Magnetic stochasticity and transport due to nonlinearly excited subdominant microtearing modes

Hatch, D. R.; Pueschel, M. J.; Jenko, F.; Nevins, W. M.; Terry, P. W.; Doerk, H.

doi:10.1063/1.4789448

Title: Magnetic stochasticity and transport due to nonlinearly excited subdominant microtearing modes

Journal Article · Thu Jan 31 00:00:00 EST 2013 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4789448· OSTI ID:1565001

Hatch, D. R. ^[1]; Pueschel, M. J. ^[2]; Jenko, F. ^[1]; Nevins, W. M. ^[3]; Terry, P. W. ^[2]; Doerk, H. ^[1]

Max Planck Inst. for Plasma Physics, Garching (Germany)
Univ. of Wisconsin, Madison, WI (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Subdominant, linearly stable microtearing modes are identified as the main mechanism for the development of magnetic stochasticity and transport in gyrokinetic simulations of electromagnetic ion temperature gradient driven plasma microturbulence. The linear eigenmode spectrum is examined in order to identify and characterize modes with tearing parity. Connections are demonstrated between microtearing modes and the nonlinear fluctuations that are responsible for the magnetic stochasticity and electromagnetic transport, and nonlinear coupling with zonal modes is identified as the salient nonlinear excitation mechanism. A simple model is presented, which relates the electromagnetic transport to the electrostatic transport. These results may provide a paradigm for the mechanisms responsible for electromagnetic stochasticity and transport, which can be examined in a broader range of scenarios and parameter regimes.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1565001

Journal Information:: Physics of Plasmas, Vol. 20, Issue 1; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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