Impact of resonant magnetic perturbations on zonal flows and microturbulence
Abstract
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.
- Authors:
-
[3];
[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)
- Publication Date:
- Research Org.:
- 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 Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1799655
- Alternate Identifier(s):
- OSTI ID: 1644222
- Grant/Contract Number:
- FC02-04ER54698; FG02-04ER54742; FG02-08ER54999; FG02-85ER53212; SC0018036; FG02-04ER-54742; FG02-85ER-53212
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 60; Journal Issue: 9; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Physics
Citation Formats
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., and Nogami, S. H. Impact of resonant magnetic perturbations on zonal flows and microturbulence. United States: N. p., 2020.
Web. doi:10.1088/1741-4326/ab9be7.
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. Impact of resonant magnetic perturbations on zonal flows and microturbulence. United States. https://doi.org/10.1088/1741-4326/ab9be7
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., and Nogami, S. H. Tue .
"Impact of resonant magnetic perturbations on zonal flows and microturbulence". United States. https://doi.org/10.1088/1741-4326/ab9be7. https://www.osti.gov/servlets/purl/1799655.
@article{osti_1799655,
title = {Impact of resonant magnetic perturbations on zonal flows and microturbulence},
author = {Williams, Z. R. and Pueschel, M. J. and Terry, P. W. and Nishizawa, T. and Kriete, D. M. and Nornberg, M. D. and Sarff, J. S. and McKee, G. R. and Orlov, D. M. and Nogami, S. H.},
abstractNote = {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.},
doi = {10.1088/1741-4326/ab9be7},
journal = {Nuclear Fusion},
number = 9,
volume = 60,
place = {United States},
year = {Tue Jul 28 00:00:00 EDT 2020},
month = {Tue Jul 28 00:00:00 EDT 2020}
}
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