Abstract

Three-dimensional magnetohydrodynamic (MHD) simulations are able to model the generation of disc-shaped plasma, driven by laser ablation from a current carrying rod in a pulsed-power machine producing azimuthal magnetic fields of 2–3 MG. The plasma at such extreme conditions is unique in that the parameter space for the plasma β and Hall parameter χ transition from below unity to greater than unity at different stages of the plasma generation. In simulations, the formation of the plasma disc in the azimuthal direction, is driven by heat flux from the laser spot and depends on the set of transport coefficients used in simulations. The most recent set of transport coefficients leads to the formation of plasma ejecta at the back end of the rod, that qualitatively matches experiments. Specifically, the cross-gradient Nernst effect, which twists magnetic field, is shown to have a large effect on the shape of the back end ejecta. In the direction along the axis of the rod there is propagation of perturbations from the disc as observed in experiments. In simulations the period of temperature perturbations is in good agreement with experimental results. Furthermore, an instability due to coupling of heat flux and the magnetic field advection providesmore » a possible explanation for perturbation growth along the axis of the rod, and the instability growth rate is consistent with experimental results.« less

Authors:

Leal, Luis ^[1]; Maximov, Andrei  ^[2];

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• Search DOE PAGES for ORCID "0000-0002-5742-3034"

García-Rubio, Fernando  ^[2];

• Search DOE PAGES for author "García-Rubio, Fernando"
• Search DOE PAGES for ORCID "0000-0002-7168-3190"

Betti, Riccardo  ^[2];

• Search DOE PAGES for author "Betti, Riccardo"
• Search DOE PAGES for ORCID "0000-0001-8742-0304"

Ivanov, Vladimir ^[3]

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+ Show Author Affiliations

1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
2. University of Rochester, NY (United States)
3. University of Nevada, Reno, NV (United States)

Publication Date:

Wed Jan 24 00:00:00 EST 2024

Research Org.:

Univ. of Rochester, NY (United States)

Sponsoring Org.:

USDOE; National Science Foundation (NSF)

OSTI Identifier:

2320236

Grant/Contract Number:  

NA0003856; AC52-07NA27344; PHY-1903355

Resource Type:

Accepted Manuscript

Journal Name:

Physical Review. E

Additional Journal Information:

Journal Volume: 109; Journal Issue: 1; Journal ID: ISSN 2470-0045

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Laser-plasma interactions; Magnetohydrodynamics; Plasma instabilities; Plasma transport; Magnetized plasma; First-principles calculations in plasma physics; Imaging & optical processing; Magnetohydrodynamic techniques; Two-fluid & multi-fluid model