A5020386847- Atomic and Molecular Physics
- Laser-induced spectroscopy and plasma
- Stellar, planetary, and galactic studies
- X-ray Spectroscopy and Fluorescence Analysis
- Plasma Diagnostics and Applications
- Laser-Plasma Interactions and Diagnostics
- Advanced Chemical Physics Studies
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Mass Spectrometry Techniques and Applications
- Solar and Space Plasma Dynamics
- Scientific Measurement and Uncertainty Evaluation
- Ion-surface interactions and analysis
- Ionosphere and magnetosphere dynamics
- Magnetic confinement fusion research
- Spectroscopy and Laser Applications
- Advanced Thermodynamics and Statistical Mechanics
- Superconducting and THz Device Technology
- Statistical Mechanics and Entropy
- Theoretical and Computational Physics
- Electron and X-Ray Spectroscopy Techniques
- High-pressure geophysics and materials
- Advanced X-ray Imaging Techniques
- Solar Thermal and Photovoltaic Systems
- Muon and positron interactions and applications
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2025
CEA DAM Île-de-France
2013-2025
Université Paris-Saclay
2025
Centre National de la Recherche Scientifique
1997-2017
Institut Rayonnement-Matière de Saclay
2017
Ecolab (France)
2017
Aix-Marseille Université
2017
Laboratoire Aimé Cotton
2017
Université Paris-Sud
2017
École Polytechnique
1995-2011
The first systematic study of opacity dependence on atomic number at stellar interior temperatures is used to evaluate discrepancies between measured and modeled iron [J. E. Bailey et al., Nature (London) 517, 56 (2015)NATUAS0028-083610.1038/nature14048]. High-temperature (>180 eV) chromium nickel opacities are with ±6%-10% uncertainty, using the same methods employed in previous experiments. 10%-20% experiment reproducibility demonstrates reliability. overall model-data disagreements...
Opacity model differences with Fe opacity measurements at high temperature (T>180 eV) and electron density (n_{e}>3×10^{22} cm^{-3}) nearly solar interior conditions have remained unresolved [Bailey et al., Nature 517, 56 (2015)10.1038/nature14048 Nagayama Phys. Rev. Lett. 122, 235001 (2019)PRLTAO0031-900710.1103/PhysRevLett.122.235001]. Systematic errors from temporal gradients are one hypothesis for the discrepancy. Past data recorded on x-ray film provided spectral over a time determined...
The Sun is the most studied of all stars, and thus constitutes a benchmark for stellar models. However, our vision still incomplete, as illustrated by current debate on its chemical composition. problem reaches far beyond abundances intimately linked to microscopic macroscopic physical ingredients solar models such radiative opacity, which experimental results have been recently measured that await theoretical explanations. We present opacity profiles derived from helioseismic inferences...
Absorption of the 2p-3d transitions iron has been measured using point projection spectroscopy. Thin C tamped Fe foils were heated around 20 eV by X-rays generated in gold spherical hohlraums irradiated high-power laser ASTERIX IV. V to X observed spectral vicinity 730 (17 Å). The Ag backlighter source and absorbed spectra recorded on same shot a TlAP crystal spectrograph. experimental have reproduced two superconfiguration local thermodynamic equilibrium codes SCO STA. Detailed statistical...
An experimental and numerical analysis of the collision two plasmas produced from laser-exploded Al/Al Al/Mg pairs foils is presented. Various imaging spectroscopic x-ray techniques have been used to diagnose over a broad range intertarget distances laser intensities. Ion temperatures in 10 keV measured Doppler broadening. Electron densities deduced line ratios interpenetration determined by spatial extent Mg Al lines. Eulerian multifluid simulations developed coupled atomic physics...
Understanding stellar interiors, inertial confinement fusion, and Z pinches depends on opacity models for mid-Z plasmas in the 100-300 eV temperature range. These are complex experimental validation is crucial. In this paper we describe diagnosis of first experiments to measure iron plasma at a high enough produce charge states electron configurations that exist solar interior. The dynamic Hohlraum x-ray source Sandia National Laboratories' facility was used both heat backlight Mg/Fe CH...
In order to design extreme ultraviolet (EUV) sources for nanolithography, xenon EUV emission has been experimentally studied in a plasma generated by the interaction of high-power laser with droplet jet. A theoretical model assuming that resulting is optically thick allows one find distribution relevant ions and transitions involved process. Atomic physics computations are performed using HULLAC code give detailed account involved. The importance 4p–4d, 4d–4f, 4d–5p stressed, as well need...
This paper deals with theoretical studies on the $2p\ensuremath{-}3d$ absorption in iron, nickel, and copper plasmas related to LULI2000 (Laboratoire pour l'Utilisation des Lasers Intenses, 2000J facility) measurements which target temperatures were of order 20 eV plasma densities range 0.004--0.01 ${\mathrm{g}/\mathrm{cm}}^{3}$. The radiatively heated targets close local thermodynamic equilibrium (LTE). structure transitions has been studied help statistical superconfiguration opacity code...
A general method for the calculation of partition function a canonical ensemble noninteracting bound electrons is presented. It consists in doubly recursive procedure with respect to number and orbitals. Contrary existing approaches, this recursion relation contains no alternate summation positive negative numbers, which was main source numerical uncertainties. accompanied normalization through determination free parameter consistent zeroth-order saddle-point approximation. The allows one...
Absorption of L-M and L-N transitions nickel has been measured using point projection spectroscopy. The x-ray radiation from laser-irradiated gold cavities was used to heat volumetrically foils "tamped with carbon" up 20 eV. Experimental spectra have analyzed calculations based on the spin-orbit split arrays statistical approach performed for each ionic species Ni5+ Ni11+. Using a least-squares fit, this method provides an ion distribution broader than at local thermodynamic equilibrium,...
A general statistical model for simulating electric-dipolar lines in complex spectra of LTE or NLTE plasmas is presented. In this model, each transition array represented by a pair Gaussian subarrays, whose characteristics (average wavenumbers, strength distributions, and numbers lines) change continuous way from LS (where one subarray vanishes) to jj coupling. The amplitude the two-level energies line are picked at random joint triple distribution that takes into account correlation between...
The extension to recursion over holes of the Gilleron and Pain method for calculating partition functions a canonical ensemble noninteracting bound electrons is presented as well generalization efficient computation collisional line broadening.