A5051894783- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Particle Accelerators and Free-Electron Lasers
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Laser-induced spectroscopy and plasma
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Laser-Matter Interactions and Applications
- Ion-surface interactions and analysis
- Superconducting Materials and Applications
- Pulsed Power Technology Applications
- Electromagnetic Simulation and Numerical Methods
- Advanced Data Storage Technologies
- High-pressure geophysics and materials
- Laser Design and Applications
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Distributed and Parallel Computing Systems
- Parallel Computing and Optimization Techniques
- Fusion materials and technologies
- Ionosphere and magnetosphere dynamics
- Particle physics theoretical and experimental studies
- Electromagnetic Scattering and Analysis
- Lightning and Electromagnetic Phenomena
Lawrence Berkeley National Laboratory
2016-2025
Deutsches Elektronen-Synchrotron DESY
2022
Lawrence Livermore National Security
2021
RadiaSoft (United States)
2020
Université Paris-Saclay
1997-2018
Université Paris-Sud
1996-2018
Centre National de la Recherche Scientifique
1996-2018
Lawrence Livermore National Laboratory
2004-2016
Fermi National Accelerator Laboratory
2016
Northern Illinois University
2016
Multi-GeV electron beams with energy up to 4.2 GeV, 6% rms spread, 6 pC charge, and 0.3 mrad divergence have been produced from a 9-cm-long capillary discharge waveguide plasma density of ≈7×1017 cm−3, powered by laser pulses peak power PW. Preformed waveguides allow the use lower compared unguided structures achieve same beam energy. A detailed comparison between experiment simulation indicates sensitivity in this regime guiding acceleration structure input intensity, density, near-field...
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...
This paper addresses the numerical issues related to modeling of beams or plasmas crossing at relativistic velocity using particle-in-cell method. Issues use standard Boris particle pusher are identified and a novel which circumvents them is proposed, whose effectiveness demonstrated on single tests. A procedure for solving fields retains electrostatic, magnetostatic, inductive field effects in direction mean species, fully explicit simpler than full Darwin approximation. Finally, results...
As noted in Wikipedia, skin the game refers to having ‘incurred risk by being involved achieving a goal’, where ‘ is synecdoche for person involved, and metaphor actions on field of play under discussion’. For exascale applications development US Department Energy Exascale Computing Project, nothing could be more apt, with delivering comprehensive science-based computational that effectively exploit high-performance computing technologies provide breakthrough modelling simulation data...
The Particle-In-Cell (PIC) Code-Framework Warp is being developed by the Heavy Ion Fusion Science Virtual National Laboratory (HIFS-VNL) to guide development of accelerators that can deliver beams suitable for high-energy density experiments and implosion inertial fusion capsules. It also applied in various areas outside program study design existing next-generation accelerators, including electron cloud effects laser wakefield acceleration example. This paper presents an overview Warp's...
A method is proposed to generate femtosecond, ultralow emittance (∼10-8 m rad), electron beams in a laser-plasma accelerator using two lasers of different colors. long-wavelength pump pulse, with large ponderomotive force and small peak electric field, excites wake without fully ionizing high-Z gas. short-wavelength injection copropagating delayed respect the laser, ionizes fraction remaining bound electrons at trapping phase, generating an beam that accelerated wake.
Turning the current experimental plasma accelerator state-of-the-art from a promising technology into mainstream scientific tools depends critically on high-performance, high-fidelity modeling of complex processes that develop over wide range space and time scales. As part U.S. Department Energy's Exascale Computing Project, team Lawrence Berkeley National Laboratory, in collaboration with teams SLAC Accelerator Laboratory Livermore is developing new simulation tool will harness power future...
The interaction of intense laser beams with plasmas created on solid targets involves a rich non-linear physics. Because such dense are reflective for light, the coupling incident beam occurs within thin layer at interface between plasma and vacuum. One main paradigms used to understand this coupling, known as Brunel mechanism, is expected be valid only very steep surfaces. Despite innumerable studies, its validity range remains uncertain, physics involved smoother plasma-vacuum interfaces...
(150 word max) We present a first-of-kind mesh-refined (MR) massively parallel Particle-In-Cell (PIC) code for kinetic plasma simulations optimized on the Frontier, Fugaku, Summit, and Perlmutter supercomputers. Major innovations, implemented in WarpX PIC code, include: (i) three level parallelization strategy that demonstrated performance portability scaling millions of A64FX cores tens thousands AMD Nvidia GPUs (ii) groundbreaking mesh refinement capability provides between 1.5 x to 4...
As the US Department of Energy (DOE) computing facilities began deploying petascale systems in 2008, DOE was already setting its sights on exascale. In that year, DARPA published a report feasibility reaching The authors identified several key challenges pursuit exascale including power, memory, concurrency, and resiliency. That informed DOE's strategy for With deployment Oak Ridge National Laboratory's Frontier supercomputer, we have officially entered era. this paper, discuss Frontier's...
We present an analysis which shows that the ranges of space and time scales spanned by a system are not invariant under Lorentz transformation. This implies existence frame reference minimizes aggregate measure range scales. Such is derived, for example, following cases: free electron laser, laser-plasma accelerator, particle beams interacting with clouds. The implications experimental, theoretical, numerical studies discussed. most immediate relevance reduction orders magnitude in computer...
Narrow bandwidth, high energy photon sources can be generated by Thomson scattering of laser light from energetic electrons, and detailed control the interaction is needed to produce quality sources.We present analytic calculations energy-angular spectra yield that parametrize influences electron beam parameters allow source design.These calculations, combined with numerical simulations, are applied evaluate using conventional in vacuum methods for improving via waveguides or plasma...
The Warp code (and its framework of associated tools) was initially developed for particle-in-cell simulations space-charge-dominated ion beams in accelerators, heavy-ion-driven inertial fusion energy, and related experiments. It has found a broad range applications, including nonneutral plasmas traps, stray electron clouds laser-based acceleration, the focusing produced when short-pulse lasers irradiate foil targets. We summarize novel methods used Warp, including: time-stepping conducive...
Magnetic Vortex Acceleration (MVA) from near critical density targets is one of the promising schemes laser-driven ion acceleration. 3D particle-in-cell simulations are used to explore a more extensive laser-target parameter space than previously reported on in literature as well study laser pulse coupling target, structure fields, and properties accelerated beam MVA scheme. The efficiency acceleration depends energy self-generated channel target. proton beams demonstrate high level...
WarpX is a general purpose electromagnetic particle-in-cell code that was originally designed to run on many-core CPU architectures. We describe the strategy, based AMReX library, followed allow use GPU-accelerated nodes OLCF’s Summit supercomputer, strategy we believe will extend upcoming machines Frontier and Aurora. summarize challenges encountered, lessons learned, give current performance results series of relevant benchmark problems.
The fully electromagnetic particle-in-cell code WarpX is being developed by a team of the U.S. DOE Exascale Computing Project (with additional non-U.S. collaborators on part code) to enable modeling chains tens hundreds plasma accelerator stages exascale supercomputers, for future collider designs. combining latest algorithmic advances (e.g., Lorentz boosted frame and pseudo-spectral Maxwell solvers) with mesh refinement runs computer processing unit graphical (GPU) architectures. In this...
We propose a scheme to explore regimes of strong-field Quantum Electrodynamics (SF-QED) otherwise unattainable with the currently available laser technology. The relies on relativistic plasma mirrors curved by radiation pressure boost intensity PetaWatt-class pulses Doppler effect and focus them extreme field intensities. show that very clear SF-QED signatures could be observed placing secondary target where boosted beam is focused.
Modeling plasma accelerators is a computationally challenging task and the quasi-static particle-in-cell algorithm method of choice in wide range situations. In this work, we present first performance-portable, quasi-static, three-dimensional code HiPACE++. By decomposing all computation 3D domain successive 2D transverse operations choosing appropriate memory management, HiPACE++ demonstrates orders-of-magnitude speedups on modern scientific GPUs over CPU-only implementations. The are...