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PhD subjects

1 sujet IRAMIS

Dernière mise à jour : 17-09-2019


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• Plasma physics and laser-matter interactions

 

Analysis of complex spectra in highly-ionized plasmas : applications to fusion science and astrophysics

SL-DRF-19-0689

Research field : Plasma physics and laser-matter interactions
Location :

Service Laboratoire Interactions, Dynamique et Lasers

Matière à Haute Densité

Saclay

Contact :

Michel POIRIER

Starting date : 01-10-2019

Contact :

Michel POIRIER
CEA - DRF/IRAMIS/LIDyL/MHDE

+33 (0)1 69 08 46 29

Thesis supervisor :

Michel POIRIER
CEA - DRF/IRAMIS/LIDyL/MHDE

+33 (0)1 69 08 46 29

Personal web page : http://iramis.cea.fr/lidyl/Phocea/Membres/Annuaire/index.php?uid=poirier

Laboratory link : http://iramis.cea.fr/LIDYL/MHDE/

A vast range of topics in physics such as the star internal structure, the X-ray emission of accretion disks, the dynamics of inertial confinement fusion, or new radiation sources requires an accurate knowledge of the radiative properties of hot plasmas. Such plasmas exhibit spectra consisting of a large number of lines often merging in unresolved arrays. Statistical methods are used for the interpretation of such spectra. Using second quantization and tensor algebra techniques, one may obtain quantities such as the average and variance of transition energies inside these unresolved arrays. Though a wide literature exists on this subject, certain types of transitions, e.g., magnetic dipole transitions inside a given configuration or processes involving several electron jumps, have not been considered up to now. In addition to this analytical study, a numerical work involving the Flexible Atomic Code will be proposed for this thesis. This study will concern plasmas either at thermodynamic equilibrium, or out of equilibrium, where level population is obtained by solving a system of kinetic equations. Several applications may be foreseen: interpretation of recent opacity measurements performed on LULI2000 laser at Ecole Polytechnique, determination of radiative power losses in a tungsten plasma to characterize tokamak operation, or the open subject of the characterization of photoionized silicon plasma analyzed in Sandia Z-pinch in connection with astrophysical observations.

 

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