A5054381719- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- Laser-Plasma Interactions and Diagnostics
- Laser-Matter Interactions and Applications
- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Laser Design and Applications
- High-pressure geophysics and materials
- Ion-surface interactions and analysis
- Laser Material Processing Techniques
- Diamond and Carbon-based Materials Research
- Plasma Diagnostics and Applications
- Mass Spectrometry Techniques and Applications
- Nuclear Physics and Applications
- Advanced Electron Microscopy Techniques and Applications
- Advanced Chemical Physics Studies
- Solid State Laser Technologies
- Integrated Circuits and Semiconductor Failure Analysis
- Near-Field Optical Microscopy
- Crystallography and Radiation Phenomena
- Particle Accelerators and Free-Electron Lasers
- Astro and Planetary Science
- Radiation Detection and Scintillator Technologies
- Magnetic confinement fusion research
- Surface Roughness and Optical Measurements
Osaka University
2009-2022
Joint Institute for High Temperatures
2012-2022
Nagoya University
2022
Roche (France)
2022
Centre National de la Recherche Scientifique
2022
Observatoire de Paris
2022
Sorbonne Université
2022
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2022
École Polytechnique
2022
Université Paris Sciences et Lettres
2022
Although bipolar jets are seen emerging from a wide variety of astrophysical systems, the issue their formation and morphology beyond launching is still under study. Our scaled laboratory experiments, representative young stellar object outflows, reveal that stable narrow collimation entire flow can result presence poloidal magnetic field whose strength consistent with observations. The plasma becomes focused an interior cavity. This gives rise to standing conical shock which jet emerges....
An approach for accelerating ions, with the use of a cluster-gas target and an ultrashort pulse laser 150-mJ energy 40-fs duration, is presented. Ions 10--20 MeV per nucleon having small divergence (full angle) 3.4\ifmmode^\circ\else\textdegree\fi{} are generated in forward direction, corresponding to approximately tenfold increase ion energies compared previous experiments using solid targets. It inferred from particle-in-cell simulation that high ions at rear side due formation strong...
X-ray spectroscopy with high spectral (up to Δλ/λ = 10−4) and spatial resolution 1 μm) is discussed. Devices based on crystals, diffraction Bragg-Fresnel elements their applications in Z- X-pinches laser plasma experiments are described.
Laser light reflection by a relativistically moving electron density modulation (flying mirror) in wake wave generated plasma high intensity laser pulse is investigated experimentally. A counterpropagating reflected and upshifted frequency with multiplication factor of 37--66, corresponding to the extreme ultraviolet wavelength. The demonstrated flying mirror reflectivity (from $3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$...
Almost fully stripped Fe ions accelerated up to 0.9 GeV are demonstrated with a 200 TW femtosecond high-intensity laser irradiating micron-thick Al foil impurity on the surface. An energetic low-emittance high-density beam of heavy large charge-to-mass ratio can be obtained, which is useful for many applications, such as compact radio isotope source in combination conventional technology.
In this paper, high temperature (~10 keV) solid density silver plasma is generated experimentally by exposing a thin foil to the extreme fields of tightly focused high-power laser. The authors demonstrate that such an efficient source highly charged, energy heavy ions, with generation ultra-strong electric
Abstract This article reports on the utilization of X‐ray microradiography and laser induced breakdown spectroscopy (LIBS) techniques for investigation metal accumulation in different part leaf samples. The potential LIBS‐analysis finding proper plant species phytoremediation is compared with results measurements at HERCULES source ENEA, Rome (Italy) experiments ELETTRA Synchrotron, Trieste (Italy). Microsc. Res. Tech., 2007. © 2006 Wiley‐Liss, Inc.
We demonstrate a new high-order harmonic generation mechanism reaching the "water window" spectral region in experiments with multiterawatt femtosecond lasers irradiating gas jets. A few hundred orders are resolved, giving μJ/sr pulses. Harmonics collectively emitted by an oscillating electron spike formed at joint of boundaries cavity and bow wave created relativistically self-focusing laser underdense plasma. The sharpness stability explained catastrophe theory. is corroborated...
The results are given of the observations, in 2–19-Å wavelength range, spectral lines emitted from laser plasmas hydrogen- and helium-like ions Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, V (Z = 11–23, ionization potentials up to 6.86 keV). Transitions
The understanding of fracture phenomena a material at extremely high strain rates is key issue for wide variety scientific research ranging from applied science and technological developments to fundamental such as laser-matter interaction geology. Despite its interest, study relies on fine multiscale description, in between the atomic scale macroscopic processes, so far only achievable by large-scale simulations. Direct ultrafast real-time monitoring dynamic (spallation) lattice with...
Acceleration of particles from the interaction ultraintense laser pulses up to 5×10^{21} W cm^{-2} with thin foils is investigated experimentally. The electron beam parameters varied decreasing spot size, not just intensity, resulting in reduced temperatures and divergence. In particular, temperature saturated due insufficient acceleration length tightly focused spot. These dependencies affected sheath-accelerated protons, which showed poorer spot-size scaling than widely used laws. It...
The use of lithium fluoride (LiF) crystals and films as imaging detectors for EUV soft-x-ray radiation is discussed. or can generate stable color centers, emitting in the visible spectral range an intense fluorescence from exposed areas. high dynamic response material to received dose atomic scale centers make this detector extremely interesting at a spatial resolution which be much smaller than light wavelength. Experimental results contact microscopy test meshes demonstrate order 400nm....
A new diagnostic method for dense plasmas, monochromatic x-ray backlighting, is described. In this method, shadow images of a bright, plasma can be obtained with high spatial resolution using radiation from separate plasma, permitting major reduction in the required backlighting source power. The object imaged utilizing spherically bent mica crystals as optical elements. Experimental results, namely test objects having different photon energies, are presented. Shadow exploding Al wire...
High energy heavy ions were generated in laser produced plasma at moderate energy, with a large focal spot size of 0.5 mm diameter. The beam was provided by the 10 GW GSI-NHELIX systems, and observed spectroscopically status nascendi high spatial spectral resolution. Due to geometry, jet formed, containing ions. velocity distribution measured via an observation Doppler shifted characteristic transition lines. up 3 MeV F-ions deviates order magnitude from well-known Gitomer (Gitomer et al. ,...
The compact multipulse terawatt (COMET) laser facility at LLNL was used to irradiate Al-coated 2-50 microm Ti foils with approximately 10(19) W cm(-2) , 500 fs, 3-6 J pulses. Laser-plasma interactions on the front side of target generate hot electrons sufficient energy excite inner-shell in Ti, creating Kalpha emission which has been measured using a focusing spectrometer spatial resolution aimed back surface targets. extent varies thickness. high spectral (lambda/Deltalambda equal 3800) is...
A novel mathematical model for the investigations of a cluster formation process in gas jet is presented, which enables us to obtain detailed description spatial and temporal distributions all target parameters. In this model, considered as two-phase medium, consisting continuous phase discrete condensed (clusters). The nozzle geometry also taken into account model. order confirm advantage present over conventional considerable amount numerical computations has been carried out results are...
X-ray spectroscopic methods for the determination of electron densities Ne>1020 cm-3 in plasmas with high temperatures (Te>or approximately=0.2 keV) are reviewed. The considered based on following measurements of: (i) relative intensities resonance and intercombination lines spectra He-like ions; (ii) satellite H-like (iii) doublet components; (iv) Stark broadening ions. All these have been used experiments plasma heating by focusing a laser beam plane massive targets containing elements...
The properties of high energy density plasma are under increasing scrutiny in recent years due to their importance our understanding stellar interiors, the cores giant planets$^{1}$, and hot inertial confinement fusion devices$^2$. When matter is heated by X-rays, electrons inner shells ionized before valence electrons. Ionization from inside out creates atoms or ions with empty internal electron shells, which known as hollow (or ions)$^{3,4,5}$. Recent advances free-electron laser (FEL)...
We show experimentally the possibility of nanostructuring (about 20 nm) gold surface by picosecond soft x-ray single pulse with low fluence ∼20 mJ/cm2. The nanometer-scale changes structure are due to splash molten under gradient laser beam. In addition, ablation process occurs at slightly higher ∼50 atomistic model is developed which reveals that threshold this build-up high electron pressure and comparatively electron-ion energy relaxation rate in gold. calculated depths as a function...
Abstract Here, we report, that by means of direct irradiation lithium fluoride a (LiF) crystal, in situ 3D visualization the SACLA XFEL focused beam profile along propagation direction is realized, including inside photoluminescence solid matter. High sensitivity and large dynamic range LiF crystal detector allowed measurements intensity distribution at distances far from best focus as well near evaluation source size quality factor M 2 . Our also support theoretical prediction for X-ray...
Ultrashort-pulse, laser-produced plasmas have become very interesting laboratory sources to study spectroscopically due their high densities and temperatures, the laser-induced electromagnetic fields present. Typically, these are of small volume low emissivity. Thus, studying near point source requires advanced experimental techniques. We present a new spectrometer design called focusing with spatial resolution (FSSR-2D) based on spherically bent crystal which provides simultaneous spectral...
In this Letter, laboratory astrophysical jet experiments performed with the LULI2000 laser facility are presented. High speed plasma jets ($150\text{ }\text{ }\mathrm{km}\ifmmode\cdot\else\textperiodcentered\fi{}{\mathrm{s}}^{\ensuremath{-}1}$) generated using foam-filled cone targets. Accurate experimental characterization of is by measuring its time evolution and exploring various target parameters. Key parameters such as propagation radial velocities, temperature, density obtained. For...
We have measured the polarization of $2{p}_{3∕2}\ensuremath{\rightarrow}1{s}_{1∕2}$ Lyman-${\ensuremath{\alpha}}_{1}$ x-ray line hydrogenlike ${\mathrm{Ar}}^{17+}$ and ${\mathrm{Fe}}^{25+}$ at electron-impact energies ranging from 7 to 25 threshold units. The highly charged argon iron ions were produced using Lawrence Livermore National Laboratory SuperEBIT electron beam ion trap. A combination two crystal spectrometers a microcalorimeter used record Lyman-$\ensuremath{\alpha}$ emission...
X-ray spectra of plasma produced by the interaction Ti:Sa laser pulses (duration from 60 fs to 1 ps, and energy 15 mJ 128 mJ) with foil solid Teflon AL targets are investigated. It is shown experimentally theoretically that use low contrast (10 −2 – 10 −4 ) short pulses, essentially promotes conditions for generation fast multi-charged ions. This effect caused self-focusing main pulse in a preplasma intense prepulses. Modeling observed spectral line shape gives evidence considerable (about...