A5049066461- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Magnetic confinement fusion research
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Laser-Matter Interactions and Applications
- Astro and Planetary Science
- High-pressure geophysics and materials
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Spectroscopy Techniques in Biomedical and Chemical Research
- Atomic and Molecular Physics
- Plasma Diagnostics and Applications
- Radiation Dose and Imaging
- Astrophysics and Star Formation Studies
- Welding Techniques and Residual Stresses
- Advanced Fiber Laser Technologies
- Electromagnetic Effects on Materials
- Solid State Laser Technologies
- Magnetic and Electromagnetic Effects
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Solid-state spectroscopy and crystallography
- Stellar, planetary, and galactic studies
- Additive Manufacturing Materials and Processes
University of California, San Diego
2022-2024
École Polytechnique
2016-2022
Laboratoire pour l'utilisation des lasers intenses
2016-2022
Centre National de la Recherche Scientifique
2016-2022
Sorbonne Université
2016-2022
CEA Paris-Saclay
2016-2022
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2022
Université Paris 1 Panthéon-Sorbonne
2021
Université Paris-Saclay
2016-2019
Institute of Applied Physics
2019
Radiochromic films (RCF) are commonly used in dosimetry for a wide range of radiation sources (electrons, protons, and photons) medical, industrial, scientific applications. They multi-layered, which includes plastic substrate layers sensitive that incorporate radiation-sensitive dye. Quantitative dose can be retrieved by digitizing the film, provided prior calibration exists. Here, to calibrate newly developed EBT3 HDv2 RCFs from Gafchromic™, we Stanford Medical LINAC deposit various doses...
Laser plasma amplification of sub-picosecond pulses above the Joule level is demonstrated, a major milestone for this scheme to become solution next-generation ultra-high intensity lasers. By exploring over 6 orders magnitude influence incident seed on Brillouin laser amplification, we reveal importance minimum ensure an early onset self-similar regime, and large energy transfer with very high efficiency, up 20%. Evidence losses by spontaneous backward Raman found at amplification. The first...
We analyze, using experiments and 3D MHD numerical simulations, the dynamic radiative properties of a plasma ablated by laser (1 ns, 10[Formula: see text]-10[Formula: text] W/cm[Formula: text]) from solid target as it expands into homogeneous, strong magnetic field (up to 30 T) that is transverse its main expansion axis. find early 2 ns after start expansion, becomes constrained field. As strength increased, more confined close heated compression. also observe [Formula: being overall shaped...
Laser-driven neutron sources could offer a promising alternative to those based on conventional accelerator technologies in delivering compact beams of high brightness and short duration. We examine this through particle-in-cell Monte Carlo simulations that model, respectively, the laser acceleration protons from thin-foil targets their subsequent conversion into neutrons secondary lead targets. Laser parameters relevant 0.5 PW LMJ-PETAL 0.6–6 Apollon systems are considered. Owing its...
Abstract Magnetic reconnection can occur when two plasmas, having anti-parallel components of the magnetic field, encounter each other. In plane, component field is annihilated and its energy released in plasma. Here, we investigate through laboratory experiments between flux tubes that are not strictly anti-parallel. Compression observed, as well a decrease efficiency. Concomitantly, observe delayed plasma heating enhanced particle acceleration. Three-dimensional hybrid simulations support...
Collisionless shocks are ubiquitous in the Universe and held responsible for production of nonthermal particles high-energy radiation. In absence particle collisions system, theory shows that interaction an expanding plasma with a pre-existing electromagnetic structure (as our case) is able to induce energy dissipation allow shock formation. Shock formation can alternatively take place when two plasmas interact, through microscopic instabilities inducing fields turn mediate Using platform...
Laser irradiation of solid targets can drive short and high-charge relativistic electron bunches over micron-scale acceleration gradients. However, for a long time, this technique was not considered viable means due to the large intrinsic divergence (∼50° half-angle) electrons. Recently, reduction in 10°–20° half-angle has been obtained, using plasma-based magnetic fields or very high contrast laser pulses extract electrons into vacuum. Here we show that further improve beam collimation,...
Abstract The interaction of an intense laser with a solid foil target can drive $$\sim$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>∼</mml:mo> </mml:math> TV/m electric fields, accelerating ions to MeV energies. In this study, we experimentally observe that structured targets dramatically enhance proton acceleration in the normal sheath regime. At Texas Petawatt Laser facility, compared from $$1\, {\upmu }\hbox {m}$$ <mml:mrow> <mml:mn>1</mml:mn> <mml:mspace/>...
Investigating in the laboratory process of matter accretion onto forming stars through scaled experiments is important order to better understand star and planetary systems formation evolution. Such can indeed complement observations by providing access processes with spatial temporal resolution. A first step has been made [G. Revet et al., Science Advances 3, e1700982 (2017), arXiv:1708.02528]. allowing such investigations. It revealed existence a two components stream: hot shell...
Laser-plasma instabilities (LPI) play a detrimental role in energy coupling to the target inertial confinement fusion (ICF). The recent development of applied strong magnetic fields for use ICF and laboratory astrophysics experiments has opened opportunities investigate external on LPIs. Recent numerical studies have shown that stimulated Raman scattering (SRS) can be mitigated by kinetic regime instability warrant systematic experimental validate modelling. To this end, we design at...
The collisionless ion-Weibel instability is a leading candidate mechanism for the formation of shocks in many astrophysical systems, where typical distance between particle collisions much larger than system size. Multiple laboratory experiments aimed at studying this process utilize laser-driven (I≳10^{15} W/cm^{2}), counterstreaming plasma flows (V≲2000 km/s) to create conditions unstable Weibel-filamentation and growth. This technique intrinsically produces temporally varying midplane...
We present an experimental investigation of the formation stage a collisionless shock when flow velocity is aligned with ambient magnetic field utilizing laser-driven, super-Alfvénic plasma flows. As flows interact, electromagnetic streaming instabilities develop. Proton deflectometry used to visualize these fluctuations indicating development ion-Weibel instability and nonresonant instability. Hybrid simulations also show growth suggest that it provides efficient source dissipation for shock.
<title>Abstract</title> The warm dense matter (WDM) is an exotic state of encountered in inertial confinement implosions for fusion energy, as well the interiors giant planets like Jupiter, brown dwarfs, atmospheres white neutron star crusts, and newly discovered exo-planets. One efficient way to create WDM use protons accelerated by a high-intensity short-pulse laser isochorically heat samples states. Despite its importance, direct temperature measurements within targets are scarce. This...
Magnetic reconnection occurs when two plasmas having co-planar but anti-parallel magnetic fields meet. At the contact point, field is locally annihilated and energy can be released into surrounding plasma. Theory numerical modelling still face many challenges in handling this complex process, predictability of which remains elusive. Here we test, through a laboratory experiment conducted controlled geometry, effect changing topology from two-dimensional to three-dimensional. This done by...
The present work is aimed at the experimental study of dynamics laser-induced plasma immersed in a strong poloidal magnetic field with variable orientation ( <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$0^{\circ}-90^{\circ}$</tex> depending on expansion) and amplitude (up to 30 T). significance such studies especially important for tasks laboratory astrophysics inertial confinement fusion. Electron density temperature profiles are measured,...
Due to their high cost of acquisition and operation, there are still a limited number high-yield, high-flux neutron source facilities worldwide. In this context, laser-driven sources offer promising, cheaper alternative those based on large-scale accelerators, with, in addition, the potential generating compact beams brightness ultra-short duration. particular, predicted capability next-generation petawatt (PW)-class lasers accelerate protons beyond 100 MeV range should unlock efficient...
We analyze, using experiments and 3D MHD numerical simulations, the dynamics radiative properties of a plasma ablated by laser (1 ns, 10$^{12}$-10$^{13}$ W/cm$^2$) from solid target, as it expands into homogeneous, strong magnetic field (up to 30 T) transverse its main expansion axis. find that soon 2 ns after start expansion, becomes constrained field. As strength is increased, more confined close target heated compression. also observe dense slab rapidly vacuum ~ 8 ns; however, this...