Caractérisation des plasmas chauds et denses produits par interaction laser à ultra-haute intensité d'une cible solide

Abstract : In the fields of stellar interiors and inertial confinement fusion, determination of dense and hot plasmas opacity is a major goal. Laboratory plasmas, close to both solid density and hundreds of electron-volt temprature are needed to improve theoretical and numerical models. This work is focused on the characterization of such plasmas formed by ultra-high-intensity laser interaction with solid matter. Experimental measurements on aluminium plasmas are presented. They highlight the complexity arising in the interpretation of K-shell x-ray emission spectra, typically used to infer the plasma density and temperature. To reproduce these experimental results, simulations using 3 codes were carried out (PIC code - CALDER, radiationhydrodynamics code - MULTI and atomic population code - SPECT3D). This work concludes on the need to account for many physical phenomena to further characterize the plasma: non-LTE equilibrium, hot electrons, time evolution and spatial gradients. All these issues are addressed and discussed. This kind of experiment opens bright perspectives in the study of very-high-density plasmas. Good temporal and spatial resolution is nevertheless necessary to ensure an accurate characterization of the plasma density and temperature.
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Submitted on : Saturday, September 26, 2015 - 7:27:22 PM
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  • HAL Id : tel-01205713, version 1

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Vincent Dervieux. Caractérisation des plasmas chauds et denses produits par interaction laser à ultra-haute intensité d'une cible solide. Physique des Hautes Energies - Expérience [hep-ex]. École doctoral de Polytechnique, 2015. Français. ⟨tel-01205713⟩

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