Gyrokinetic simulations of momentum flux parasitic to free-energy transfer

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

doi:10.1063/5.0080368

Gyrokinetic simulations of momentum flux parasitic to free-energy transfer

Journal Article · Fri Mar 25 00:00:00 EDT 2022 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0080368· OSTI ID:1881311

^[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)

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.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1881311

Alternate ID(s):: OSTI ID: 1856624

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 29; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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