Impact of resonant magnetic perturbations on zonal flows and microturbulence

Williams, Z. R.; Pueschel, M. J.; Terry, P. W.; Nishizawa, T.; Kriete, D. M.; Nornberg, M. D.; Sarff, J. S.; McKee, G. R.; Orlov, D. M.; Nogami, S. H.

doi:10.1088/1741-4326/ab9be7

Title: Impact of resonant magnetic perturbations on zonal flows and microturbulence

Journal Article · Tue Jul 28 00:00:00 EDT 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab9be7· OSTI ID:1799655

Williams, Z. R. ^[1]; Pueschel, M. J. ^[2]; Terry, P. W. ^[3];

^[3]; Kriete, D. M. ^[3];

^[3]; Sarff, J. S. ^[3]; McKee, G. R. ^[3];

^[4];

^[5]

Hope College, Holland, MI (United States); Univ. of Wisconsin, Madison, WI (United States)
Univ. of Texas, Austin, TX (United States)
Univ. of Wisconsin, Madison, WI (United States)
Univ. of San Diego, San Diego, CA (United States)
West Virginia Univ., Morgantown, WV (United States)

Results from a joint experimental and computational effort studying the effect of resonant magnetic perturbations (RMPs) on microturbulence levels and their connection to zonal flows in the DIII-D tokamak L-mode are presented. Beam emission spectroscopy measurements show a direct increase in density fluctuations at microturbulent scales with increasing RMP amplitude, suggesting that magnetic activity introduced by the RMP affects the regulation of microturbulence on DIII-D. This is analogous to how MHD-scale magnetic fluctuations arising from tearing modes have been observed in simulations to increase microturbulence levels in the reversed-field pinch (RFP). In the RFP, this is attributed to magnetic fluctuations eroding turbulence-limiting zonal flows; this work examines if a similar mechanism is present for DIII-D microturbulence. Gyrokinetic simulations find that the application of an RMP corresponds directly to a decrease in zonal flow levels, producing a similar increase of turbulent fluctuation levels over a range of RMP amplitudes as observed in the experiment.

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Research Organization:: General Atomics, San Diego, CA (United States); Univ. of Texas, Austin, TX (United States); Univ. of Wisconsin, Madison, WI (United States); West Virginia Univ., Morgantown, WV (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FC02-04ER54698; FG02-04ER54742; FG02-08ER54999; FG02-85ER53212; SC0018036; FG02-04ER-54742; FG02-85ER-53212

OSTI ID:: 1799655

Alternate ID(s):: OSTI ID: 1644222

Journal Information:: Nuclear Fusion, Vol. 60, Issue 9; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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