External Magnetic Field Effects on Ablation of Current-Driven Foils Using an Extended Magnetohydrodynamics Simulation

Byvank, Tom; Hamlin, Nathaniel; Atoyan, Levon; Seyler, Charles E.; Kusse, Bruce R.

doi:10.1109/TPS.2018.2845341

Title: External Magnetic Field Effects on Ablation of Current-Driven Foils Using an Extended Magnetohydrodynamics Simulation

Abstract

We numerically model the ablation process of a 25-μm-thick aluminum foil driven by a pulsed-power machine that provides a 1-MA peak current in a 100-ns zero-to-peak rise time. The extended magnetohydrodynamics simulation is a discontinuous Galerkin code with Cartesian coordinates in 3-D and with 25-μm spatial resolution. We investigate here the influence of an external magnetic field normal to the foil surface, B _z . During the foil ablation, B _z = 1 T causes more nonuniform distributions of density and current compared to B _z = 0 T. B _z = 4 T delays the generation of surface plasma relative to the 0- and 1-T cases. The understanding of a material's ablation as it undergoes transition from the solid to plasma phases requires detailed knowledge of a material's equation of state and conductivity. This paper of warm dense matter and how instabilities propagate from a solid material to plasma motivates improvements to both numerical simulations and experimental diagnostics.

Authors:

^[1]; Hamlin, Nathaniel ^[1];

^[1]; Seyler, Charles E. ^[1];

^[1]

Cornell Univ., Ithaca, NY (United States). Lab. of Plasma Studies

Publication Date:: Fri Jun 22 00:00:00 EDT 2018

Research Org.:: Cornell Univ., Ithaca, NY (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

OSTI Identifier:: 1499953

Grant/Contract Number:: NA0003764; NA0001836; PHY-1102471

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Plasma Science

Additional Journal Information:: Journal Volume: 46; Journal Issue: 11; Journal ID: ISSN 0093-3813

Publisher:: IEEE

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ablation; aluminum; magnetic field effects; magnetohydrodynamics (MHD); pulse power systems

Citation Formats


                    Byvank, Tom, Hamlin, Nathaniel, Atoyan, Levon, Seyler, Charles E., and Kusse, Bruce R. External Magnetic Field Effects on Ablation of Current-Driven Foils Using an Extended Magnetohydrodynamics Simulation.  United States: N. p., 2018. 
Web.  doi:10.1109/TPS.2018.2845341.

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                    Byvank, Tom, Hamlin, Nathaniel, Atoyan, Levon, Seyler, Charles E., & Kusse, Bruce R. External Magnetic Field Effects on Ablation of Current-Driven Foils Using an Extended Magnetohydrodynamics Simulation.  United States.  https://doi.org/10.1109/TPS.2018.2845341

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                    Byvank, Tom, Hamlin, Nathaniel, Atoyan, Levon, Seyler, Charles E., and Kusse, Bruce R. Fri .  
"External Magnetic Field Effects on Ablation of Current-Driven Foils Using an Extended Magnetohydrodynamics Simulation".  United States.  https://doi.org/10.1109/TPS.2018.2845341.  https://www.osti.gov/servlets/purl/1499953.

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@article{osti_1499953,

  title        = {External Magnetic Field Effects on Ablation of Current-Driven Foils Using an Extended Magnetohydrodynamics Simulation},

  author       = {Byvank, Tom and Hamlin, Nathaniel and Atoyan, Levon and Seyler, Charles E. and Kusse, Bruce R.},

  abstractNote = {We numerically model the ablation process of a 25-μm-thick aluminum foil driven by a pulsed-power machine that provides a 1-MA peak current in a 100-ns zero-to-peak rise time. The extended magnetohydrodynamics simulation is a discontinuous Galerkin code with Cartesian coordinates in 3-D and with 25-μm spatial resolution. We investigate here the influence of an external magnetic field normal to the foil surface, B z . During the foil ablation, B z = 1 T causes more nonuniform distributions of density and current compared to B z = 0 T. B z = 4 T delays the generation of surface plasma relative to the 0- and 1-T cases. The understanding of a material's ablation as it undergoes transition from the solid to plasma phases requires detailed knowledge of a material's equation of state and conductivity. This paper of warm dense matter and how instabilities propagate from a solid material to plasma motivates improvements to both numerical simulations and experimental diagnostics.},

  doi          = {10.1109/TPS.2018.2845341},

  journal      = {IEEE Transactions on Plasma Science},

  number       = 11,

  volume       = 46,

  place        = {United States},

  year         = {Fri Jun 22 00:00:00 EDT 2018},

  month        = {Fri Jun 22 00:00:00 EDT 2018}

}

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https://doi.org/10.1109/TPS.2018.2845341

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Figures / Tables:

Fig. 1.: Computational domain (rectangular prism) at 45 ns into current pulse. Foil density has expanded slightly compared to 0 ns. Red dashed lines: position of the foil edges that are not visible. Red arrow: current through foil in the x-direction. Yellow arrow: driving magnetic field in the y-direction appliedmore »

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