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Title: The role of guide field on magnetic reconnection during island coalescence

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4976712· OSTI ID:1369174

A number of studies have considered how the rate of magnetic reconnection scales in large and weakly collisional systems by the modelling of long reconnecting current sheets. However, this set-up neglects both the formation of the current sheet and the coupling between the diffusion region and a larger system that supplies the magnetic flux. Recent studies of magnetic island merging, which naturally include these features, have found that ion kinetic physics is crucial to describe the reconnection rate and global evolution of such systems. In this paper, the effect of a guide field on reconnection during island merging is considered. In contrast to the earlier current sheet studies, we identify a limited range of guide fields for which the reconnection rate, outflow velocity, and pile-up magnetic field increase in magnitude as the guide field increases. The Hall-MHD fluid model is found to reproduce kinetic reconnection rates only for a sufficiently strong guide field, for which ion inertia breaks the frozen-in condition and the outflow becomes Alfvénic in the kinetic system. The merging of large islands occurs on a longer timescale in the zero guide field limit, which may in part be due to a mirror-like instability that occurs upstream of the reconnection region.

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:
AC52-06NA25396
OSTI ID:
1369174
Alternate ID(s):
OSTI ID: 1349353
Report Number(s):
LA-UR-16-28828
Journal Information:
Physics of Plasmas, Vol. 24, Issue 2; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (8)

MMS Multi‐Point Analysis of FTE Evolution: Physical Characteristics and Dynamics journal July 2019
On the role of system size in Hall MHD magnetic reconnection journal February 2018
Study of magnetic reconnection in large-scale magnetic island coalescence via spatially coupled MHD and PIC simulations journal August 2018
Turbulent electromagnetic fields at sub-proton scales: Two-fluid and full-kinetic plasma simulations journal January 2019
Wavelet methods for studying the onset of strong plasma turbulence journal December 2018
Plasma Energization in Colliding Magnetic Flux Ropes journal October 2018
Turbulent electromagnetic fields at sub-proton scales: two-fluid and full-kinetic plasma simulations text January 2018
Wavelet Methods for Studying the Onset of Strong Plasma Turbulence text January 2018

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