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23 April 2024 |
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Dynamics of a relativistic velocity collisionless ionization wave in an applied magnetic field | | Haotian Mao
; Kathleen Weichman
; Zheng Gong
; Todd Ditmire
; Hernan Quevedo
; Alexey Arefiev
; | | Date: |
7 Aug 2020 | | Abstract: | Using simulations, we demonstrate that an applied 100~T-level magnetic field
can restrict the expansion of a relativistic, high energy density plasma into a
surrounding neutral gas. Without any applied magnetic field, an initial plasma
filament launches a sustained, soliton-like collisionless ionization wave. This
ionization wave traps hot electrons and can enable the rapid transport of a
significant fraction of the original filament energy over hundreds of microns,
in contrast with plasma expansion into vacuum. We find that the introduction of
an applied magnetic field causes the ionization wave to lose energy, allowing
the plasma expansion to be terminated by experimentally relevant magnetic field
strengths. Using 1D particle-in-cell simulations, we demonstrate that the
stopping of the ionization wave in an applied magnetic field is well-predicted
by tracking the evolution of the ratio of thermal to magnetic pressure at the
ionization wave front. | | Source: | arXiv, 2008.02920 | | Services: | Forum | Review | PDF | Favorites | |
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