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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];  [1];  [3];  [2];  [1]
  1. Max Planck Inst. for Plasma Physics, Garching (Germany)
  2. Univ. of Wisconsin, Madison, WI (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1565001
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 20; Journal Issue: 1; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Physics

Citation Formats

Hatch, D. R., Pueschel, M. J., Jenko, F., Nevins, W. M., Terry, P. W., and Doerk, H. Magnetic stochasticity and transport due to nonlinearly excited subdominant microtearing modes. United States: N. p., 2013. Web. doi:10.1063/1.4789448.
Hatch, D. R., Pueschel, M. J., Jenko, F., Nevins, W. M., Terry, P. W., & Doerk, H. Magnetic stochasticity and transport due to nonlinearly excited subdominant microtearing modes. United States. doi:10.1063/1.4789448.
Hatch, D. R., Pueschel, M. J., Jenko, F., Nevins, W. M., Terry, P. W., and Doerk, H. Thu . "Magnetic stochasticity and transport due to nonlinearly excited subdominant microtearing modes". United States. doi:10.1063/1.4789448. https://www.osti.gov/servlets/purl/1565001.
@article{osti_1565001,
title = {Magnetic stochasticity and transport due to nonlinearly excited subdominant microtearing modes},
author = {Hatch, D. R. and Pueschel, M. J. and Jenko, F. and Nevins, W. M. and Terry, P. W. and Doerk, H.},
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},
journal = {Physics of Plasmas},
number = 1,
volume = 20,
place = {United States},
year = {2013},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
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Citation Metrics:
Cited by: 24 works
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Figures / Tables:

FIG. 1 FIG. 1: Extended parallel mode structures representative of ballooning parity ((A) and (B)), tearing parity ((C) and (D)), and mixed parity ((E) and (F)). The mixed-parity mode is an ITG mode centered at $k$$x$$ρ$$s$ = 0.124.

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