A5013168606- High-pressure geophysics and materials
- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Astro and Planetary Science
- Diamond and Carbon-based Materials Research
- Atomic and Molecular Physics
- Planetary Science and Exploration
- Laser-Matter Interactions and Applications
- Geological and Geochemical Analysis
- Astrophysics and Star Formation Studies
- Gas Dynamics and Kinetic Theory
- X-ray Spectroscopy and Fluorescence Analysis
- Ion-surface interactions and analysis
- Laser Design and Applications
- Nuclear Physics and Applications
- Advanced X-ray Imaging Techniques
- Laser Material Processing Techniques
- Glass properties and applications
- Advanced Chemical Physics Studies
- Nuclear Engineering Thermal-Hydraulics
- Energetic Materials and Combustion
- Crystal Structures and Properties
- Scientific Measurement and Uncertainty Evaluation
- Graphite, nuclear technology, radiation studies
- Mineralogy and Gemology Studies
École Polytechnique
2015-2025
Laboratoire pour l'utilisation des lasers intenses
2014-2024
Centre National de la Recherche Scientifique
2014-2024
Sorbonne Université
2015-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2014-2024
CEA Paris-Saclay
2008-2021
Université Paris-Panthéon-Assas
2021
Osaka University
2009-2020
Université Paris-Saclay
2016-2020
Okayama University
2020
Laser driven proton beams have been used to diagnose transient fields and density perturbations in laser produced plasmas. Grid deflectometry techniques applied radiography obtain precise measurements of beam angles caused by electromagnetic Application implosions has demonstrated that conditions compressed media can be diagnosed with million electron volt protons. This data shown provide unique insight into super critical plasmas a perturbation diagnostics matter.
An experiment shows that equations of state solid matter at pressure $P=\phantom{\rule{0ex}{0ex}}$10--50 Mbar can be studied by using lasers with pulse energy $E\ensuremath{\approx}100\mathrm{J}$. Laser beams smoothed phase-zone plates produced high quality, planar shock waves in two-step, two-material targets, allowing simultaneous measurements the velocities two materials. By use impedance-matching technique, relative consistency these materials tested, or a equation data measured....
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...
We report an experimental study of the phase diagrams periclase (MgO), enstatite (MgSiO3) and forsterite (Mg2SiO4) at high pressures. investigated with laser driven decaying shocks pressure/temperature curves MgO, MgSiO3 Mg2SiO4 between 0.2-1.2 TPa, 0.12-0.5 TPa 0.2-0.85 respectively. A melting signature has been observed in MgO 0.47 9860 K, while no changes were neither nor Mg2SiO4. An increasing reflectivity liquids have detected 0.55 -12 760 0.15 - 7540 0.2 5800 In contrast to SiO2,...
We present a supercritical radiative shock experiment performed with the LULI nanosecond laser facility. Using targets filled xenon gas at low pressure, propagation of strong precursor is evidenced. The main measured quantities (electronic density and velocity) are shown to be in good agreement theory numerical simulations.
Shock wave experiments have been performed at the Laboratoire pour l'Utilisation des Lasers Intenses in a regime of interest for inertial confinement fusion and equation state measurements. Laser beams optically smoothed either with random phase plates or phased zone plates. This last technique allowed production flat-top intensity distribution focal spot hence flat shock fronts. High quality shocks produced used stepped targets to allow direct measurements velocity by time-resolved imaging...
The optical reflectance of a strong shock front in water increases continuously with pressure above 100 GPa and saturates at ∼45% 250 GPa. This is the first evidence electronic conduction high water. In addition, Hugoniot equation state up to 790 (7.9 Mbar) determined from velocity measurements made by detecting Doppler shift reflected light. From fit data we find that an mobility gap ∼2.5 eV controls thermal activation carriers pressures range 100–150 suggests contributes significantly...
High quality shock waves with direct- and indirect-laser drive were generated. We used the phase zone plate smoothing technique in case of direct thermal x rays from laser heated cavities indirect drive. The possibility producing homogeneous, steady without significant preheating effects both methods has been proved. By using such shocks, copper equation state measurements have performed up to 40 Mbar, which was previously obtained only nuclear explosions. \textcopyright{} 1996 American...
We demonstrate here a laser-driven shock wave in hydrogen sample, pre-compressed diamond anvil cell. The compression factors of the dynamic and static techniques are multiplied. This approach allows access to family Hugoniot curves which span P–T phase diagram fluid high density. In this first-of-its-kind experiment, two have been partially followed starting from pre-compression at pressures 0.7 GPa 1.2 GPa. Optical reflectance probing wavelengths reveals onset conducting state. boundary...
We present experimental and numerical results on the propagation energy deposition of laser-generated fast electrons into conical targets. The first part reports measurements performed in various configurations order to assess predicted benefit targets over standard planar ones. For conditions investigated here, electron-induced heating is found be much weaker cone-guided irradiated at a laser wavelength 1.057μm, whereas frequency doubling pulse permits us bridge disparity between This...
The electronic structure evolution of highly compressed aluminum has been investigated using time resolved $K$ edge x-ray absorption spectroscopy. A long laser pulse (500 ps, ${I}_{L}\ensuremath{\approx}8\ifmmode\times\else\texttimes\fi{}{10}^{13}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$) was used to create a uniform shock. second ps (${I}_{L}\ensuremath{\approx}{10}^{17}\text{ generated an ultrashort broadband source near the Al edge. main target designed probe at reshocked conditions...
Abstract Understanding Warm Dense Matter (WDM), the state of planetary interiors, is a new frontier in scientific research. There exists very little experimental data probing WDM states at atomic level to test current models and those performed up now are limited quality. Here, we report proof-of-principle experiment that makes microscopic investigations materials under dynamic compression easily accessible users with quality close achievable ambient. Using single 100 ps synchrotron x-ray...
Taking advantage of the new opportunities provided by x-ray free electron laser (FEL) sources when coupled to a long pulse as available at Linear Coherent Light Source (LCLS), we have performed absorption near-edge spectroscopy (XANES) shock compressed iron up 420 GPa ($\ifmmode\pm\else\textpm\fi{}50$) and 10 800 K ($\ifmmode\pm\else\textpm\fi{}1390$). Visible diagnostics with hydrodynamic simulations were used infer thermodynamical conditions along Hugoniot release adiabat. A modification...
We present measurements on <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>Fe</a:mi><a:mn>2</a:mn></a:msub><a:msub><a:mi mathvariant="normal">O</a:mi><a:mn>3</a:mn></a:msub></a:mrow></a:math> amorphization and melt under laser-driven shock compression up to 209(10) GPa via time-resolved x-ray diffraction. At 122(3) GPa, a diffuse signal is observed indicating the presence of noncrystalline phase. Structure factors have been extracted 182(6) showing two well-defined...
We report experimental data on the equation of state gold in pressure range 2--10 TPa obtained using laser-driven shock waves. The experiments have been realized an iodine high-power laser with subnanosecond pulses and techniques like phase zone plates hohlraums to produce spatially uniform shocks. Our are compared existing models.
Laser-driven shock compression of samples precompressed to 1 GPa produces high-pressure-temperature conditions inducing two significant changes in the optical properties water: onset opacity followed by enhanced reflectivity initially transparent water. The at infrared wavelengths can be interpreted as a semiconductor<-->electronic conductor transition water, and is found pressures above approximately 130 for single-shocked GPa. Our results indicate that conductivity deep interior "icy"...
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...
We present an ab initio study of MgO at high temperature and pressure, around the phase transition between B1 B2 phases. By means molecular dynamic calculations, thermal evolution vibrational properties thermodynamic quantities is obtained. carefully compare our results with previous theoretical works on curve we analyze differences among them. show that anharmonic effects have been underestimated in quasiharmonic approximation their inclusion free energy strongly straightens up curve. Then,...
Ammonia is predicted to be one of the major components in depths ice giant planets Uranus and Neptune. Their dynamics, evolution, interior structure are insufficiently understood models rely imperatively on data for equation state transport properties. Despite its great significance, experimentally accessed region ammonia phase diagram today still very limited pressure temperature. Here we push probed regime unprecedented conditions, up $\ensuremath{\sim}350\text{ }\text{ }\mathrm{GPa}$...
X-ray free electron laser (XFEL) sources coupled to high-power systems offer an avenue study the structural dynamics of materials at extreme pressures and temperatures. The recent commissioning DiPOLE 100-X on high energy density (HED) instrument European XFEL represents state-of-the-art in combining x-ray diffraction with compression, allowing for compressed be probed unprecedented detail. Here, we report quantitative measurements molten Sn 85(5) GPa ∼3500 K. capabilities HED enable liquid...
We present equation of state points for iron, in the pressure range 10-45 Mbar, first obtained with laser-driven shock waves. The experiment has been performed high energy laser Phebus, optically smoothed Kinoform phase plates. Our results double set existing experimental data at very pressures showing good agreement predictions quotidian model and previous results.