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Multiscale magnetic field structures in an expanding elongated plasma cloud with hot electrons subject to an external magnetic field

Published online by Cambridge University Press:  31 May 2022

M.A. Garasev Open the ORCID record for M.A. Garasev [Opens in a new window] ,
A.A. Nechaev Open the ORCID record for A.A. Nechaev [Opens in a new window] ,
A.N. Stepanov Open the ORCID record for A.N. Stepanov [Opens in a new window] ,
V.V. Kocharovsky Open the ORCID record for V.V. Kocharovsky [Opens in a new window]  and
Vl.V. Kocharovsky Open the ORCID record for Vl.V. Kocharovsky [Opens in a new window]
M.A. Garasev
Affiliation:
Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950, Russia
A.A. Nechaev
Affiliation:
Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950, Russia
A.N. Stepanov
Affiliation:
Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950, Russia
V.V. Kocharovsky
Affiliation:
Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA
Vl.V. Kocharovsky*
Affiliation:
Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950, Russia
*
†Email address for correspondence: kochar@ipfran.ru
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Abstract

We carry out three-dimensional and two-dimensional particle-in-cell simulations of the expansion of a magnetized plasma that initially uniformly fills a half-space and contains a semicylindrical region of heated electrons elongated along the surface of the plasma boundary. This geometry is related, for instance, to ablation of a plane target by a femtosecond laser beam under quasi-cylindrical focusing. We find that a decay of the inhomogeneous plasma–vacuum discontinuity is strongly affected by an external magnetic field parallel to its boundary. We observe various transient phenomena, including an anisotropic scattering of electrons and an accompanying Weibel instability, and reveal various spatial structures of the arising magnetic field and current, including multiple flying-apart filaments of a Z-pinch type and slowly evolving current sheets with different orientations. The magnitude of the self-generated magnetic field can be of the order of, or significantly exceed that of, the external one. Such phenomena are expected in the laser and cosmic plasmas, including the explosive processes in the planetary magnetospheres and stellar coronal arches.

Keywords

plasma nonlinear phenomenaplasma simulationplasma instabilities
Type
Letter
Information
Journal of Plasma Physics , Volume 88 , Issue 3 , June 2022 , 175880301
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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References

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