Nonlinear reconnecting edge localized modes in current-carrying plasmas

Ebrahimi, F.

doi:10.1063/1.4983631

Title: Nonlinear reconnecting edge localized modes in current-carrying plasmas

Journal Article · Mon May 22 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4983631· OSTI ID:1367324

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Princeton Univ., Princeton, NJ (United States). Princeton Plasma Physics Lab.

Nonlinear edge localized modes in a tokamak are examined using global three-dimensional resistive magnetohydrodynamics simulations. Coherent current-carrying filament (ribbon-like) structures wrapped around the torus are nonlinearly formed due to nonaxisymmetric reconnecting current sheet instabilities, the so-called peeling-like edge localized modes. These fast growing modes saturate by breaking axisymmetric current layers isolated near the plasma edge and go through repetitive relaxation cycles by expelling current radially outward and relaxing it back. The local bidirectional fluctuation-induced electromotive force (emf) from the edge localized modes, the dynamo action, relaxes the axisymmetric current density and forms current holes near the edge. Furthermore, the three-dimensional coherent current-carrying filament structures (sometimes referred to as 3-D plasmoids) observed here should also have strong implications for solar and astrophysical reconnection.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

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

Grant/Contract Number:: AC02-09CHI1466; SC0010565; SC0012467

OSTI ID:: 1367324

Alternate ID(s):: OSTI ID: 1361900

Journal Information:: Physics of Plasmas, Vol. 24, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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