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Étude des plasmas créés par l'interaction laser X - matière

Abstract : This thesis took advantage of the emerging newly developed 4th generation sources of light, namely the free electron lasers, to create and characterize a state of matter under extreme conditions which is still obscure: the warm dense matter (WDM). An experiment allowed to study the transitions between the different phases, solid/WDM/plasma, and characterize the mechanism responsible for the equilibration. The laser pulse FLASH, of duration and energy equal to about 20 femtoseconds and 30 µJ respectively, is micro-focussed on a solid target producing an isochoric heating. The intensity, greater than 10^16 W/cm^2, has never been reached in such an experimental context so far. Emission spectra from an aluminium plasma are studied with a code coupling a genetic algorithm and a code of atomic physics, in order to interpret the whole temporal evolution of the XUV laser-matter interaction for the first time, despite the time integration of the experimental spectra. The first experimental proof of the important contribution of the Auger effect in the isochoric heating of an aluminium target is established. The first observation of the X-ray emission of a boron nitride target under extreme conditions has been investigated by a preliminary study. Additionally, the effect of hot electrons on the electron population distribution in the energy levels of the ions is analysed and shows an important similarity with the photo-ionization process occurring in XUV/X-ray laser-matter interaction.
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https://tel.archives-ouvertes.fr/tel-00574363
Contributor : Eric Galtier <>
Submitted on : Tuesday, January 8, 2013 - 1:22:06 PM
Last modification on : Friday, March 5, 2021 - 3:12:05 PM
Long-term archiving on: : Saturday, April 1, 2017 - 1:47:34 AM

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  • HAL Id : tel-00574363, version 2

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Eric Galtier. Étude des plasmas créés par l'interaction laser X - matière. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2010. Français. ⟨NNT : 2010PA066422⟩. ⟨tel-00574363v2⟩

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