A5080807402- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Atomic and Molecular Physics
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Particle Accelerators and Free-Electron Lasers
- High-pressure geophysics and materials
- Particle accelerators and beam dynamics
- Advanced X-ray Imaging Techniques
- Laser Material Processing Techniques
- Particle Detector Development and Performance
- Advanced Fiber Laser Technologies
- Dust and Plasma Wave Phenomena
- Advanced Surface Polishing Techniques
- Solid State Laser Technologies
- Pulsed Power Technology Applications
- Gyrotron and Vacuum Electronics Research
- X-ray Spectroscopy and Fluorescence Analysis
- Ionosphere and magnetosphere dynamics
- Geophysics and Sensor Technology
- Ocular and Laser Science Research
- Diamond and Carbon-based Materials Research
- Ion-surface interactions and analysis
Laboratoire de Physique des Gaz et des Plasmas
2014-2025
Centre National de la Recherche Scientifique
2014-2024
Université Paris-Saclay
2009-2024
Université Paris-Sud
2011-2020
Lund University
2014
Laboratoire de physique des lasers
2011
GSI Helmholtz Centre for Heavy Ion Research
2010
École Polytechnique
1992-2010
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2010
Johannes Gutenberg University Mainz
2010
The acceleration of electrons injected in a plasma wave generated by the laser wakefield mechanism has been observed. A maximum energy gain 1.6 MeV measured and longitudinal electric field is estimated to 1.5 GV/m. experimental data agree with theoretical predictions when 3D effects are taken into account. duration inferred from number accelerated order 1 ps.
Abstract This report presents the conceptual design of a new European research infrastructure EuPRAXIA. The concept has been established over last four years in unique collaboration 41 laboratories within Horizon 2020 study funded by Union. EuPRAXIA is first project that develops dedicated particle accelerator based on novel plasma acceleration concepts and laser technology. It focuses development electron accelerators underlying technologies, their user communities, exploitation existing...
The Horizon 2020 Project EuPRAXIA ("European Plasma Research Accelerator with eXcellence In Applications") is preparing a conceptual design report of highly compact and cost-effective European facility multi-GeV electron beams using plasma as the acceleration medium. accelerator will be based on laser and/or beam driven approach used for photon science, high-energy physics (HEP) detector tests, other applications such X-ray sources medical imaging or material processing. started in November...
Monomode guiding over 100 Rayleigh lengths (10 cm) of high intensity ultrashort laser pulses ( ${10}^{16}\mathrm{W}/{\mathrm{cm}}^{2}$, 120 fs) has been demonstrated in hollow dielectric capillary tubes (45--70 \ensuremath{\mu}m internal diameter) without inner wall damage. Analytical predictions for coupling conditions and damping length are confirmed experimentally under vacuum. With 5 to 40 mbar He gas the tube, when ionization occurs energy duration transmitted pulse decrease while its...
We present an alternative explanation of the high-order-harmonic-generation experimental results published recently by Seres et al. [Nature Phys. 6, 455 (2010)]. show that physical interpretation can be comprehensively done in frame classical theory high-order harmonic generation without referring to a parametric effect XUV domain. The conditions explored indeed correspond case long-pulse, low-infrared-energy laser beams for which tight focusing is necessary reach minimum intensity required...
This document outlines a community-driven Design Study for 10 TeV pCM Wakefield Accelerator Collider. The 2020 ESPP Report emphasized the need Advanced R\&D, and 2023 P5 calls ``delivery of an end-to-end design concept, including cost scales, with self-consistent parameters throughout." leverages recent experimental theoretical progress resulting from global R\&D program in order to deliver unified, Collider concept. Accelerators provide ultra-high accelerating gradients which enables...
An electron beam has been accelerated in a plasma wave generated by the laser beat-wave method. The beating of two Nd-laser pulses at wavelengths close to 1 $\ensuremath{\mu}$m creates relativistic deuterium plasma. Electrons injected an energy 3 MeV are observed be up 3.7 after gain is compatible with peak electric field order 0.6 GV/m, agreement model predictions. experimental setup and main results presented.
By tailoring the wavefront of laser pulse used in a laser-wakefield accelerator, we show that properties x-rays produced due to electron beam’s betatron oscillations plasma can be controlled. creating with coma, find critical energy synchrotronlike x-ray spectrum significantly increased. The coma does not substantially change beam, but increase its divergence and produces an energy-dependent exit angle, indicating changes are beam's oscillation amplitude within wakefield.
Abstract Laser-plasma accelerators are capable of sustaining accelerating fields 10–100 GeV/m, 100–1000 times that conventional technology and the highest produced by any widely researched advanced accelerator concepts. also intrinsically accelerate short particle bunches, several orders magnitude shorter than technology, which leads to reductions in beamstrahlung and, hence, savings overall power consumption reach a desired luminosity. These properties make laser-plasma promising for more...
The properties of the eigenmodes a capillary tube are examined in context ultrashort intense laser pulse guiding. dispersion relation for cylindrical hollow waveguide is derived and family EH(nus) shown to be solution wave equation up first order under condition k(0)a >>1, where k(0) light number radius. expressions fields given at zero small parameter equal ratio perpendicular longitudinal absorbed intensity wall estimated.
We describe the first demonstration of a collisionally excited optical-field-ionization laser driven within waveguide. Lasing on $4{d}^{9}5d\mathrm{\text{\ensuremath{-}}}4{d}^{9}5p$ transition at 41.8 nm in ${\mathrm{X}\mathrm{e}}^{8+}$ was observed to be closely correlated conditions under which pump pulses were guided well by gas-filled capillary discharge Simulations propagation radiation show that gain achieved over essentially whole 30 mm length
The modulational instability of the high-phase-velocity plasma wave generated by a Nd-laser beat has been observed for first time. Both ion and electron waves are detected when density is close to resonant which frequency equal difference between two pump lasers. We also detect presence harmonics signature high-amplitude perturbations.
Recent experiments [F. Dorchies et al., Phys. Rev. Lett. 82, 4655 (1999)] have demonstrated monomode guiding over 100 Rayleigh lengths (10 cm) of high intensity, ultrashort laser pulses in a dielectric capillary tube filled with low pressure He gas. A model for the propagation femtosecond tube, coupled tunnel ionization gas filling is derived and solved numerically using parameters these experiments. The simulations accurately reproduce experimentally measured damping lengths, transmitted...
This document provides detailed information on the status of Advanced and Novel Accelerators techniques describes steps that need to be envisaged for their implementation in future accelerators, particular high energy physics applications. It complements overview prepared update European Strategy particle physics, a description field. The scientific priorities community are described each technique acceleration able achieve accelerating gradient GeV~range or above. ALEGRO working group...
By seeding an optical-field-ionized population-inverted plasma amplifier with the 25th harmonic of IR laser, we have achieved what believe to be first aberration-free laser beam in soft x-ray spectral range. This emits within a cone 1.34 mrad(1/e(2)) at repetition rate 10 Hz central wavelength 32.8 nm. The exhibits circular profile and wavefront distortions as low lambda/17. A theoretical analysis these results shows that this high quality is due spatial filtering seed by aperture.
Experimental results, supported by precise modeling, demonstrate optimization of a plasma-based injector with intermediate laser pulse energy ($<1\text{ }\text{ }\mathrm{J}$), corresponding to normalized vector potential ${a}_{0}=2.15$, using ionization injection in tailored plasma density profile. An increase electron bunch quality and is achieved experimentally the extension downramp at exit. Optimization focal position profile shown efficiently reduce angular deviation, leading better...
Electron acceleration by laser-plasma techniques is approaching maturity and getting ready for the construction of particle accelerators with dedicated applications. We present a general methodology showing how beam physics studies can be used to achieve specific parameter set in accelerator. Laser systems, plasma targets, magnetic component properties are designed optimize electron so as required performances. Beam its full 6D phase space studied from injection delivery end user, through...
An electron plasma wave (EPW) has been excited by a short laser pulse (5 J, 400 fs) via the wakefield (LWF) mechanism. At LWF quasi-resonance condition, 3 MeV injected electrons have accelerated with maximum energy gain of 1.5 MeV. The longitudinal electric field is estimated to be GV/m. It observed that deflected during interaction, can scatter on walls experimental chamber and fake high signal. A special effort given in detection separate signal from background noise. data are confirmed...
The structure of the wakefield is studied in a plasma column, created by monomode laser pulse propagating capillary tube, filled with gas affected tunneling ionization. Linear analytical considerations as well self-consistent numerical simulations show that central bulk part column where intensity exceeds ionization threshold, similar to an infinite homogeneous plasma. Near wall decreases below threshold and density falls zero, curvature wave phase front increases distance from pulse,...
We report on experimental and theoretical studies of a collisionally pumped, optical-field-ionized soft-x-ray laser (SXRL) at $41.8\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ driven in capillary tubes with smooth inner surface. A detailed study has been conducted order to understand the key effects related guiding this configuration. The amplifying plasma was created inside few-cm-long tubes, maximum extreme ultraviolet emission obtained when operating multimode regime an optimized lasing signal...
The excitation of plasma waves over a length up to 8 cm is demonstrated using laser guiding intense pulses through hydrogen-filled glass capillary tubes. are diagnosed by spectral analysis the transmitted radiation. dependence redshift---measured as function filling pressure, tube length, and incident energy---is in excellent agreement with simulation results. longitudinal accelerating field inferred from simulations range 1--10 GV/m.
We present the first direct measurement of time evolution gain a soft x-ray laser amplifier. The is based on injection seed pulse, obtained by high-order harmonic generation, into an medium. Strong amplification occurs when pulse synchronized with period. By precisely varying delay between plasma creation and injection, actual temporal amplifier subpicosecond resolution.
We present what we believe to be the first measurement of spectral properties a soft x-ray laser seeded by high-order harmonic beam. Using an interferometric method, profile Ni-like krypton (32.8 nm) generated optical field ionization has been experimentally determined, and shortest possible pulse duration deduced. The source exhibits Voigt with FWHM 3.1+/-0.3 mA, leading Fourier-transform 4.7 ps. This value is comparable upper limit determined investigating gain dynamics, from which...