Comparison of local and global gyrokinetic calculations of collisionless zonal flow damping in quasi-symmetric stellarators

Smoniewski, J.; Sánchez, E.; Calvo, I.; Pueschel, M. J.; Talmadge, J. N.

doi:10.1063/5.0038841

Comparison of local and global gyrokinetic calculations of collisionless zonal flow damping in quasi-symmetric stellarators

Journal Article · Tue Apr 06 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0038841· OSTI ID:2567581

; ; ; ; Talmadge, J. N.

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.

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Research Organization:: Univ. of California, Oakland, CA (United States); Univ. of Texas, Austin, TX (United States); Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231; FG02-04ER54742; FG02-93ER54222

OSTI ID:: 2567581

Alternate ID(s):: OSTI ID: 1849560
OSTI ID: 1774688

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 28; ISSN 1070-664X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Comparison of local and global gyrokinetic calculations of collisionless zonal flow damping in quasi-symmetric stellarators

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