Implementation of an non-iterative implicit electromagnetic field solver for dense plasma simulation

Welch, D. R.; Rose, D. V.; Clark, Robert E.; Genoni, T. C.; Hughes, T.P.

doi:10.1016/j.cpc.2004.06.028

Cited by 100 publications

(66 citation statements)

References 8 publications

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“…The experiment's femtosecond-scale interactions were modeled with 2D(3v) Cartesian Particle-in-Cell (PIC) simulations using the LSP code 30 with the simulation . The solid lines show the laser contrast from two different Pockels cell timings and using seven calibrated filter conditions.…”

Section: Simulationsmentioning

confidence: 99%

Backward-propagating MeV electrons from 1018 W/cm2 laser interactions with water

et al. 2015

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We present an experimental study of the generation of ∼MeV electrons opposite to the direction of laser propagation following the relativistic interaction at normal incidence of a ∼3 mJ, 10 18 W/cm 2 short pulse laser with a flowing 30 μm diameter water column target. Faraday cup measurements record hundreds of pC charge accelerated to energies exceeding 120 keV, and energy-resolved measurements of secondary x-ray emissions reveal an x-ray spectrum peaking above 800 keV, which is significantly higher energy than previous studies with similar experimental conditions and more than five times the ∼110 keV ponderomotive energy scale for the laser. We show that the energetic x-rays generated in the experiment result from backwardgoing, high-energy electrons interacting with the focusing optic and vacuum chamber walls with only a small component of x-ray emission emerging from the target itself. We also demonstrate that the high energy radiation can be suppressed through the attenuation of the nanosecond-scale pre-pulse. These results are supported by 2D Particle-in-Cell (PIC) simulations of the laser-plasma interaction that exhibit beam-like backward-propagating MeV electrons.

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Section: Simulationsmentioning

confidence: 99%

Backward-propagating MeV electrons from 1018 W/cm2 laser interactions with water

et al. 2015

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“…The direct implicit algorithm implemented in Lsp relaxes the the constraint on the time step ∆t to the extent that ω p,e and ω c,e do not need to be simultaneously resolved, although both cannot be under-resolved at the same time in the same place [105]. This allows us to model a plasma-like material response with greater numerical stability for longer time step intervals, reducing the overall cost of the simulation.…”

Section: Methodsmentioning

confidence: 99%

“…Due to its similar form to an electric susceptibility [105], S is called the implicit susceptibility tensor given by…”

Section: Direct Implicit Algorithmmentioning

confidence: 99%

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Specular Reflectivity and Hot-Electron Generation in High-Contrast Relativistic Laser-Plasma Interactions

Kemp

2013

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Ultra-intense laser (> 10 18 W/cm 2 ) interactions with matter are capable of producing relativistic electrons which have a variety of applications in state-of-the-art scientific and medical research conducted at universities and national laboratories across the world. Control of various aspects of these hot-electron distributions is highly desired to optimize a particular outcome. Hot-electron generation in low-contrast interactions, where significant amounts of under-dense pre-plasma are present, can be plagued by highly non-linear relativistic laser-plasma instabilities and quasi-static magnetic field generation, often resulting in less than desirable and predictable electron source characteristics. High-contrast interactions offer more controlled interactions but often at the cost of overall lower coupling and increased sensitivity to initial target conditions. An experiment studying the differences in hot-electron generation between high and low-contrast pulse interactions with solid density targets was performed on the Titan laser platform at the Jupiter Laser Facility at Lawrence Livermore National Laboratory in Livermore, CA. To date, these hot-electrons generated in the laboratory are not directly observable at the source of the interaction. Instead, indirect studies are performed using state-of-the-art simulations, constrained by the various experimental measurements. These measurements, more-often-than-not, rely on secondary processes generated by the transport of these electrons through the solid density materials which can susceptible to a variety instabilities and target material/geometry effects. Although often neglected in these types of studies, the specularly reflected light can provide invaluable insight as it is directly influenced by the interaction.In this thesis, I address the use of (personally obtained) experimental specular reflectivity measurements to indirectly study hot-electron generation in the context of high-contrast, ii relativistic laser-plasma interactions. Spatial, temporal and spectral properties of the incident and specular pulses, both near and far away from the interaction region where experimental measurements are obtained, are used to benchmark simulations designed to infer dominant hot-electron acceleration mechanisms and their corresponding energy/angular distributions. To handle this highly coupled interaction, I employed particle-in-cell modeling using a wide variety of algorithms (verified to be numerically stable and consistent with analytic expressions) and physical models (validated by experimental results) to reasonably model the interaction's sweeping range of plasma densities, temporal and spatial scales, G. E. Kemp, et al, Experimental and LSP modeling of pre-pulse effects on the laser-plasma interaction by a 527 nm laser pulse,

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“…A new "one pass" algorithm was developed and implemented in LSP for implicit solution of the electromagnetic field equations [55]. BEST was optimized for massively parallel computers and applied to collective effects of 3D bunched beams and the temperature-anisotropy instability.…”

Section: Other Applications and New Capabilitiesmentioning

confidence: 99%

Overview of theory and simulations in the Heavy Ion Fusion Science Virtual National Laboratory

Friedman

2007

Nuclear Instruments and Methods in Physics Research Section A:

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The Heavy Ion Fusion Science Virtual National Laboratory (HIFS-VNL) is a collaboration of Lawrence Berkeley National Laboratory, Lawrence Livermore National Laboratory, and Princeton Plasma Physics Laboratory. These laboratories, in cooperation with researchers at other institutions, are carrying out a coordinated effort to apply intense ion beams as drivers for studies of the physics of matter at extreme conditions, and ultimately for inertial fusion energy. Progress on this endeavor depends upon coordinated application of experiments, theory, and simulations. This paper describes the state of the art, with an emphasis on the coordination of modeling and experiment; developments in the simulation tools, and in the methods that underly them, are also treated.

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Implementation of an non-iterative implicit electromagnetic field solver for dense plasma simulation

Cited by 100 publications

References 8 publications

Backward-propagating MeV electrons from 1018 W/cm2 laser interactions with water

Backward-propagating MeV electrons from 1018 W/cm2 laser interactions with water

Specular Reflectivity and Hot-Electron Generation in High-Contrast Relativistic Laser-Plasma Interactions

Overview of theory and simulations in the Heavy Ion Fusion Science Virtual National Laboratory

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