Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D

Wade, M. R.; Nazikian, R.; deGrassie, John S.; Evans, T. E.; Ferraro, N. M.; Moyer, R. A.; Orlov, D. M.; Buttery, R. J.; Fenstermacher, Max E.; Garofalo, Andrea M.; Lanctot, M. A.; McKee, George R.; Osborne, T. H.; Shafer, M. A.; Solomon, W. M.; Snyder, P. B.; Suttrop, Wolfgang; Wingen, Andreas; Unterberg, Ezekial A.; Zeng, L.

doi:10.1088/0029-5515/55/2/023002

Title: Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D

Journal Article · Wed Jan 14 00:00:00 EST 2015 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/55/2/023002· OSTI ID:1265638

Wade, M. R. ^[1]; Nazikian, R. ^[2]; deGrassie, John S. ^[1]; Evans, T. E. ^[1]; Ferraro, N. M. ^[1]; Moyer, R. A. ^[3]; Orlov, D. M. ^[3]; Buttery, R. J. ^[1]; Fenstermacher, Max E. ^[4]; Garofalo, Andrea M. ^[1]; Lanctot, M. A. ^[1]; McKee, George R. ^[5]; Osborne, T. H. ^[1]; Shafer, M. A. ^[6]; Solomon, W. M. ^[2]; Snyder, P. B. ^[1]; Suttrop, Wolfgang ^[7]; Wingen, Andreas ^[6]; Unterberg, Ezekial A. ^[6]; Zeng, L. ^[8]

General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of California, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Wisconsin, Madison, WI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Max-Planck-Institut fur Plasmaphysik, Garching (Germany). IPP-Garching
Univ. of California, Los Angeles, CA (United States)

We report recent experiments on DIII-D have increased confidence in the ability to suppress edge-localized modes (ELMs) using edge-resonant magnetic perturbations (RMPs) in ITER, including an improved physics basis for the edge response to RMPs as well as expansion of RMP ELM suppression to more ITER-like conditions. Complete ELM suppression has been achieved utilizing n = 3 RMPs in the ITER baseline scenario. In addition, RMP ELM suppression has been expanded to include plasmas with helium concentrations near 25% and the use of n = 2 RMPs. Analysis of the kinetic profile response suggests that ELM suppression is correlated with the co-alignment of the ω_⊥e = 0 location, an n = 3 rational surface, and the top of the pedestal. Modelling predicts that such a co-alignment could potentially lead to island (or island chain) formation just inside the top of the pedestal, inhibiting the growth of the pedestal and thereby maintaining the ELM-free state. Detailed analysis of data obtained during toroidal phase variations of the applied n = 3 RMPs have provided further evidence of an island-like structure at the top of the pedestal. In addition, nearly matched discharges with co-neutral-beam-injection (co-NBI) and counter-NBI have demonstrated the importance of the presence of the ω_⊥e = 0 location for ELM suppression. In the counter-NBI cases, the toroidal rotation profile is such that there is no ω_⊥e = 0 location and ELMs are not suppressed in conditions in which ELM suppression is generally observed with co-NBI.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC05-00OR22725; AC02-09CH11466; AC52-07NA27344; FC02-04ER54698; FG02-07ER54917; FG02-08ER54984; FG02-89ER53296; FG02-08ER54999

OSTI ID:: 1265638

Alternate ID(s):: OSTI ID: 1260806; OSTI ID: 1351086; OSTI ID: 1871390

Report Number(s):: LLNL-JRNL-834461; GA-A27695

Journal Information:: Nuclear Fusion, Vol. 55, Issue 2; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 68 works

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