Title: The Influence of the Hall Term on the Development of Magnetized Laser-Produced Plasma Jets

Abstract

We present 2D axisymmetric simulation results describing the influence of the Hall term on laser-produced plasma jets and their interaction with an applied magnetic field parallel to the laser axis. Bending of the poloidal B-field lines produces an MHD shock structure surrounding a conical cavity, and a jet is produced from the convergence of the shock envelope. Both the jet and the conical cavity underneath it are bound by fast MHD shocks. We compare the MHD results generated using the extended-MHD code Physics as an Extended-MHD Relaxation System with an Efficient Upwind Scheme (PERSEUS) with MHD results generated using GORGON and find reasonable agreement. We then present extended-MHD results generated using PERSEUS, which show that the Hall term has several effects on the plasma jet evolution. A hot low-density current-carrying layer of plasma develops just outside the plume, which results in a helical rather than a purely poloidal B-field, and reduces magnetic stresses, resulting in delayed flow convergence and jet formation. The flow is partially frozen into the helical field, resulting in azimuthal rotation of the jet. The Hall term also produces field-aligned current in strongly magnetized regions. In particular, we find the influence of Hall physics on this problemmore » to be scale-dependent. In conclusion, this points to the importance of mitigating the Hall effect in a laboratory setup, by increasing the jet density and system dimensions, in order to avoid inaccurate extrapolation to astrophysical scales.« less

Authors:

Hamlin, N.D.  ^[1];

• Search DOE PAGES for author "Hamlin, N.D."
• Search DOE PAGES for ORCID "0000-0003-0920-8054"

Seyler, C. E.  ^[1];

• Search DOE PAGES for author "Seyler, C. E."
• Search DOE PAGES for ORCID "0000-0003-0505-0771"

Khiar, B. ^[2]

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+ Show Author Affiliations

1. Cornell Univ., Ithaca, NY (United States). School of Electrical and Computer Engineering
2. Centre National de la Recherche Scientifique (CNRS), Paris (France). LERMA, Observatoire de Paris; PSL Research Univ., Paris (France); Sorbonne Univ., Paris (France)

Publication Date:

Sun Apr 29 00:00:00 EDT 2018

Research Org.:

Cornell Univ., Ithaca, NY (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1435720

Alternate Identifier(s):

OSTI ID: 1434831

Grant/Contract Number:  

NA0003764; NA0001836

Resource Type:

Accepted Manuscript

Journal Name:

Physics of Plasmas

Additional Journal Information:

Journal Volume: 25; Journal Issue: 4; Journal ID: ISSN 1070-664X

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

70 PLASMA PHYSICS AND FUSION TECHNOLOGY