Evidence of toroidally localized turbulence with applied 3D fields in the DIII-D tokamak

Wilcox, R. S.; Shafer, M. W.; Ferraro, N. M.; McKee, G. R.; Zeng, L.; Rhodes, T. L.; Canik, J. M.; Paz-Soldan, C.; Nazikian, R.; Unterberg, E. A.

doi:10.1103/PhysRevLett.117.135001

Title: Evidence of toroidally localized turbulence with applied 3D fields in the DIII-D tokamak

Journal Article · Wed Sep 21 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.117.135001· OSTI ID:1326530

Wilcox, R. S. ^[1]; Shafer, M. W. ^[1]; Ferraro, N. M. ^[2]; McKee, G. R. ^[3]; Zeng, L. ^[4]; Rhodes, T. L. ^[4]; Canik, J. M. ^[1]; Paz-Soldan, C. ^[5]; Nazikian, R. ^[2]; Unterberg, E. A. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Wisconsin-Madison, Madison, WI (United States)
Univ. of California Los Angeles, Los Angeles, CA (United States)
General Atomics, San Diego, CA (United States)

New evidence indicates that there is significant 3D variation in density fluctuations near the boundary of weakly 3D tokamak plasmas when resonant magnetic perturbations are applied to suppress transient edge instabilities. The increase in fluctuations is concomitant with an increase in the measured density gradient, suggesting that this toroidally localized gradient increase could be a mechanism for turbulence destabilization in localized flux tubes. Two-fluid magnetohydrodynamic simulations find that, although changes to the magnetic field topology are small, there is a significant 3D variation of the density gradient within the flux surfaces that is extended along field lines. This modeling agrees qualitatively with the measurements. The observed gradient and asymmetries are proposed as a mechanism by which global profile gradients in the pedestal could be relaxed due to a local change in the 3D equilibrium. In conclusion, these processes may play an important role in pedestal and scrape-off layer transport in ITER and other future tokamak devices with small applied 3D fields.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC05-00OR22725; AC02-09CH11466; FG02-08ER54999; FG02-08ER54984; FC02-04ER54698

OSTI ID:: 1326530

Alternate ID(s):: OSTI ID: 1325845; OSTI ID: 1328678

Journal Information:: Physical Review Letters, Vol. 117, Issue 13; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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References (19)

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The effect of plasma shape and neutral beam mix on the rotation threshold for RMP-ELM suppression Paz-Soldan, C.; Nazikian, R.; Cui, L. Nuclear Fusion, Vol. 59, Issue 5 https://doi.org/10.1088/1741-4326/ab04c0	journal	March 2019
Direct evidence of E × B flow changes at the onset of resonant magnetic perturbation-driven edge-localized mode crash suppression Lee, Jaehyun; Jeon, Y. M.; In, Y. Nuclear Fusion, Vol. 59, Issue 6 https://doi.org/10.1088/1741-4326/ab167a	journal	May 2019
Destabilization of field-line localized density fluctuation with a 1/1 internal kink mode in the EAST tokamak Li, G. S.; Zhang, T.; Wu, M. F. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab2a42	journal	July 2019
A non-axisymmetric E × B shear inducing toroidally localized turbulence with an applied magnetic perturbation field in EAST Hu, G. H.; Chen, R.; Xu, G. S. Nuclear Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1741-4326/ab4ebf	journal	November 2019

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