Comparison of local and global gyrokinetic calculations of collisionless zonal flow damping in quasi-symmetric stellarators
Abstract
The linear collisionless damping of zonal flows is calculated for quasi-symmetric stellarator equilibria in flux-tube, flux-surface, and full-volume geometry. Equilibria are studied from the quasi-helical symmetry configuration of the Helically Symmetric eXperiment (HSX), a broken symmetry configuration of HSX, and the quasi-axial symmetry geometry of the National Compact Stellarator eXperiment (NCSX). Zonal flow oscillations and long-time damping affect the zonal flow evolution, and the zonal flow residual goes to zero for small radial wavenumber. The oscillation frequency and damping rate depend on the bounce-averaged radial particle drift in accordance with theory. While each flux tube on a flux surface is unique, several different flux tubes in HSX or NCSX can reproduce the zonal flow damping from a flux-surface calculation given an adequate parallel extent. The flux-surface or flux-tube calculations can accurately reproduce the full-volume long-time residual for moderate kx, but the oscillation and damping time scales are longer in local representations, particularly for small kx approaching the system size.
- Authors:
-
[1];
[2];
[2];
[3];
- Univ. of Wisconsin, Madison, WI (United States)
- Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain). Laboratorio Nacional de Fusión
- AJ Eindhoven (Netherlands); Dutch Inst. for Fundamental Energy Research Eindhoven Univ. of Technology, Eindhoven (Netherlands); Univ. of Texas, Austin, TX (United States). Insti. for Fusion Studies
- Publication Date:
- Research Org.:
- Univ. of Texas, Austin, TX (United States); Univ. of Wisconsin, Madison, WI (United States); Univ. of California, Oakland, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1849560
- Alternate Identifier(s):
- OSTI ID: 1774688
- Grant/Contract Number:
- FG02-04ER54742; FG02-93ER54222; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 28; Journal Issue: 4; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Physics; Plasma confinement; Plasma flows; Flux tubes; Stellarators; Magnetic fields; Plasma simulation; Gyrokinetic simulations; Quasisymmetric
Citation Formats
Smoniewski, J., Sánchez, E., Calvo, I., Pueschel, M. J., and Talmadge, J. N. Comparison of local and global gyrokinetic calculations of collisionless zonal flow damping in quasi-symmetric stellarators. United States: N. p., 2021.
Web. doi:10.1063/5.0038841.
Smoniewski, J., Sánchez, E., Calvo, I., Pueschel, M. J., & Talmadge, J. N. Comparison of local and global gyrokinetic calculations of collisionless zonal flow damping in quasi-symmetric stellarators. United States. https://doi.org/10.1063/5.0038841
Smoniewski, J., Sánchez, E., Calvo, I., Pueschel, M. J., and Talmadge, J. N. Tue .
"Comparison of local and global gyrokinetic calculations of collisionless zonal flow damping in quasi-symmetric stellarators". United States. https://doi.org/10.1063/5.0038841. https://www.osti.gov/servlets/purl/1849560.
@article{osti_1849560,
title = {Comparison of local and global gyrokinetic calculations of collisionless zonal flow damping in quasi-symmetric stellarators},
author = {Smoniewski, J. and Sánchez, E. and Calvo, I. and Pueschel, M. J. and Talmadge, J. N.},
abstractNote = {The linear collisionless damping of zonal flows is calculated for quasi-symmetric stellarator equilibria in flux-tube, flux-surface, and full-volume geometry. Equilibria are studied from the quasi-helical symmetry configuration of the Helically Symmetric eXperiment (HSX), a broken symmetry configuration of HSX, and the quasi-axial symmetry geometry of the National Compact Stellarator eXperiment (NCSX). Zonal flow oscillations and long-time damping affect the zonal flow evolution, and the zonal flow residual goes to zero for small radial wavenumber. The oscillation frequency and damping rate depend on the bounce-averaged radial particle drift in accordance with theory. While each flux tube on a flux surface is unique, several different flux tubes in HSX or NCSX can reproduce the zonal flow damping from a flux-surface calculation given an adequate parallel extent. The flux-surface or flux-tube calculations can accurately reproduce the full-volume long-time residual for moderate kx, but the oscillation and damping time scales are longer in local representations, particularly for small kx approaching the system size.},
doi = {10.1063/5.0038841},
journal = {Physics of Plasmas},
number = 4,
volume = 28,
place = {United States},
year = {Tue Apr 06 00:00:00 EDT 2021},
month = {Tue Apr 06 00:00:00 EDT 2021}
}
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