Étude expérimentale du transport de l’énergie radiative dans les plasmas denses par spectroscopie d'absorption et d'émission

Abstract : This PhD work is an experimental study, based on emission and absorption spectroscopy of hot and dense nanosecond laser-produced plasmas. Atomic physics in such plasmas is a complex subject and of great interest especially in the fields of astrophysics or inertial confinement fusion. On the atomic physics point of view, this means determining parameters such as the average ionization or opacity in plasmas at given electronic temperature and density. Atomic physics codes then need of experimental data to improve themself and be validated so that they can be predictive for a wide range of plasmas. With this work we focus on plasmas whose electronic temperature varies from 10 eV to more than a hundred and whose density range goes from 10⁻⁵ à 10⁻² g/cm³. In this thesis, there are two types of spectroscopic data presented which are both useful and necessary to the development of atomic physics codes because they are both characteristic of the state of the studied plasma: 1) some absorption spectra from Cu, Ni and Al plasmas close to local thermodynamic equilibrium; 2) some emission spectra from non local thermodynamic equilibrium plasmas of C, Al and Cu. This work highlights the different experimental techniques and various comparisons with atomic physics codes and hydrodynamics codes.
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Maylis Dozières. Étude expérimentale du transport de l’énergie radiative dans les plasmas denses par spectroscopie d'absorption et d'émission. Physique des Hautes Energies - Expérience [hep-ex]. Université Paris-Saclay, 2016. Français. ⟨NNT : 2016SACLS454⟩. ⟨tel-01527622⟩

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