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Title: Plasma Jet Formation Disruption From a Critical Applied Uniform Axial Magnetic Field

Abstract

We examine the effects of varying the magnitude of an applied, uniform, axial magnetic field (Bz) on the formation of laboratory plasma jets produced by a 1-MA 100-ns rise time pulsed power generator in a radial foil configuration. A Helmholtz coil applies the external magnetic field (0 to 2 T). With a small-enough applied field, the foil surface ablation is relatively azimuthally uniform, and J×B forces drive the ablated plasma inward and upward to form a well-defined azimuthally symmetric jet. Using applied field strengths larger than a critical Bz = 1.1±0.1 T with aluminum foils, the plasma ablation is not azimuthally uniform, discrete bursts of plasma initiate from the foil surface, and the formation of a well-defined jet is disrupted. The critical Bz for this plasma jet formation disruption correlates with the foil material’s electrical resistivity and equation of state (EOS). To better understand the material-dependent phenomenon, we compare the experimental results with 3-D extended magnetohydrodynamics simulations of ablation of a 2 mm × 2 mm by 25-μm slab that represents a section of the radial foil. The simulations initialize the slab in the solid state and include the material resistivity and EOS from the solid to plasma phases. Asmore » is observed in the experimental disruption, these simulations show enhanced nonuniform plasma ablation with an applied Bz, which can inhibit the azimuthal uniformity necessary to produce a well-defined plasma jet. Furthermore, the simulations also show a material and resistivity dependence on the ablation process similar to the trend shown by the experiments. These results demonstrate the necessity of accurate, detailed modeling of material properties during the transition from solid to plasma phases.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Cornell Univ., Ithaca, NY (United States)
Publication Date:
Research Org.:
USDOE
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1526205
Grant/Contract Number:  
NA0003764
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Plasma Science
Additional Journal Information:
Journal Volume: 47; Journal Issue: 7; Journal ID: ISSN 0093-3813
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Byvank, Tom, Hamlin, Nathaniel, Atoyan, Levon, Seyler, Charles E., and Kusse, Bruce R. Plasma Jet Formation Disruption From a Critical Applied Uniform Axial Magnetic Field. United States: N. p., 2019. Web. doi:10.1109/TPS.2019.2920147.
Byvank, Tom, Hamlin, Nathaniel, Atoyan, Levon, Seyler, Charles E., & Kusse, Bruce R. Plasma Jet Formation Disruption From a Critical Applied Uniform Axial Magnetic Field. United States. doi:10.1109/TPS.2019.2920147.
Byvank, Tom, Hamlin, Nathaniel, Atoyan, Levon, Seyler, Charles E., and Kusse, Bruce R. Thu . "Plasma Jet Formation Disruption From a Critical Applied Uniform Axial Magnetic Field". United States. doi:10.1109/TPS.2019.2920147. https://www.osti.gov/servlets/purl/1526205.
@article{osti_1526205,
title = {Plasma Jet Formation Disruption From a Critical Applied Uniform Axial Magnetic Field},
author = {Byvank, Tom and Hamlin, Nathaniel and Atoyan, Levon and Seyler, Charles E. and Kusse, Bruce R.},
abstractNote = {We examine the effects of varying the magnitude of an applied, uniform, axial magnetic field (Bz) on the formation of laboratory plasma jets produced by a 1-MA 100-ns rise time pulsed power generator in a radial foil configuration. A Helmholtz coil applies the external magnetic field (0 to 2 T). With a small-enough applied field, the foil surface ablation is relatively azimuthally uniform, and J×B forces drive the ablated plasma inward and upward to form a well-defined azimuthally symmetric jet. Using applied field strengths larger than a critical Bz = 1.1±0.1 T with aluminum foils, the plasma ablation is not azimuthally uniform, discrete bursts of plasma initiate from the foil surface, and the formation of a well-defined jet is disrupted. The critical Bz for this plasma jet formation disruption correlates with the foil material’s electrical resistivity and equation of state (EOS). To better understand the material-dependent phenomenon, we compare the experimental results with 3-D extended magnetohydrodynamics simulations of ablation of a 2 mm × 2 mm by 25-μm slab that represents a section of the radial foil. The simulations initialize the slab in the solid state and include the material resistivity and EOS from the solid to plasma phases. As is observed in the experimental disruption, these simulations show enhanced nonuniform plasma ablation with an applied Bz, which can inhibit the azimuthal uniformity necessary to produce a well-defined plasma jet. Furthermore, the simulations also show a material and resistivity dependence on the ablation process similar to the trend shown by the experiments. These results demonstrate the necessity of accurate, detailed modeling of material properties during the transition from solid to plasma phases.},
doi = {10.1109/TPS.2019.2920147},
journal = {IEEE Transactions on Plasma Science},
number = 7,
volume = 47,
place = {United States},
year = {2019},
month = {6}
}

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