A5019519469- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Atomic and Molecular Physics
- High-pressure geophysics and materials
- Laser Design and Applications
- Particle Accelerators and Free-Electron Lasers
- Magnetic confinement fusion research
- Laser Material Processing Techniques
- Planetary Science and Exploration
- Electron and X-Ray Spectroscopy Techniques
- Particle accelerators and beam dynamics
- Orbital Angular Momentum in Optics
- Photocathodes and Microchannel Plates
- Particle Detector Development and Performance
- Iron Metabolism and Disorders
- X-ray Spectroscopy and Fluorescence Analysis
- Trace Elements in Health
- Plasma Diagnostics and Applications
- Advanced X-ray Imaging Techniques
- Nuclear Physics and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Crystallography and Radiation Phenomena
- Monoclonal and Polyclonal Antibodies Research
- Pulsed Power Technology Applications
University of Lisbon
2015-2025
Instituto Superior Técnico
2015-2025
University of Belgrade
2024
Heidelberg Pharma (Germany)
2023-2024
Instituto Politécnico de Lisboa
2016-2023
Princeton University
2019
Humboldt-Universität zu Berlin
2018
University of Potsdam
2018
Federal Institute For Materials Research and Testing
2018
Czech Academy of Sciences, Institute of Physics
2017
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...
The direct laser acceleration (DLA) of electrons in underdense plasmas can provide hundreds nC accelerated to near-GeV energies using currently available lasers. Here we demonstrate the key role electron transverse displacement and use it analytically predict expected maximum energies. energy scaling is shown be agreement with full-scale quasi-3D particle-in-cell simulations a pulse propagating through preformed guiding channel directly used for optimizing DLA near-future facilities....
A model for laser light absorption in electron-positron plasmas self-consistently created via QED cascades is described. The energy mainly absorbed due to hard photon emission nonlinear Compton scattering. degree of depends on the intensity and pulse duration. are studied with multi-dimensional particle-in-cell simulations complemented by a module macro-particle merging algorithm that allows handle exponential growth number particles. Results range from moderate-intensity regimes ($\sim$ 10...
ELI-Beamlines (ELI-BL), one of the three pillars Extreme Light Infrastructure endeavour, will be in a unique position to perform research high-energy-density-physics (HEDP), plasma physics and ultra-high intensity (UHI) (1022W/cm2) laser–plasma interaction. Recently need for HED laboratory was identified P3 (plasma platform) installation under construction ELI-BL an answer. The 10 PW laser makes possible fundamental topics from high-field new extreme states matter such as radiation-dominated...
The growth rates of seeded QED cascades in counter propagating lasers are calculated with first principles 2D/3D QED-PIC simulations. dependence the rate on laser polarization and intensity compared analytical models that support findings provide an insight regarding qualitative trend cascade when field is varied. A discussion about cascade's threshold included, based numerical results. These results show relativistic pair plasmas efficient conversion from photons to gamma rays can be...
In this paper, we investigate the evolution of energy spread and divergence electron beams while they interact with different laser pulses at intensities where quantum effects radiation reaction are relevance. The interaction is modelled a electrodynamic (QED)-PIC code results compared those obtained using standard PIC classical module. addition, an analytical model presented that estimates value final after has finished. While continuous process, in QED, emission stochastic. two pictures...
Using full-scale 3D particle-in-cell simulations we show that the radiation reaction dominated regime can be reached in an all optical configuration through collision of a $\sim$1 GeV laser wakefield accelerated (LWFA) electron bunch with counter propagating pulse. In this significantly reduces energy particle bunch, thus providing clear experimental signatures for process currently available lasers. We also transition between classical and quantum could investigated same intensities...
Abstract The new generation of laser facilities is expected to deliver short (10 fs–100 fs) pulses with 10–100 PW peak power. This opens an opportunity study matter at extreme intensities in the laboratory and provides access physics. Here we propose scatter GeV-class electron beams from laser-plasma accelerators a multi-PW normal incidence. In this configuration, one can both create accelerate electron-positron pairs. particles are generated focus gain relativistic momentum direction...
A laser beam's peak intensity may be programmed to move at an arbitrary velocity by adjusting the focal time and location of its frequencies, temporal slices, or annuli. Such ``flying focus'' beams show promise in enabling new laser-matter applications. To assess these possibilities, authors analytically describe electromagnetic fields flying-focus pulses with polarization orbital angular momentum.
Relativistic positron beams are required for fundamental research in nonlinear strong field QED, plasma physics, and laboratory astrophysics. Positrons difficult to create manipulate due their short lifetime, energy gain is limited by the accelerator size conventional facilities. Alternative compact concepts plasmas becoming more mature electrons, but generation acceleration remain an outstanding challenge. Here we propose a new setup where can generate, inject accelerate them single stage...
We present an analytical and numerical study of multiple-laser QED cascades induced with linearly polarised laser pulses. analyse different polarisation orientations propose a configuration that maximises the cascade multiplicity favours absorption. generalise estimate for growth rate previously calculated in field two colliding pulses account multiple interaction. The is verified by comprehensive four-laser across range intensities PIC module OSIRIS. show using four 30 fs pulses, one can...
Abstract The intensities of the order 10 23–24 W/cm 2 are required to efficiently generate electron-positron pairs in laser-matter interaction when multiple laser beam collision is employed. To achieve such intense fields with upcoming generation PW beams, focusing sub-micron spot size required. In this paper, possibility pair production cascade development studied for case a standing wave created by two tightly focused colliding pulses. Even though stronger ponderomotive force expels seed...
The interaction of ultrashort, high intensity laser pulses with thin foil targets leads to ion acceleration on the target rear surface. To make this source useful for applications, it is important optimize transfer energy from into accelerated ions. One most promising ways achieve consists in engineering front by introducing periodic nanostructures. In paper, effect these structures studied analytically and multi-dimensional particle-in-cell simulations. We assessed role structure shape,...
Direct Laser Acceleration (DLA) of electrons during a high-energy, picosecond laser interaction with an underdense plasma has been demonstrated to be substantially enhanced by controlling the focusing geometry. Experiments using OMEGA EP facility measured accelerated maximum energies exceeding 120 times ponderomotive energy under certain focusing, pulse energy, and density conditions. Two-dimensional particle-in-cell simulations show that conditions alter field evolution, channel fields...
Abstract We have investigated proton acceleration in the forward direction from a near-critical density hydrogen gas jet target irradiated by high intensity (10 18 W/cm 2 ), short-pulse (5 ps) laser with wavelength of 1.054 μm. observed signature Collisionless Shock Acceleration mechanism, namely quasi-monoenergetic beams small divergence addition to more commonly electron-sheath driven acceleration. The energies we obtained were modest (~MeV), but prospects for improvement are offered...
Numerical modeling of electromagnetic waves is an important tool for understanding the interaction light and matter, lies at core computational electromagnetics. Traditional approaches to injecting evolving waves, however, can be prohibitively expensive complex emerging problems interest restrict comparisons that made between simulation theory. As alternative, we demonstrate incorporated analytically by decomposing physics equations into analytic parts. In particle-in-cell laser–plasma...
Relativistic laser pulses can accelerate electrons up to energies of several GeV during the interaction with gaseous targets through direct acceleration (DLA) mechanism. While are accelerated high energies, they oscillate transversely propagation direction, emitting radiation. We demonstrate using particle-in-cell (PIC) simulations that electron charge enables DLA sources emit $\sim 10^{10}~\rm{photons}/0.1\%\rm{BW}$ at hundreds MeV when interacting multi-petawatt pulses. provide an...
Positron creation and acceleration is one of the major challenges for constructing future lepton colliders. On hand, conventional technology can provide a solution, but at prohibitive cost scale. other alternative, reduced-scale ideas positron beam generation could bring this dream closer to reality. Here we propose plasma-based method using powerful laser propagating through dense narrow plasma channel. A large amount electrons are injected within channel during propagation. This electron...
Magnetic field generation in ultraintense laser-solid interactions is studied over a range of laser intensities relevant to next-generation facilities <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mo>(</a:mo><a:msub><a:mi>a</a:mi><a:mn>0</a:mn></a:msub><a:mo>=</a:mo><a:mn>50</a:mn><a:mo>–</a:mo><a:mn>500</a:mn><a:mo>)</a:mo></a:mrow></a:math> using two-dimensional (2D) particle-in-cell simulations including strong-field quantum electrodynamic effects. It found that fields...
Abstract The next generation of Petawatt-class lasers presents the opportunity to study positron production and acceleration experimentally, in an all-optical setting. Several configurations were proposed produce accelerate positrons a single laser stage. However, these have yielded limited beam quality low particle count. This paper methods for improving injection retention obtained via Bethe-Heitler pair accelerated using direct (DLA) plasma channel. work first introduces semi-analytical...
Laser pulses of extreme intensities () are about to become available in the laboratory. The prepulse such a laser can induce plasma expansion that generates low-density channel near-critical gas jets. We present study formation and subsequent direct acceleration electrons within pre-formed channel. Radiation reaction affects several ways. It first interferes with motion return current on walls. In addition, it reduces radial expelling efficiency transverse ponderomotive force, leading...
Abstract The new generation of multi-PetaWatt laser facilities will allow tests strong field quantum electrodynamics (QED), as well provide an opportunity for novel photon and lepton sources. first experiments are planned to study the (nearly) head-on scattering intense, focused pulses with either relativistic electron beams or high-energy In this work, we present a numerical framework that can fast predictions asymptotic particle distributions after scattering. method detailed in manuscript...