Bow shocks formed by plasma collisions in laser irradiated semi-cylindrical cavities

Filevich, Jorge; Purvis, Michael; Grava, Jonathan; Ryan, Duncan P.; Dunn, James P.; Moon, Stephen J.; Shlyaptsev, Vyacheslav N.; Rocca, J. J.

doi:10.1016/j.hedp.2009.04.003

Cited by 5 publications

(6 citation statements)

References 17 publications

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“…In this work we validated the FLASH code for a specific, previously-published experiment on laser-irradiated Al plasmas. Similarly high-quality interferometric data also exists for C, Cu and Mo [31,32], which can be used in future efforts to validate the HEDP capabilities in FLASH.…”

Section: Conclusion and Summarymentioning

confidence: 97%

“…They were also motivated by the fact that similar, earlier NOVA experiments produced puzzling results, raising the question whether radiation-hydrodynamics codes might be inadequate to model the experiment and collisionless Particle-In-Cell (PIC) codes might be needed instead(WAN). GRAVA and later work by the same collaboration [31,32] showed that radiation-hydrodynamic codes are able to model this kind of experiment, and for a variety of different target elements.…”

Section: Comparison To Grava Et Al 2008mentioning

confidence: 98%

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Code-to-Code Comparison and Validation of the Radiation-Hydrodynamics Capabilities of the FLASH Code Using a Laboratory Astrophysical Jet

Orban¹,

Fatenejad²,

Lamb³

2020

Preprint

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The potential for laser-produced plasmas to yield fundamental insights into high energy density physics (HEDP) and deliver other useful applications can sometimes be frustrated by uncertainties in modeling the properties and behavior of these plasmas using radiation-hydrodynamics codes. In an effort to overcome this and to corroborate the accuracy of the HEDP capabilities that have been added to the publicly available FLASH radiation-hydrodynamics code, we present detailed code-to-code comparisons between FLASH and the HYDRA code developed at Lawrence Livermore National Laboratory using previously published HYDRA simulations from Grava et al. 2008. That study describes a laser experiment that produced a jet-like feature that the authors compare to astrophysical jets. Importantly, the Grava et al. 2008 experiment included detailed x-ray interferometric measurements of electron number densities. Despite radically different methods for treating the computational mesh, and different equation of state and opacity models, the FLASH results greatly resemble the results from HYDRA and, most importantly, the experimental measurements of electron density. Having validated the FLASH code in this way, we use the code to further investigate and understand the formation of the jet seen in the Grava et al. (2008) experiment and discuss its relation to the Wan et al. (1997) experiment at the NOVA laser.

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Section: Conclusion and Summarymentioning

confidence: 97%

Section: Comparison To Grava Et Al 2008mentioning

confidence: 98%

Code-to-Code Comparison and Validation of the Radiation-Hydrodynamics Capabilities of the FLASH Code Using a Laboratory Astrophysical Jet

Orban¹,

Fatenejad²,

Lamb³

2020

Preprint

View full text Add to dashboard Cite

show abstract

“…It was also significant that earlier NOVA experiments along these lines led to some puzzling results, raising the question whether collisionless Particle-In-Cell (PIC) codes might actually be more appropriate to the experimental regime than rad-hydro codes [24]. Grava et al and later work by that collaboration [52,53] showed that rad-hydro codes can indeed be trusted for these experiments, and for a variety of different elements.…”

Section: Code-to-code Comparisons and Validation For An Aluminum Slab...mentioning

confidence: 99%

“…Restricting our investigation to Aluminum greatly simplifies the task of doing code-to-code comparisons and validating the HEDP extensions of FLASH. We hope to investigate other validation experiments with other target materials in the near future [52,53].…”

Section: Code-to-code Comparisons and Validation For An Aluminum Slab...mentioning

confidence: 99%

A Radiation-Hydrodynamics Code Comparison for Laser-Produced Plasmas: FLASH versus HYDRA and the Results of Validation Experiments

Orban,

Fatenejad,

Chawla

et al. 2013

Preprint

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The potential for laser-produced plasmas to yield fundamental insights into high energy density physics (HEDP) and deliver other useful applications can sometimes be frustrated by uncertainties in modeling the properties and expansion of these plasmas using radiation-hydrodynamics codes. In an effort to overcome this and to corroborate the accuracy of the HEDP capabilities recently added to the publicly available FLASH radiation-hydrodynamics code, we present detailed comparisons of FLASH results to new and previously published results from the HYDRA code used extensively at Lawrence Livermore National Laboratory. We focus on two very different problems of interest: (1) an Aluminum slab irradiated by 15.3 and 76.7 mJ of "pre-pulse" laser energy and (2) a mm-long triangular groove cut in an Aluminum target irradiated by a rectangular laser beam. Because this latter problem bears a resemblance to astrophysical jets, Grava et al., Phys. Rev. E, 78, (2008) performed this experiment and compared detailed x-ray interferometric measurements of electron number densities to HYDRA simulations. Thus, the former problem provides an opportunity for code-to-code comparison, while the latter provides an opportunity for both code-to-code comparison and validation. Despite radically different schemes for determining the computational mesh, and different equation of state and opacity models, the HYDRA and FLASH codes yield results that are in excellent agreement for both problems and with the experimental data for the latter. Having validated the FLASH code in this way, we use the code to further investigate the formation of the jet seen in the Grava et al. (2008) experiment and discuss its relation to the Wan et al. (1997) experiment at the NOVA laser.

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“…Experiments of this kind would also be interesting as a new type of code validation experiment for high intensity laser-plasma interactions. Both during and after the laser interaction, ions move and the electron and ion density profiles change over time which can be investigated with interferometry [16][17][18] and measurements of escaping ion energies (e.g. Ref.…”

Section: Introductionmentioning

confidence: 99%

Particle-in-cell simulations of density peak formation and ion heating from short pulse laser-driven ponderomotive steepening

et al. 2019

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We use particle-in-cell (PIC) simulations and simple analytic models to investigate the laser-plasma interaction known as ponderomotive steepening. When normally incident laser light reflects at the critical surface of a plasma, the resulting standing electromagnetic wave modifies the electron density profile via the ponderomotive force, which creates peaks in the electron density separated by approximately half of the laser wavelength. What is less well studied is how this charge imbalance accelerates ions towards the electron density peaks, modifying the ion density profile of the plasma. Idealized PIC simulations with an extended underdense plasma shelf are used to isolate the dynamics of ion density peak growth for a 42 fs pulse from an 800 nm laser with an intensity of 10 18 W cm −2 . These simulations exhibit sustained longitudinal electric fields of 200 GV m −1 , which produce counter-steaming populations of ions reaching a few keV in energy. We compare these simulations to theoretical models, and we explore how ion energy depends on factors such as the plasma density and the laser wavelength, pulse duration, and intensity. We also provide relations for the strength of longitudinal electric fields and an approximate timescale for the density peaks to develop. These conclusions may be useful investigating the phenomenon of ponderomotive steepening as advances in laser technology allow shorter and more intense pulses to be produced at various wavelengths. We also discuss the parallels with other work studying the interference from two counter-propagating laser pulses.

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Bow shocks formed by plasma collisions in laser irradiated semi-cylindrical cavities

Cited by 5 publications

References 17 publications

Code-to-Code Comparison and Validation of the Radiation-Hydrodynamics Capabilities of the FLASH Code Using a Laboratory Astrophysical Jet

Code-to-Code Comparison and Validation of the Radiation-Hydrodynamics Capabilities of the FLASH Code Using a Laboratory Astrophysical Jet

A Radiation-Hydrodynamics Code Comparison for Laser-Produced Plasmas: FLASH versus HYDRA and the Results of Validation Experiments

Particle-in-cell simulations of density peak formation and ion heating from short pulse laser-driven ponderomotive steepening

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