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

Abstract

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.

Authors:
; ;  [1]; ;  [2];  [3]
+ Show Author Affiliations
  1. Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, 85748 Garching (Germany)
  2. University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
  3. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
22113345
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 20; Journal Issue: 1; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; EXCITATION; FLUCTUATIONS; ION TEMPERATURE; NONLINEAR PROBLEMS; PARITY; PLASMA; PLASMA SIMULATION; SIMULATION; SPECTRA; STOCHASTIC PROCESSES; TEARING INSTABILITY; TEMPERATURE GRADIENTS; TURBULENCE

Citation Formats

Hatch, D. R., Jenko, F., Doerk, H., Pueschel, M. J., Terry, P. W., and Nevins, W. M. Magnetic stochasticity and transport due to nonlinearly excited subdominant microtearing modes. United States: N. p., 2013. Web. doi:10.1063/1.4789448.
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Hatch, D. R., Jenko, F., Doerk, H., Pueschel, M. J., Terry, P. W., & Nevins, W. M. Magnetic stochasticity and transport due to nonlinearly excited subdominant microtearing modes. United States. https://doi.org/10.1063/1.4789448
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Hatch, D. R., Jenko, F., Doerk, H., Pueschel, M. J., Terry, P. W., and Nevins, W. M. 2013. "Magnetic stochasticity and transport due to nonlinearly excited subdominant microtearing modes". United States. https://doi.org/10.1063/1.4789448.
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@article{osti_22113345,
title = {Magnetic stochasticity and transport due to nonlinearly excited subdominant microtearing modes},
author = {Hatch, D. R. and Jenko, F. and Doerk, H. and Pueschel, M. J. and Terry, P. W. and Nevins, W. M.},
abstractNote = {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.},
doi = {10.1063/1.4789448},
url = {https://www.osti.gov/biblio/22113345}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 1,
volume = 20,
place = {United States},
year = {Tue Jan 15 00:00:00 EST 2013},
month = {Tue Jan 15 00:00:00 EST 2013}
}
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Journal Article:
https://doi.org/10.1063/1.4789448
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Works referencing / citing this record:

On the linear stability of collisionless microtearing modes
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Magnetic island evolution in the presence of ion-temperature gradient-driven turbulence
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Interchange destabilization of collisionless tearing modes by temperature gradient
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The development of magnetic field line wander by plasma turbulence
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Interchange destabilization of collisionless tearing modes by temperature gradient
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