A5027937765- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Astrophysics and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- High-pressure geophysics and materials
- Particle accelerators and beam dynamics
- Quantum, superfluid, helium dynamics
- Astrophysics and Star Formation Studies
- Nuclear Physics and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Dust and Plasma Wave Phenomena
- Atomic and Molecular Physics
- Particle Detector Development and Performance
- Ion-surface interactions and analysis
- Advanced NMR Techniques and Applications
- Plasma Diagnostics and Applications
- Optical properties and cooling technologies in crystalline materials
- Magnetic confinement fusion research
- Particle Accelerators and Free-Electron Lasers
- Laser-Matter Interactions and Applications
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Physics of Superconductivity and Magnetism
- International Relations in Latin America
University of Lisbon
2022-2025
Laboratoire de Physique des Plasmas
2024
Lancaster University
2020-2021
Abstract Relativistic electron-positron plasmas are ubiquitous in extreme astrophysical environments such as black-hole and neutron-star magnetospheres, where accretion-powered jets pulsar winds expected to be enriched with pairs. Their role the dynamics of is many cases believed fundamental, but their behavior differs significantly from typical electron-ion due matter-antimatter symmetry charged components. So far, our experimental inability produce large yields positrons quasi-neutral...
Under the presence of strong electromagnetic fields and radiation reaction, plasmas develop anisotropic momentum distributions, characterized by a population inversion. This is general property collisionless when reaction force taken into account. We study case plasma in magnetic field demonstrate development ring distributions. The timescales for formation are derived this configuration. analytical results properties confirmed with particle-in-cell simulations. resulting distributions...
Relativistic plasmas in strong electromagnetic fields exhibit distinct properties compared to classical plasmas. In astrophysical environments, such as neutron stars, white dwarfs, active galactic nuclei, and shocks, relativistic are pervasive expected play a crucial role the dynamics of these systems. Despite their significance, experimental theoretical studies have been limited. Here, we present first ab initio high-resolution kinetic simulations undergoing synchrotron cooling highly...
Generic equilibria are derived for turbulent relaxing plasmas via an entropy-maximization procedure that accounts the short-time conservation of certain collisionless invariants. The these invariants endows system with a partial “memory” its prior conditions but is imperfect on long time scales due to development cascade small scales, which breaks precise phase volume, making this memory imprecise. still determined by invariants, themselves driven universal form nature turbulence. This...
We study how radiation reaction leads plasmas initially in kinetic equilibrium to develop features momentum space, such as anisotropies and population inversion, resulting a ring-shaped distribution that can drive instabilities. employ the Landau–Lifshiftz model for plasma strong magnetic field, we obtain necessary condition development of inversion; show isotropic Maxwellian Maxwell–Jüttner plasmas, with thermal temperature T>mec2/3, will ring-like distribution. The timescales...
Abstract The interaction of ultraintense laser pulses with solids is largely affected by the plasma gradient at vacuum–solid interface, which modifies absorption and ultimately, controls energy distribution function heated electrons. A micrometer scale-length has been predicted to yield a significant enhancement weight fast electron population play major role in laser-driven proton acceleration thin foils. We report on recent experimental results from foil targets ultra-relativistic...
<title>Abstract</title> Relativistic electron-positron (e<sup>±</sup>)plasmas are ubiquitous in extreme astrophysical environments such as black holes and neutron star magnetospheres, where accretion-powered jets pulsar winds expected to be enriched with pair plasmas. Their behaviour is quite different from typical electron-ion plasmas due the matter-antimatter symmetry of charged components their role dynamics compact objects believed fundamental. So far, our experimental inability produce...
In this paper we propose a methodology for the efficient implementation of machine learning (ML)-based methods in particle-in-cell (PIC) codes, with focus on Monte Carlo or statistical extensions to PIC algorithm. The presented approach allows neural networks be developed Python environment, where advanced ML tools are readily available proficiently train and test them. Those models then efficiently deployed within highly scalable fully parallelized simulations during runtime. We demonstrate...
We study how radiation reaction leads plasmas initially in kinetic equilibrium to develop features momentum space, such as anisotropies and population inversion, resulting a ring-shaped distribution that can drive instabilities. employ the Landau-Lifshiftz model for plasma strong magnetic field, we obtain necessary condition development of show isotropic Maxwellian Maxwell-J\"uttner plasmas, with thermal temperature $T>m_e c^2/\sqrt{3}$, will ring-like distribution. The timescales forming...
Generic equilibria are derived for turbulent relaxing plasmas via an entropy-maximization procedure that accounts the short-time conservation of certain collisionless invariants. The these invariants endows system with a partial `memory' its prior conditions, but is imperfect on long time scales due to development cascade small scales, which breaks precise phase volume, making this memory imprecise. still determined by invariants, themselves driven universal form nature turbulence. This...
Relativistic plasmas in strong electromagnetic fields exhibit distinct properties compared to classical plasmas. In astrophysical environments, such as neutron stars, white dwarfs, AGNs, and shocks, relativistic are pervasive expected play a crucial role the dynamics of these systems. Despite their significance, both experimental theoretical studies have been limited. Here, we present first ab initio high-resolution kinetic simulations undergoing synchrotron cooling highly magnetized medium....
We show that circularly polarized lasers create plasmas with long-lasting ring-shaped weakly relativistic momentum distributions which, in the presence of an ambient magnetic field, are prone to electron cyclotron maser instability. Theoretical results and particle-in-cell simulations current laser technology can effectively induce field ionized tailored distribution functions probe controlled conditions, providing direct experimental evidence coherent radiation processes driven by or Landau...
<title>Abstract</title> The material properties of asteroid samples exhibit a dynamic response under high-energy irradiation, which no experiments have yet been able to cover. However, studying the is relevant in several fields. For instance, proposed deflection techniques, all require behavior object be known very precisely model orbits accurately and predict transfer kinetic energy. In our experimental campaign at CERN's HiRadMat facility, we have, for first time, irradiated an...
Relativistic electron-positron plasmas are ubiquitous in extreme astrophysical environments such as black holes and neutron star magnetospheres, where accretion-powered jets pulsar winds expected to be enriched with pair plasmas. Their behaviour is quite different from typical electron-ion due the matter-antimatter symmetry of charged components their role dynamics compact objects believed fundamental. So far, our experimental inability produce large yields positrons quasi-neutral beams has...
Abstract We report on recent experimental results proton acceleration from laser interaction with foil targets at ultra-relativistic intensities. show a three-fold increase in the cut-off energy when micrometer scale-length pre-plasma is introduced by irradiation low femtosecond pre-pulse. The target sufficiently thick to prevent disruption of sheath field rear surface shock launched Measurements are compared accurate, numerical hydrodynamic and Particle-In-Cell simulations where role finite...
In this paper we propose a methodology for the efficient implementation of Machine Learning (ML)-based methods in particle-in-cell (PIC) codes, with focus on Monte-Carlo or statistical extensions to PIC algorithm. The presented approach allows neural networks be developed Python environment, where advanced ML tools are readily available proficiently train and test them. Those models then efficiently deployed within highly-scalable fully parallelized simulations during runtime. We demonstrate...
Under the presence of strong electromagnetic fields and radiation reaction, plasmas develop anisotropic momentum distributions, characterized by a population inversion. This is general property collisionless when reaction force taken into account. We study case plasma in magnetic field demonstrate development ring distributions. The timescales for formation are derived this configuration. analytical results properties confirmed with particle-in-cell simulations. resulting distributions...
Abstract The interaction of ultraintense laser pulses with solids is largely affected by the plasma gradient at vacuum-solid interface, which modifies absorption and ultimately, controls energy distribution function heated electrons. A micrometer scale-length has been predicted to yield a significant enhancement weight fast electron population play major role in laser-driven proton acceleration thin foils. We report on recent experimental results from foil targets ultra-relativistic...