Suppression of type-I ELMs with reduced RMP coil set on DIII-D

Orlov, Dmitriy M.; Moyer, Richard A.; Evans, Todd E.; Paz-Soldan, Carlos; Ferraro, Nathaniel M.; Nazikian, Raffi; deGrassie, John S.; Grierson, Brian A.; Eldon, David; Fenstermacher, Max E.; King, J. D.; Logan, N. C.; Lanctot, Matthew J.; Maingi, R.; Snyder, P. B.; Strait, E. J.; Wingen, Andreas

doi:10.1088/0029-5515/56/3/036020

Suppression of type-I ELMs with reduced RMP coil set on DIII-D

Journal Article · Thu Feb 18 23:00:00 EST 2016 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/56/3/036020· OSTI ID:1311248

Orlov, Dmitriy M. ^[1]; Moyer, Richard A. ^[1]; Evans, Todd E. ^[2]; Paz-Soldan, Carlos ^[2]; Ferraro, Nathaniel M. ^[2]; Nazikian, Raffi ^[3]; deGrassie, John S. ^[2]; Grierson, Brian A. ^[3]; Eldon, David ^[1]; Fenstermacher, Max E. ^[4]; King, J. D. ^[2]; Logan, N. C. ^[3]; Lanctot, Matthew J. ^[2]; Maingi, R. ^[3]; Snyder, P. B. ^[2]; Strait, E. J. ^[2]; Wingen, Andreas ^[5]

Univ. of California, San Diego, CA (United States)
General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Recent experiments on DIII-D have demonstrated that having a toroidally-monochromatic spectral content of edge-resonant magnetic perturbations (RMPs) is not a necessary condition for suppression of edge localized modes (ELMs). Robust ELM suppression has been reproducibly obtained on DIII-D during experiments in which various non-axisymmetric coil loops were turned off pseudo-randomly producing a variety of n=1 , n=2, and n=3 spectral contributions. It was demonstrated that RMP ELM suppression could be achieved with as few as 5 out of 12 internal coil loops (I-coils) on DIII-D at similar coil currents and with good plasma confinement. Linear MHD plasma response (M3DC1, IPEC, MARS) and vacuum (SURFMN, TRIP3D) modelling have been performed in order to understand the effects of the perturbation spectrum on the plasma response and ELM suppression. The results suggest that reduction of the dominant n=3 perturbation field is compensated by increased n=2 field in the plasma that may lead to RMP ELM suppression at lower levels of n=3 perturbative magnetic flux from the I-coils. In conclusion, these results provide additional confidence that ITER may be capable of RMP ELM suppression in the event of multiple internal coil failures.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC05-00OR22725; FG02-05ER54809; FC02-04ER54698; AC52-07NA27344

OSTI ID:: 1311248

Alternate ID(s):: OSTI ID: 1353064
OSTI ID: 1238386
OSTI ID: 1871406

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 3 Vol. 56; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Dynamic divertor control using resonant mixed toroidal harmonic magnetic fields during ELM suppression in DIII-D Jia, M.; Sun, Y.; Paz-Soldan, C. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5019777	journal	May 2018
Predict-first experimental analysis using automated and integrated magnetohydrodynamic modeling Lyons, B. C.; Paz-Soldan, C.; Meneghini, O. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5025838	journal	May 2018
Toroidal plasma response based ELM control coil design for EU DEMO Zhou, Lina; Liu, Yueqiang; Wenninger, Ronald Nuclear Fusion, Vol. 58, Issue 7 https://doi.org/10.1088/1741-4326/aac602	journal	June 2018
Edge localized mode suppression and plasma response using mixed toroidal harmonic resonant magnetic perturbations in DIII-D Gu, S.; Sun, Y.; Paz-Soldan, C. Nuclear Fusion, Vol. 59, Issue 2 https://doi.org/10.1088/1741-4326/aaf5a3	journal	January 2019
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

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