A5034590610- Laser-induced spectroscopy and plasma
- Laser-Plasma Interactions and Diagnostics
- High-pressure geophysics and materials
- Diamond and Carbon-based Materials Research
- Astro and Planetary Science
- Laser-Matter Interactions and Applications
- Atomic and Molecular Physics
- Laser Design and Applications
- Planetary Science and Exploration
- Magnetic confinement fusion research
- Geological and Geochemical Analysis
- Particle Dynamics in Fluid Flows
- Laser-Ablation Synthesis of Nanoparticles
- Geophysics and Sensor Technology
- Laser Material Processing Techniques
- Ion-surface interactions and analysis
- Plasma Diagnostics and Applications
- Computational Fluid Dynamics and Aerodynamics
- Gas Dynamics and Kinetic Theory
- Metal and Thin Film Mechanics
- High-Temperature Coating Behaviors
- Aerosol Filtration and Electrostatic Precipitation
- Geochemistry and Elemental Analysis
- Space Satellite Systems and Control
- Seismic Waves and Analysis
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2009-2020
CEA DAM Île-de-France
2009-2020
CEA Paris-Saclay
2020
Université Paris-Saclay
2020
École Polytechnique
2001-2006
Laboratoire pour l'utilisation des lasers intenses
2001-2006
Centre National de la Recherche Scientifique
2002-2006
Sorbonne Université
2004-2006
University of Milan
2001
Lawrence Livermore National Laboratory
2001
In the last few years, high power lasers have demonstrated possibility to explore a new state of matter, so-called warm dense matter. Among possible techniques utilized generate this state, we present dynamic compression technique using lasers. Applications planetary cores material (iron) will be discussed. Finally diagnostics such as proton and hard-x-ray radiography shock propagating in solid target presented.
We present an overview of some recent theoretical and experimental results obtained on the properties iron silica at conditions encountered in planetary interiors. The first part is concerned with development x-ray absorption near edge spectroscopy dynamical experiments using high-energy lasers as a tool to investigate phase transitions structural changes extreme pressure–temperature for these two key constituents. second focuses quasi-isentropic compression technique achieve anticipated...
The conversion efficiency of 351nm laser light to soft x rays (0.1–5keV) was measured for Au, U, and high Z mixture “cocktails” used as hohlraum wall materials in indirect drive fusion experiments. For the spherical targets a direct geometry, flattop pulses smoothing with phase plates are employed achieve constant uniform intensities 1014 1015W∕cm2 over target surface that relevant future ignition experiments at National Ignition Facility [G. H. Miller, E. I. Moses, C. R. Wuest, Nucl. Fusion...
In this article, we investigate the kinetics of iron $\ensuremath{\alpha}\ensuremath{-}\ensuremath{\varepsilon}$ transition under laser-driven ramp compression for deformation rates ranging from 3 to $9\ifmmode\times\else\texttimes\fi{}{10}^{7}\phantom{\rule{0.28em}{0ex}}{\mathrm{s}}^{\ensuremath{-}1}$. As in previous work, observe a plateau rear surface velocity profile at transition. With increasing rate onset pressure raises 11 25 GPa, while duration decreases. These kinetic effects are...
First absolute equation of state measurements obtained for iron with laser driven shock waves are presented. The velocity and the free surface compressed have been simultaneously measured by using a VISAR diagnostic, step targets. pressure range 1–8 Mbar has investigated, which is directly relevant to planetary physics. experiments performed at Laboratoire pour l’Utilisation des Lasers Intenses Ecole Polytechnique.
Plastic materials (CH) doped with mid-$Z$ elements are used as ablators in inertial confinement fusion (ICF) capsules and their surrogates. Hugoniot equation of state (EOS) electronic properties CH germanium (at 2.5% 13% dopant fractions) investigated experimentally up to 7 Mbar using velocity reflectivity measurements shock fronts on the GEKKO laser at Osaka University. Reflectivity temperature were updated a quartz standard. Shocked was measured 532 1064 nm. Theoretical investigation...
Absolute reflectivity and self-emission diagnostics are used to determine the gray-body equivalent temperature of laser-shocked iron partially releasing into a lithium fluoride window. Pressure measured simultaneously by means velocity interferometer system for any reflector interferometers. In temperature-pressure plane, plateau in release is observed which attributed iron’s melting line. Extrapolation data leads at Earth’s inner-outer core boundary 7800±1200K, good agreement with previous...
During the last ten years, ability of high power lasers to generate energy density shocks has made them a reliable tool study extreme states matter. These matter are relevant in many important physics areas such as astrophysics, planetology and ICF physics. Here, we present some representative studies performed by using driven laser shock: melting iron at pressures for geophysics, developments new techniques measure highly compressed radiative shock.
We present a study on the impact of gas atmosphere collision two counterpropagating plasmas (gold and carbon). Imaging optical Thomson scattering data plasma with without helium in between have been obtained at Omega laser facility. Without gas, we observed large scale mixing colliding gold carbon ions. Once ambient is added, remain separated. The difference ionic temperature consistent reduction maximum Mach number flow from $M=7$ to $M=4$. It results factor $\ensuremath{\sim}10$...
Results of ablative Rayleigh–Taylor instability growth experiments performed in indirect drive on the OMEGA laser facility [T. R. Boehly, D. L. Brown, S. Craxton et al., Opt. Commun. 133, 495 (1997)] are reported. These aim at benchmarking hydrocodes simulations and ablator instabilities conditions relevant to ignition framework Laser MégaJoule [C. Cavailler, Plasma Phys. Controlled Fusion 47, 389 (2005)]. The modulated samples under study were made germanium-doped plastic (CHGe), which is...
Understanding and mitigating hydrodynamic instabilities the fuel mix are key elements for achieving ignition in Inertial Confinement Fusion. Cryogenic indirect-drive implosions on National Ignition Facility have evidenced that ablative Rayleigh-Taylor Instability (RTI) is a driver of hot spot mix. This motivates switch to more flexible higher adiabat implosion design [O. A. Hurricane et al., Phys. Plasmas 21, 056313 (2014)]. The shell instability also main candidate performance degradation...
High power lasers are a tool that can be used to determine important parameters in the context of Warm Dense Matter, i.e. at convergence low-temperature plasma physics and finite-temperature condensed matter physics. Recent results concerning planet inner core materials such as water iron presented. We determined equation state, temperature index refraction for pressures up 7 Mbar. The release state LiF window allowed us investigate melting near boundary conditions. Finally, first...
Wall and laser spot motion measurements in empty, propane-filled plastic (CH)-lined gold coated cylindrical hohlraums were performed on the Omega facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. was measured using axial two-dimensional (2D) x-ray imaging perpendicularly observed through a thinned wall streaked hard imaging. Experimental results 2D hydrodynamic simulations show that while empty targets exhibit on-axis plasma collision, CH-lined inhibit expansion, corroborated...
Glow discharge polymer hydrocarbon (GDP-CH) is used as the ablator material in inertial confinement fusion (ICF) capsules for Laser Mégajoule and National Ignition Facility. Due to its fabrication process, GDP-CH chemical composition structure differ from commercially available plastics detailed knowledge of properties warm dense matter regime needed achieve accurate design ICF capsules. First-principles ab initio simulations principal Hugoniot up 8 Mbar were performed using quantum...
Pressure, density, temperature, and reflectivity measurements along the principal Hugoniot of Ge-doped plastics used in Inertial Confinement Fusion capsules surrogates were obtained to pressures reaching up 7 Mbar compared Quotidian Equation State models. The experiment was performed using GEKKO XII laser at Institute Laser Engineering Osaka University Japan. High precision pressure density a quartz standard found be good agreement with theoretical curves. Modeling show that shocked samples...
Experimental investigation of stimulated Raman (SRS) and Brillouin (SBS) scattering have been obtained at the Ligne-d'Intégration-Laser facility (LIL, CEA-Cesta, France). The parametric instabilities (LPI) are driven by firing four laser beamlets (one quad) into millimeter size, gas-filled hohlraum targets. A quad delivers energy on target 15 kJ 3ω in a 6-ns shaped pulse. is focused means gratings optically smoothed with kinoform phase plate smoothing spectral dispersion-like 2 GHz and/or 14...
A laminated ablator is explored as an alternative concept for stabilizing the ablative Rayleigh-Taylor instability which develops in inertial fusion targets. Experiments measuring growth of planar foils are reported. Consistent with both theory and simulations, a significant reduction perturbation experimentally observed ablators comparison to what classical uniform ablators. Such enhanced hydrodynamic stability opens opportunities design high-gain
In this paper, we report on the quasi-isentropic compression of an iron sample using ramp shaped laser irradiation. This technique allows us to quasi-isentropically compress up 700 GPa and 8500 K. To our knowledge, these data are highest pressures reached in off-Hugoniot conditions closest thermodynamic states thought exist Earth-like planetary cores. The experiment was performed Ligne d'Intégration facility at CESTA, Bordeaux, France.
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation G. Huser, A. Casner, L. Masse, S. Liberatore, D. Galmiche, Jacquet, M. Theobald; Reduced ablative Rayleigh–Taylor growth measurements in indirectly driven laminated foils. Phys. Plasmas 1 January 2011; 18 (1): 012706. https://doi.org/10.1063/1.3545987 Download citation file: Ris (Zotero) Reference Manager...
The interface velocity of iron partially releasing into a lithium fluoride (LiF) window has been measured using VISAR technique. Corrections to the fringe-per-velocity relationship are presented. A good agreement with hydrodynamic simulations is found at laser intensities <2×1013 W/cm2. For higher intensities, velocities appear be lower than numerical predictions. strong modification compressed LiF index refraction behavior might explain such discrepancy.
The feasibility and reliability of a multiple laser shock generation to study the equation state surface off principal Hugoniot curve approach an isentropic compression has been demonstrated. technique is based on use double pulse. A strong was generated in iron targets precompressed by first weak shock. effect precompression studied. experiment performed at Laboratoire pour l'Utilisation des Lasers Intenses laboratory.
The Ligne d'Integration Laser (LIL) facility has been designed as a prototype for the MegaJoule (LMJ) which is cornerstone of French 'Simulation Program'. This laser intensively used to test and improve LMJ components. In addition, large panel plasma diagnostics installed currently perform laser–plasma experiments. After brief discussion about LIL design, we present last results in various physics domains.
The ablator material for inertial confinement fusion (ICF) capsules on the Laser Mégajoule is a glow-discharge polymer (GDP) plastic. Its equation of state (EOS) primary importance design such capsules, since it has direct consequences shock timing and essential to mitigate hydrodynamic instabilities. Using ab initio molecular dynamics (AIMD), we have investigated 300-K isotherm amorphous CH(1.37)O(0.08) plastic, whose structure close GDP isotherm, which often used as cold curve within...
A high-resolution x-ray imager (HRXI) devoted to laser-plasma experiments combines two state-of-the-art technologies developed in France: a microscope and high-speed streak camera. The resulting streaked achieves spatial temporal resolutions of approximately 5 microm 10 ps, respectively. HXRI has recorded enhanced resolution radiographs indirectly driven targets on OMEGA. This paper describes the main features instrument details activation process OMEGA (particularly alignment). Recent...