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Title: Influence of 3D plasmoid dynamics on the transition from collisional to kinetic reconnection

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.5100737· OSTI ID:1558975

Within the resistive magnetohydrodynamic model, high-Lundquist number reconnection layers are unstable to the plasmoid instability, leading to a turbulent evolution where the reconnection rate can be independent of the underlying resistivity. However, the physical relevance of these results remains questionable for many applications. First, the reconnection electric field is often well above the runaway limit, implying that collisional resistivity is invalid. Furthermore, both theory and simulations suggest that plasmoid formation may rapidly induce a transition to kinetic scales, due to the formation of thin current sheets. Here, this problem is studied for the first time using a first-principles kinetic simulation with a Fokker-Planck collision operator in 3D. The low-β reconnecting current layer thins rapidly due to Joule heating before the onset of the oblique plasmoid instability. Linear growth rates for standard (ky = 0) tearing modes agree with semicollisional boundary layer theory, but the angular spectrum of oblique (|ky|>0) modes is significantly narrower than predicted. In the nonlinear regime, flux-ropes formed by the instability undergo complex interactions as they are advected and rotated by the reconnection outflow jets, leading to a turbulent state with stochastic magnetic field. In a manner similar to previous 2D results, super-Dreicer fields induce a transition to kinetic reconnection in thin current layers that form between flux-ropes. These results may be testable within new laboratory experiments.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC). Fusion Energy Sciences (FES) (SC-24); USDOE
Grant/Contract Number:
89233218CNA000001; FES17LANL02
OSTI ID:
1558975
Alternate ID(s):
OSTI ID: 1545908
Report Number(s):
LA-UR-19-23318; TRN: US2000271
Journal Information:
Physics of Plasmas, Vol. 26, Issue 7; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (4)

Formation of Power-law Electron Energy Spectra in Three-dimensional Low- β Magnetic Reconnection journal October 2019
The Interplay of Magnetically Dominated Turbulence and Magnetic Reconnection in Producing Nonthermal Particles journal November 2019
Spectropolarimetric Insight into Plasma Sheet Dynamics of a Solar Flare journal December 2019
Topological Analysis of Magnetic Reconnection in Kinetic Plasma Simulations conference October 2020

Figures / Tables (10)


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