Spontaneous transport barriers quench turbulent resistivity in two-dimensional magnetohydrodynamics

Fan, Xiang; Diamond, P. H.; Chacón, L.

doi:10.1103/PhysRevE.99.041201

Title: Spontaneous transport barriers quench turbulent resistivity in two-dimensional magnetohydrodynamics

Journal Article · Mon Apr 29 00:00:00 EDT 2019 · Physical Review E

DOI:https://doi.org/10.1103/PhysRevE.99.041201· OSTI ID:1509686

Fan, Xiang ^[1];

^[1]; Chacón, L. ^[2]

Univ. of California, San Diego, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

This Rapid Communication identifies the physical mechanism for the quench of turbulent resistivity in two-dimensional magnetohydrodynamics. Without an imposed, ordered magnetic field, a multiscale, blob-and-barrier structure of magnetic potential forms spontaneously. Magnetic energy is concentrated in thin, linear barriers, located at the interstices between blobs. The barriers quench the transport and kinematic decay of magnetic energy. The local transport bifurcation underlying barrier formation is linked to the inverse cascade of $$\langle$$A$$^{2}$$$$\rangle$$ and negative resistivity, which induce local bistability. For small-scale forcing, spontaneous layering of the magnetic potential occurs, with barriers located at the interstices between layers. This structure is effectively a magnetic staircase.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-04ER54738

OSTI ID:: 1509686

Alternate ID(s):: OSTI ID: 1509760

Journal Information:: Physical Review E, Vol. 99, Issue 4; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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