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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:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Cornell Univ., Ithaca, NY (United States). Lab. of Plasma Studies
Publication Date:
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.
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. doi:10.1109/TPS.2018.2845341.
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. doi:10.1109/TPS.2018.2845341. https://www.osti.gov/servlets/purl/1499953.
@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 = {2018},
month = {6}
}

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