A5041101246- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Laser-Plasma Interactions and Diagnostics
- Quantum Chromodynamics and Particle Interactions
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Particle Detector Development and Performance
- Laser Design and Applications
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- High-pressure geophysics and materials
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Nuclear Physics and Applications
- Laser Material Processing Techniques
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Ion-surface interactions and analysis
- Atomic and Molecular Physics
- Advanced Fiber Laser Technologies
- Neutrino Physics Research
- Advanced X-ray Imaging Techniques
- Quantum, superfluid, helium dynamics
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Electron Microscopy Techniques and Applications
École Nationale Supérieure de Techniques Avancées
2016-2025
Institut de Recherche sur les Lois Fondamentales de l'Univers
2016-2025
CEA Paris-Saclay
2016-2025
École Polytechnique
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2025
Laboratoire d'Optique Appliquée
2016-2025
Université Paris-Saclay
2016-2025
Sophia Genetics (France)
2025
Institute of High Energy Physics
2024
Abstract Plasma-based accelerators use the strong electromagnetic fields that can be supported by plasmas to accelerate charged particles high energies. Accelerating field structures in plasma generated powerful laser pulses or particle beams. This research has recently transitioned from involving a few small-scale efforts development of national and international networks scientists substantial investment large-scale infrastructure. In this New Journal Physics 2020 Plasma Accelerator...
Coherent radiation in the 0.3-3 THz range has been generated from femtosecond electron bunches at a plasma-vacuum boundary via transition radiation. The produced by laser-plasma accelerator contained 1.5 nC of charge. energy per pulse within limited 30 mrad collection angle was 3-5 nJ and scaled quadratically with bunch charge, consistent coherent emission. Modeling indicates that this broadband source produces about 0.3 microJ 100 angle, increasing transverse plasma size beam could provide...
An electron beam from a laser-plasma accelerator is converted into gamma-ray source using bremsstrahlung radiation in dense material. The has pointlike size because it generated by high quality with small and low divergence. Using this source, the radiography of complex objects submillimeter resolution performed. It first evidence few hundreds micrometers produced laser-driven accelerators. This consistent results Monte Carlo simulations.
The interaction of short and intense laser pulses with plasmas is a very efficient source relativistic electrons tunable properties. In low-density plasmas, we observed bunches up to 200 MeV, accelerated in the wakefield pulse. Less energetic (tens megaelectronvolt) have been obtained, albeit higher efficiency, during pre-exploded foil or solid target. When these slow down thick tungsten target, they emit Bremsstrahlung photons which diagnosed directly photoconductors, indirectly through...
To take full advantage of a laser-plasma accelerator, stability and control the electron beam parameters have to be achieved. The external injection scheme with two colliding laser pulses is way stabilize electrons into plasma wave, easily tune energy output by changing longitudinal position injection. In this Letter, it shown that tuning optical parameters, one able phase-space volume injected particles, thus charge spread beam. With method, production accelerated 10 pC at 200 MeV level 1%...
Abstract The development of ultra-intense and ultra-short light sources is currently a subject intense research driven by the discovery novel phenomena in realm relativistic optics, such as production ultrafast energetic particle radiation beams for applications. It has been long-standing challenge to unite two hitherto distinct classes sources: those achieving intensity with pulse durations approaching single cycle. While former class traditionally involves large-scale amplification chains,...
The effect of asymmetric laser pulses on electron yield from a wakefield accelerator has been experimentally studied using >10(19) cm(-3) plasmas and 10 TW, >45 fs, Ti:Al2O3 laser. pulse shape was controlled through nonlinear chirp with grating pair compressor. Pulses (76 fs FWHM) steep rise positive were found to significantly enhance the compared gentle negative chirp. Theory simulation show that fast rising can generate larger amplitude wakes seed growth self-modulation instability,...
An absolute measurement of ${\ensuremath{\pi}}^{0}$ photoproduction on the proton has been carried out in threshold region (from 144.7 to 173 MeV) by use tagged annihilation photons. The measured cross sections, differential recoiling-proton energy, are used perform a multipole analysis which gives value , disagreement with low-energy-theorem predictions. Total sections and coefficients angular distribution presented.
This article gives a detailed description of single shot electron spectrometer which was used to characterize beams produced by laser-plasma interaction. Contrary conventional sources, from accelerators can produce broad range energies. Therefore, diagnosing these spectra requires specific attention and experimental development. Here, we provide an absolute calibration the Lanex Kodak Fine screen on laser-triggered radio frequency picosecond accelerator. The efficiency scintillating screens...
We have measured the temporal shortening of an ultraintense laser pulse interacting with underdense plasma. When strongly nonlinear plasma waves, is shortened from 38 +/- 2 fs to 10-14 level, a 20% energy efficiency. The ponderomotive force excites wakefield, which, along relativistic self-phase modulation, broadens spectrum and subsequently compresses pulse. This mechanism confirmed by 3D particle in cell simulations.
The injection of quasimonoenergetic electron beams into a laser wakefield accelerator is demonstrated experimentally using density gradients at the edges plasma channel. In experiment, two pulses are used; main pulse drives wakefield, while second countercrossing beam produces whose expansion creates channel with significant gradients. Local electrons in triggered by wave breaking ramp. localized spatially and leads to generation collimated narrow energy spread relativistic 100 MeV level,...
A novel experimental apparatus for time and angle-resolved photoemission on solid surfaces is presented. 6.28 eV laser source operating at 250 kHz repetition rate obtained by frequency mixing in nonlinear beta barium borate crystals. This UV light has a high photon flux of 1013 photons/s with relatively low number photons/pulse so that Fermi surface mapping over wide region the Brillouin zone possible while mitigating space charge effects. The been fully characterized spatially, spectrally,...
We investigate the temporal evolution of electronic states at bismuth (111) surface by means time- and angle-resolved photoelectron spectroscopy. The binding energy bulklike bands oscillates with frequency ${A}_{1g}$ phonon mode, whereas are insensitive to coherent displacement lattice. A strong dependence oscillation amplitude on wave vector is correctly reproduced ab initio calculations electron-phonon coupling. Besides these oscillations, all also display a photoinduced shift towards...
We report on an experimental demonstration of laser wakefield electron acceleration using a sub-TW power by tightly focusing 30-fs pulses with only 8 mJ pulse energy 100 \mu m scale gas target. The experiments are carried out at unprecedented 0.5 kHz repetition rate, allowing "real time" optimization accelerator parameters. Well-collimated and stable beams quasi-monoenergetic peak in excess keV measured. Particle-in-cell simulations show excellent agreement the results suggest mechanism...
We report on the stable and continuous operation of a kilohertz laser-plasma accelerator. Electron bunches with 2.6 pC charge 2.5 MeV peak energy were generated via injection trapping in downward plasma density ramp. This transition was produced newly designed asymmetrically shocked gas nozzle. The reproducibility electron source also assessed over period week found to be satisfactory similar values beam energy. These results show that stability accelerator are greatly enhanced long-term...
Magnetic fields in excess of 7 MG have been measured with high spatial and temporal precision during interactions a circularly polarized laser pulse an underdense helium plasma at intensities up to $1\ifmmode\times\else\texttimes\fi{}{10}^{19}\mathrm{W}{\mathrm{cm}}^{\ensuremath{-}2}$. The fields, while the form expected from inverse Faraday effect for cold plasma, are much larger than expected, duration approaching that intensity ( $<3\mathrm{psec}$). These observations can be explained by...