A5020505167- Laser-induced spectroscopy and plasma
- Laser Material Processing Techniques
- Laser-Plasma Interactions and Diagnostics
- Computational Fluid Dynamics and Aerodynamics
- Laser-Ablation Synthesis of Nanoparticles
- High-pressure geophysics and materials
- Ocular and Laser Science Research
- Gas Dynamics and Kinetic Theory
- Fluid Dynamics and Turbulent Flows
- Laser Design and Applications
- Ion-surface interactions and analysis
- Laser-Matter Interactions and Applications
- Gamma-ray bursts and supernovae
- Magnetic confinement fusion research
- Nonlinear Optical Materials Studies
- High-Velocity Impact and Material Behavior
- Probabilistic and Robust Engineering Design
- Structural Response to Dynamic Loads
- Advanced Surface Polishing Techniques
- Atomic and Molecular Physics
- Combustion and Detonation Processes
- Advanced Multi-Objective Optimization Algorithms
- Astro and Planetary Science
- 3D Printing in Biomedical Research
- Energetic Materials and Combustion
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2011-2024
Centre d'Études Scientifiques et Techniques d'Aquitaine
2005-2021
Centre Lasers Intenses et Applications
2004-2012
Université de Bordeaux
2006-2012
Centre National de la Recherche Scientifique
1995-2011
Inserm
2010
Bordeaux Population Health
2010
Australian National University
2007
Hokkaido University
2007
CEA DAM Île-de-France
1999-2001
Extremely high pressures (approximately 10 TPa) and temperatures (5 x 10(5) K) have been produced using a single laser pulse (100 nJ, 800 nm, 200 fs) focused inside sapphire crystal. The creates an intensity over 10(14) W/cm2 converting material within the absorbing volume of approximately 0.2 microm3 into plasma in few fs. A pressure TPa, far exceeding strength any material, is created generating strong shock rarefaction waves. This results formation nanovoid surrounded by shell...
We present here the experimental and theoretical studies of a single femtosecond laser pulse interaction inside bulk transparent media (sapphire, glass, polymer). This leads to drastic transformations in solid resulting void formation dielectric. The energy is absorbed within volume approximately $0.15\phantom{\rule{0.3em}{0ex}}\mathrm{\ensuremath{\mu}}{\mathrm{m}}^{3}$ creating pressure temperature comparable that core strong multi-kilo-tons explosion. material this rapidly atomized,...
Abstract The energy deposition of ions in dense plasmas is a key process inertial confinement fusion that determines the α-particle heating expected to trigger burn wave hydrogen pellet and resulting high thermonuclear gain. However, measurements ion stopping are scarce mostly restricted velocities where theory agrees with data. Here, we report experimental data at low projectile near Bragg peak, force reaches its maximum. This parameter range features largest theoretical uncertainties...
In this paper, a nanosecond LIFT process is analyzed both from experimental and modeling points of view. Experimental results are first presented compared to simple estimates obtained physical analysis, i.e. energy balance, jump relations analytical pocket dynamics. Then self-consistent 2D axisymmetric strategy presented. It shown that data accessible experiments, jet diameter velocity, can be reproduced. Moreover, some specific mechanisms involved in the rear-surface deformation formation...
We propose a model describing the heating and ablation of metallic target irradiated by subpicosecond laser pulse. It takes into account temperature equilibration between electrons ions density variation material during process. A simple analytical equation state is developed, which allows one to calculate total pressure in heated layer for different electron ion temperatures. The thermodynamic behavior nonequilibrium system discussed, spinodals cohesion limits are introduced. applied...
We present a theoretical model and its numerical realization, which describes submicron cavity formation in transparent dielectric under tight focusing of ultrashort laser pulse. The contains two parts. first one provides the energy deposition sample along with balance---the reflection transmission It resolves full set Maxwell's equations two-dimensional geometry coupled to material describing atomic ionization by electric field secondary electron collisions recombination processes. second...
Interaction of a laser beam with target may generate high velocity expanding plasma plume, solid debris, and liquid nano- microparticles. They can be produced from recombination, vapor condensation or by direct expulsion the heated phase. Two distinct sizes particles are observed depending on temperature achieved in plume: Micrometer-size fragments for temperatures lower than critical temperature, nanometer-size higher temperatures. The paper presents experimental observations nanoparticles...
Recently, a European collaboration has proposed the High Power Laser Energy Research (HiPER) facility, with primary goal of demonstrating laser driven inertial fusion fast ignition. HiPER is expected to provide 250 kJ in multiple, 3ω (wavelength λ = 0.35 µm), nanosecond beams for compression and 70 10–20 ps, 2ω The baseline approach ignition by laser-accelerated electrons; cones are considered as means maximize laser–fuel coupling. Earlier studies led identification an all-DT shell, total...
Laser ablation plasma plume expanding into the ambient atmosphere may be an efficient way to produce nanoparticles. From that reason it would interesting study properties of these laser induced plasmas formed under conditions are known favorable for nanoparticles production. In general, behavior can described as a two-stage process: “violent” expansion due absorption beam energy (during pulse) followed by fast adiabatic in gas (after end pulse). Plasma last few microseconds and have...
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 C. Mézel, L. Hallo, A. Souquet, J. Breil, D. Hébert, F. Guillemot; Self-consistent modeling of jet formation process in the nanosecond laser pulse regime. Physics Plasmas 1 December 2009; 16 (12): 123112. https://doi.org/10.1063/1.3276101 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends...
The energy loss of light ions in dense plasmas is investigated with special focus on low to medium projectile energies, i.e., at velocities where the maximum stopping power occurs. In this region, exceptionally large theoretical uncertainties remain and no conclusive experimental data are available. We perform simulations beam-plasma configurations well suited for an test ion highly ionized, laser-generated carbon plasmas. plasma parameters extracted from two-dimensional hydrodynamic...
The European High Power laser Energy Research (HiPER) project aims at demonstrating the feasibility of high gain inertial confinement fusion using fast ignitor approach. A baseline target has been recently developed by Atzeni et al (2007 Phys. Plasmas 14 052702). We study here robustness this during compression phase and define pulse shape tolerances for a successful fuel assembly. comparison between standard relaxation shows that latter allows one to reduce both power contrast growth...
Tight focusing of a subpicosecond laser pulse in transparent dielectrics is an efficient way to release energy and produce plasma. A micro-explosion results submicrometer cavity formation if the deposited exceeds threshold. self-consistent model developed that describes this process. The deposition described by full set Maxwell’s equations three-dimensional geometry it accounts for nonlinear propagation phenomena femtosecond time scale. calculated transferred hydrodynamic code formation....
Small angle x-ray scattering was used to probe in-situ the formation of nanoparticles in plasma plume generated by pulsed laser irradiation a titanium metal surface under atmospheric conditions. The size and morphology were characterized as function irradiance. Two families identified with sizes on order 10 70 nm, respectively. These results confirmed ex-situ transmission electron microscopy experiments.
High power lasers such as NIF in the USA or LMJ France are being developed for inertial confinement fusion applications. However, performance of optics is limited by laser-induced damage (LID), which occurs, instance, potassium dihydrogen phosphate (KH2PO4 KDP) crystals utilized frequency conversion. An accurate equation state (EOS) required to explain LID process and predict size. For design EOS, a pulsed electron beam was used generate quasi-plane stress wave 0.7 GPa KDP. The sample...
Hydrodynamics and robustness of three high yield targets within the HiPER project are presented. Using realistic illumination nonuniformity configuration, hydrodynamic perturbations sensitivity analysis is carried out. A rather simple perturbation modeling sequence validated thanks to 2D simulations. 1D simulations post-processed with such a provide good estimation thermonuclear burn. First estimates safety factor given.
We present experiments and numerical simulations of hypervelocity impacts 0.5 mm steel spheres into graphite, for velocities ranging between 1100 4500 m s-1 Experiments have evidenced that, after a particular striking velocity, depth penetration no longer increases but decreases. Moreover, the projectile is observed to be trapped below crater surface. Using simulations, we show how this experimental result can related both materials, yield strength. A Johnson-Cook model developed projectile,...