A5046737636- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Particle Accelerators and Free-Electron Lasers
- Advanced X-ray Imaging Techniques
- Atomic and Molecular Physics
- Laser Design and Applications
- Ionosphere and magnetosphere dynamics
- Dust and Plasma Wave Phenomena
- Nuclear Physics and Applications
- Astrophysics and Cosmic Phenomena
- Magnetic confinement fusion research
- Ion-surface interactions and analysis
- Particle accelerators and beam dynamics
- Radiation Therapy and Dosimetry
- Gamma-ray bursts and supernovae
- Solar and Space Plasma Dynamics
- Plasma Diagnostics and Applications
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Astro and Planetary Science
- Crystallography and Radiation Phenomena
Queen's University Belfast
2016-2025
Florence (Netherlands)
2019
University of Castilla-La Mancha
2018
Centre of Plasma Physics - Institute for Plasma Research
2011-2018
Sapienza University of Rome
2010
École Polytechnique
2009-2010
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2010
CEA Paris-Saclay
2010
Centre National de la Recherche Scientifique
2010
University of Nevada, Reno
2010
The dynamics of energetic particles in strong electromagnetic fields can be heavily influenced by the energy loss arising from emission radiation during acceleration, known as reaction. When interacting with a high-energy electron beam, today's lasers are sufficiently intense to explore transition between classical and quantum reaction regimes. We present evidence collision an ultrarelativistic beam generated laser-wakefield acceleration (ϵ>500 MeV) laser pulse (a0>10). measure postcollision...
Abstract Electron–positron pair plasmas represent a unique state of matter, whereby there exists an intrinsic and complete symmetry between negatively charged (matter) positively (antimatter) particles. These play fundamental role in the dynamics ultra-massive astrophysical objects are believed to be associated with emission ultra-bright gamma-ray bursts. Despite extensive theoretical modelling, our knowledge this matter is still speculative, owing extreme difficulty recreating neutral...
Substantial energy loss in an electron beam passing through a high-intensity laser provides clear evidence of the radiation reaction, shedding light on how electrons interact with extreme electromagnetic fields.
We report on the generation of a narrow divergence (${\ensuremath{\theta}}_{\ensuremath{\gamma}}<2.5\text{ }\text{ }\mathrm{mrad}$), multi-MeV (${E}_{\mathrm{max}}\ensuremath{\approx}18\text{ }\mathrm{MeV}$) and ultrahigh peak brilliance ($>1.8\ifmmode\times\else\texttimes\fi{}{10}^{20}\text{ }\mathrm{photons}\text{ }{\mathrm{s}}^{\ensuremath{-}1}\text{ }{\mathrm{mm}}^{\ensuremath{-}2}\text{ }{\mathrm{mrad}}^{\ensuremath{-}2}$ 0.1% BW) $\ensuremath{\gamma}$-ray beam from scattering an...
The acceleration of ions from ultrathin foils has been investigated by using 250 TW, subpicosecond laser pulses, focused to intensities up $3\ifmmode\times\else\texttimes\fi{}{10}^{20}\text{ }\text{ }\mathrm{W}\text{ }{\mathrm{cm}}^{\ensuremath{-}2}$. ion spectra show the appearance narrow-band features for protons and carbon peaked at higher energies (in $5--10\text{ }\mathrm{MeV}/\mathrm{\text{nucleon range}}$) with significantly flux than previously reported. spectral their scaling target...
Abstract This Conceptual Design Report describes LUXE (Laser Und XFEL Experiment), an experimental campaign that aims to combine the high-quality and high-energy electron beam of European with a powerful laser explore uncharted terrain quantum electrodynamics characterised by both high energy intensity. We will reach this hitherto inaccessible regime physics analysing electron-photon photon-photon interactions in extreme environment provided intense focus. The background its relevance are...
The generation of ultrarelativistic positron beams with short duration (τ(e+) ≃ 30 fs), small divergence (θ(e+) 3 mrad), and high density (n(e+) 10(14)-10(15) cm(-3)) from a fully optical setup is reported. detected beam propagates high-density electron γ rays similar spectral shape peak energy, thus closely resembling the structure an astrophysical leptonic jet. It envisaged that this experimental evidence, besides intrinsic relevance to laser-driven particle acceleration, may open pathway...
We have analyzed the coupling of ultraintense lasers (at ∼2×10{19} W/cm{2}) with solid foils limited transverse extent (∼10 s μm) by monitoring electrons and ions emitted from target. observe that reducing target surface area allows at to be reflected edges during or shortly after laser pulse. This refluxing can maintain a hotter, denser more homogeneous electron sheath around for longer time. Consequently, when takes places within acceleration time associated ions, we increased maximum...
A $\ensuremath{\gamma}$-ray source with an intense component around the giant dipole resonance for photonuclear absorption has been obtained via bremsstrahlung of electron bunches driven by a 10-TW tabletop laser. 3D particle-in-cell simulation proves achievement nonlinear regime leading to efficient acceleration several sequential per each laser pulse. The rate yield in region ($8<{E}_{\ensuremath{\gamma}}<17.5\text{ }\text{ }\mathrm{MeV}$) was measured, through radio activation gold...
The interaction of a 3x10;{19} W/cm;{2} laser pulse with metallic wire has been investigated using proton radiography. is observed to drive the propagation highly transient field along at speed light. Within temporal window 20 ps, current driven by this rises its peak magnitude approximately 10;{4} A before decaying below measurable levels. Supported particle-in-cell simulation results and simple theoretical reasoning, measured interpreted as charge-neutralizing disturbance propagated away...
The propagation of ion acoustic shocks in nonthermal plasmas is investigated, both analytically and numerically. An unmagnetized collisionless electron-ion plasma considered, featuring a superthermal (non-Maxwellian) electron distribution, which modeled by κ-(kappa) distribution function. Adopting multiscale approach, it shown that the dynamics low-amplitude hybrid Korteweg-de Vries–Burgers (KdVB) equation, nonlinear dispersion coefficients are functions κ parameter, while dissipative...
The dynamics of magnetic fields with an amplitude several tens megagauss, generated at both sides a solid target irradiated high-intensity (~10(19) W/cm(2)) picosecond laser pulse, has been spatially and temporally resolved using proton imaging technique. the is sufficiently large to have constraining effect on radial expansion plasma sheath surfaces. These results, supported by numerical simulations simple analytical modeling, may implications for ion acceleration driven rear side as well...
Significance High-resolution microcomputed tomography with benchtop X-ray sources requires long scan times because of the heat load limitation on anode. We present an alternative, high-brightness plasma-based source that does not suffer from this restriction. A demonstration a centimeter-scale complex organism achieves equivalent quality to commercial scanner. will soon be able record such scans in minutes, rather than hours required by conventional tubes.
We report on the temporally and spatially resolved detection of precursory stages that lead to formation an unmagnetized, supercritical collisionless shock in a laser-driven laboratory experiment. The measured evolution electrostatic potential associated with unveils transition from current free double layer into symmetric structure, stabilized by ion reflection at front. Supported matching particle-in-cell simulation theoretical considerations, we suggest this process is analogous shocks...
The development of current instabilities behind the front a cylindrically expanding plasma has been investigated experimentally via proton probing techniques. A multitude tubelike filamentary structures is observed to form created by irradiating solid-density wire targets with high-intensity (I ~ 10(19) W/cm(2)), picosecond-duration laser pulse. These filaments exhibit remarkable degree stability, persisting for several tens picoseconds, and appear be magnetized over filament length...
We report on the first experimental observation of a current-driven instability developing in quasineutral matter-antimatter beam. Strong magnetic fields (≥1 T) are measured, via means proton radiography technique, after propagation neutral electron-positron beam through background electron-ion plasma. The experimentally determined equipartition parameter ε_{B}≈10^{-3} is typical values inferred from models astrophysical gamma-ray bursts, which relativistic flows also expected to be pair...
This Letter of Intent describes LUXE (Laser Und XFEL Experiment), an experiment that aims to use the high-quality and high-energy electron beam European a powerful laser. The scientific objective is study quantum electrodynamics processes in regime strong fields. High-energy electrons, accelerated by linear accelerator, photons, produced via Bremsstrahlung those colliding with laser shall experience electric field up three times larger than Schwinger critical (the at which vacuum itself...
Experiments were performed on laser wakefield acceleration in the highly nonlinear regime. With powers P<250 TW and using an initial spot size larger than matched for guiding, we able to accelerate electrons energies E_{max}>2.5 GeV, fields exceeding 500 GV m^{-1}, with more 80 pC of charge at E>1 GeV. Three-dimensional particle-in-cell simulations show that oversized delays injection, avoiding beam loss as undergoes length oscillation. This enables injected remain regions highest...
We have designed a new filter pack array to measure angular variations in x-ray spectra during single shot. The was composed of repeating identical columns aluminum and copper filters varying thicknesses. These were located at different positions the spectrum each corresponding angle. This utilized an experiment energy evolution betatron x rays laser wakefield accelerator by curving with transverse density gradient, streaking across front charge-coupled device (CCD) camera. After subtracting...
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The expansion of electromagnetic postsolitons emerging from the interaction a 30 ps, $3\ifmmode\times\else\texttimes\fi{}{10}^{18}\text{ }\text{ }\mathrm{W}\text{ }{\mathrm{cm}}^{\ensuremath{-}2}$ laser pulse with an underdense deuterium plasma has been observed up to 100 ps after propagation, when large numbers were seen remain in plasma. temporal evolution accurately characterized high spatial and resolution. is compared analytical models three-dimensional particle-in-cell results,...