Theoretical interpretation of X-rays photo-absorption in medium-Z elements plasmas measured at LULI2000 facility |
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Authors: | T. Blenski,G. Loisel,M. Poirier,F. Thais,P. Arnault,T. Caillaud,J. Fariaut,F. Gilleron,J.-C. Pain,Q. Porcherot,C. Reverdin,V. Silvert,B. Villette,S. Bastiani-Ceccotti,S. Turck-Chiè ze,W. Foelsner,F. de Gaufridy De Dortan |
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Affiliation: | aCEA, IRAMIS, Service “Photons, Atomes et Molécules”, Centre d’Études de Saclay, F-91191 Gif-sur-Yvette Cedex, France;bCEA, DAM, DIF, F-91297 Arpajon, France;cLULI, UMR No. 7605 CNRS – École Polytechnique, F-91128 Palaiseau Cedex, France;dCEA, IRFU, Service d’Astrophysique, Centre d’Études de Saclay, F-91191 Gif-sur-Yvette Cedex, France;eMax-Planck-Institut für Quantenoptik, 85748 Garching, Germany;fInstitute of Nuclear Fusion, Universidad Politecnica de Madrid, Spain;gLaboratoire d'Optique Appliquée, ENSTA-Paritech-Polytechnique, Chemin de la Hunière, 91671 Palaiseau, France |
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Abstract: | We analyzed the spectra of X-ray transmission through radiatively heated medium-Z plasma (Fe, Ni, Cu and Ge) measured at LULI2000 facility in the wavelength range of 2p–nd transitions. The analysis was performed using the statistical superconfiguration code SCO, two line-by-line opacity codes based on the HULLAC and FAC packages and a new hybrid statistical-detailed code SCORCG. The temperature and mass density of the samples were estimated from hydrodynamic simulations based on the cavity radiative temperature measurements. The theory–experiment agreement is relatively good in the wavelength range corresponding to the 2p–3d transitions except in the germanium case. In the wavelength range of the 2p–2d, n > 3 transitions a relatively good theory–experiment agreement was found in the copper case. As predicted by calculations the separation of the characteristic spin-orbit-split 2p–3d structures, absent in the iron measured spectrum, appears in the nickel spectrum and is visible in the copper and germanium spectra. Comparisons of the experimental transmission with calculations confirm the importance of the relativistic configuration interaction. The absorption strength of the measured germanium 2p–3d transition is much larger than that obtained from the codes. Spatial temperature and density gradients, relatively high in the germanium sample, may be at the origin of this discrepancy. |
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Keywords: | Dense plasma of medium Z elements X-rays opacity Line-by-line and statistical atomic physics codes Spin&ndash orbit splitting 2p&ndash 3d transitions |
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