Gyrokinetic simulations of momentum flux parasitic to free-energy transfer

Stoltzfus-Dueck, Timothy; Hornsby, W. A.; Grosshauser, S. R.

doi:10.1063/5.0080368

Title: Gyrokinetic simulations of momentum flux parasitic to free-energy transfer

Abstract

Ion Landau damping interacts with a portion of the E × B drift to cause a nondiffusive outward flux of co-current toroidal angular momentum. Quantitative evaluation of this momentum flux requires nonlinear simulations to determine f_L, the fraction of fluctuation free energy that passes through ion Landau damping, in fully developed turbulence. Nonlinear gyrokinetic simulations with the GKW code confirm the presence of the systematic symmetry-breaking momentum flux. For simulations with adiabatic electrons, f_L scales inversely with the ion temperature gradient, because only the ion curvature drift can transfer free energy to the electrostatic potential. Although kinetic electrons should, in principle, relax this restriction, the ion Landau damping measured in collisionless kinetic-electron simulations remained at low levels comparable with ion-curvature-drift transfer, except when magnetic shear $$\hat{s}$$ was strong. A set of simulations scanning the electron pitch-angle scattering rate showed only a weak variation of f_L with the electron collisionality. Still, collisional-electron simulations with electron temperature greater than ion temperature unambiguously showed electron-curvature-drift transfer supporting ion Landau damping, leading to a corresponding enhancement of the symmetry-breaking momentum flux.

Authors:

^[1]; Hornsby, W. A. ^[2]; Grosshauser, S. R. ^[3]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Max Planck Institute for Plasma Physics, Garching (Germany)
Univ. of Bayreuth (Germany)

Publication Date:: Fri Mar 25 00:00:00 EDT 2022

Research Org.:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1881311

Alternate Identifier(s):: OSTI ID: 1856624

Grant/Contract Number:: AC02-09CH11466

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 29; Journal Issue: 3; 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; plasma confinement; plasma flows; tokamaks; gyrokinetic simulations; flow dynamics; electrostatics; transport properties; toroidal rotation; intrinsic rotation; rotation reversal

Citation Formats


                    Stoltzfus-Dueck, Timothy, Hornsby, W. A., and Grosshauser, S. R. Gyrokinetic simulations of momentum flux parasitic to free-energy transfer.  United States: N. p., 2022. 
Web.  doi:10.1063/5.0080368.

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                    Stoltzfus-Dueck, Timothy, Hornsby, W. A., & Grosshauser, S. R. Gyrokinetic simulations of momentum flux parasitic to free-energy transfer.  United States.  https://doi.org/10.1063/5.0080368

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                    Stoltzfus-Dueck, Timothy, Hornsby, W. A., and Grosshauser, S. R. Fri .  
"Gyrokinetic simulations of momentum flux parasitic to free-energy transfer".  United States.  https://doi.org/10.1063/5.0080368.  https://www.osti.gov/servlets/purl/1881311.

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@article{osti_1881311,

  title        = {Gyrokinetic simulations of momentum flux parasitic to free-energy transfer},

  author       = {Stoltzfus-Dueck, Timothy and Hornsby, W. A. and Grosshauser, S. R.},

  abstractNote = {Ion Landau damping interacts with a portion of the E × B drift to cause a nondiffusive outward flux of co-current toroidal angular momentum. Quantitative evaluation of this momentum flux requires nonlinear simulations to determine fL, the fraction of fluctuation free energy that passes through ion Landau damping, in fully developed turbulence. Nonlinear gyrokinetic simulations with the GKW code confirm the presence of the systematic symmetry-breaking momentum flux. For simulations with adiabatic electrons, fL scales inversely with the ion temperature gradient, because only the ion curvature drift can transfer free energy to the electrostatic potential. Although kinetic electrons should, in principle, relax this restriction, the ion Landau damping measured in collisionless kinetic-electron simulations remained at low levels comparable with ion-curvature-drift transfer, except when magnetic shear $\hat{s}$ was strong. A set of simulations scanning the electron pitch-angle scattering rate showed only a weak variation of fL with the electron collisionality. Still, collisional-electron simulations with electron temperature greater than ion temperature unambiguously showed electron-curvature-drift transfer supporting ion Landau damping, leading to a corresponding enhancement of the symmetry-breaking momentum flux.},

  doi          = {10.1063/5.0080368},

  journal      = {Physics of Plasmas},

  number       = 3,

  volume       = 29,

  place        = {United States},

  year         = {Fri Mar 25 00:00:00 EDT 2022},

  month        = {Fri Mar 25 00:00:00 EDT 2022}

}

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