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Stellar seismology reveals some interior properties of thousands ofsolar-type stars but the solar seismic sound speed stays puzzling since adecade as it disagrees with the Standard Solar Model (SSM) prediction. One ofthe explanations of this disagreement may be found in the treatment of thetransport of radiation from the solar core to the surface. As the sameframework is used for other stars, it is important to check precisely thereliability of the interacting cross sections of photons with each species inorder to ensure the energy transport for temperature T > 2 - 10$^6$ K anddensity $\rho$ > 0.2 g/cm$^3$. In this paper, we propose a new technique toreach the domain of temperature and density found in the solar radiativeinterior. This technique called the Double Ablation Front (DAF) is based on ahigh conversion of the laser energy into X-rays thanks to moderated Z materialirradiated by laser intensity between 1.5 $\times$ 10$^{15}$ W/cm$^2$ and 4$\times$ 10$^{15}$ W/cm$^2$. This high conversion creates, in addition to theelectronic front a second ablation front in the moderated Z material. Betweenthe two fronts there is a plateau of density and temperature that we exploit toheat a sample of iron or of oxide. The first simulations realized with thehydrodynamic code CHIC show that this technique allows to reach conditionsequivalent to half the radiative zone of the Sun with high stability both intime and space. We examine the possibility to measure both iron and oxygenabsorption spectra.

New opacity measurement principle for LMJ-PETAL laser facility