by an adapted RCG routine of R. D. Cowan. The resulting code provides opacities for hot plasmas and can handle mid-Z elements. The code is also a powerful tool for the interpretation of recent laser and Z -pinch experimental spectra, as well as for validation of statistical methods.

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Section: Experiments Interpretationsmentioning

confidence: 99%

“…For the LULI experiments we mainly focus on shot 31 of 2008 campaign for opacities of mid-Z elements [15]. Shot 31 had a copper sample heated to 16 eV and with a density of 5 mg/cc.…”

Section: Copper On Luli 2000 Laser Facilitymentioning

confidence: 99%

A consistent approach for mixed detailed and statistical calculation of opacities in hot plasmas

Porcherot

Pain

Gilleron

et al. 2011

High Energy Density Physics

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“…[4,5]. Let us mention here that the 2p − 3d splitting partially appears in the LULI data though less than expected.…”

Section: Ifsa 2011mentioning

confidence: 57%

“…A presentation of the LULI campaign on X-ray opacities of iron, nickel, copper, and germanium, as well as details about the theoretical models used have been published elsewhere [4,5].…”

Section: Comparison Of Experimental Results To Statistical and Detailmentioning

confidence: 99%

“…In this sense, Back et al [3] have demonstrated that in a germanium plasma, when the temperature T increases from 20 eV to 50 eV, the 2p − 3d array evolves from a spin-orbit split structure to a single structure. The recent experiment performed on the LULI2000 facility [4] aimed at checking a similar effect at fixed T but varying the atomic number Z: at T ∼ 20 eV, the 2p − 3d splitting is expected to vanish when Z decreases from 29 (Cu) to 26 (Fe). To describe this experiment, several models have been used and compared [5]: a statistical analysis with the superconfiguration code SCO [6], detailed-level accounting approaches using either HULLAC [7] or FAC [8] packages, the mixed approach SCO-RCG [9] combining the SCO approach with a detailed line analysis based on Cowan's code, and the collisional-radiative code SCRIC [10] suited to characterize the non-local-thermodynamic-equilibrium effects.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical interpretation for 2p−ndabsorption spectra of iron, nickel, and copper in X-ray range measured at the LULI2000 facility

Poirier

Arnault

Bastiani-Ceccotti

et al. 2013

EPJ Web of Conferences

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Abstract. The 2p − nd absorption structures in medium Z elements present a valuable benchmark for atomic models since they exhibit a complex dependence on temperature and density. For these transitions lying in the X-ray range, one observes a competition between the spin-orbit splitting and the broadening associated to the excitation of complex structures. Detailed opacity codes based on the HULLAC or FAC suites agree with the statistical code SCO; but in iron computations predict higher peak absorption than measured. An addition procedure on opacities calculated with detailed codes is proposed and successfully tested.

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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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Absorption spectroscopy of mid and neighboring Z plasmas: Iron, nickel,copper and germanium

Cited by 41 publications

References 27 publications

A consistent approach for mixed detailed and statistical calculation of opacities in hot plasmas

A consistent approach for mixed detailed and statistical calculation of opacities in hot plasmas

Theoretical interpretation for 2p−ndabsorption spectra of iron, nickel, and copper in X-ray range measured at the LULI2000 facility

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

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