DRF: Thesis SL-DRF-21-0436

RESEARCH FIELD

Plasma physics and -matter interactions / Corpuscular physics and outer space

TITLE

Statistical methods for the analysis of complex spectra in hot plasmas: applications in fusion science and astrophysics

ABSTRACT

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.

This research program requires a deep knowledge in quantum physics and in atomic physics in plasmas. Several applications may be foreseen: interpretation of recent opacity measurements performed on LULI2000 laser at Ecole Polytechnique, extreme-UV source optimization for nanolithography, determination of radiative power losses in a tungsten to characterize operation, or the open subject of the characterization of photoionized silicon plasma analyzed in Sandia Z-pinch in connection with astrophysical observations.

LOCATION

Institut rayonnement et matière de Saclay Service Laboratoire Interactions, Dynamique et Physique à Haute Intensité Place: Saclay Start date of the thesis: 01/10/2021

CONTACT PERSON

Michel POIRIER CEA DRF/IRAMIS/LIDyL/PHI Laboratoire Interactions, Dynamique et Lasers DRF/IRAMIS/LIDYL/PHI CEA/Saclay Bât.522

Commissariat à l'énergie atomique et aux énergies alternatives 1 Institut national des sciences et techniques nucléaires www­instn.cea.fr 91191 Gif/Yvette FRANCE Phone number: 00169084629 Email: [email protected]

UNIVERSITY / GRADUATE SCHOOL

Paris-Saclay Ondes et Matière

FIND OUT MORE

http://iramis.cea.fr/LIDYL/Phocea/Membres/Annuaire/index.php?uid=poirier http://iramis.cea.fr/LIDYL/MHDE

THESIS SUPERVISOR

Michel POIRIER CEA DRF/IRAMIS/LIDyL/PHI Laboratoire Interactions, Dynamique et Lasers DRF/IRAMIS/LIDYL/PHI CEA/Saclay Bât.522 91191 Gif/Yvette FRANCE

Commissariat à l'énergie atomique et aux énergies alternatives 2 Institut national des sciences et techniques nucléaires www­instn.cea.fr

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