Progress in the development of ELM pace-making with non-axisymmetric magnetic perturbations in NSTX

Canik, J. M.; Sontag, A. C.; Maingi, R.; Bell, R.; Gates, D. A.; Gerhardt, S. P.; Kugel, H. W.; LeBlanc, B. P.; Menard, J.; Paul, S.; Sabbagh, S.; Soukhanovskii, V. A.

doi:10.1088/0029-5515/50/6/064016

Title: Progress in the development of ELM pace-making with non-axisymmetric magnetic perturbations in NSTX

Journal Article · Fri May 28 00:00:00 EDT 2010 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/50/6/064016· OSTI ID:1898287

Canik, J. M. ^[1]; Sontag, A. C. ^[1]; Maingi, R. ^[1]; Bell, R. ^[2]; Gates, D. A. ^[2]; Gerhardt, S. P. ^[2]; Kugel, H. W. ^[2]; LeBlanc, B. P. ^[2]; Menard, J. ^[2]; Paul, S. ^[2]; Sabbagh, S. ^[3]; Soukhanovskii, V. A. ^[4]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Columbia University, New York, NY (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

The application of non-axisymmetric magnetic perturbations has been shown to destabilize edge-localized modes (ELMs) in the National Spherical Torus Experiment. This ELM-triggering effect is used to controllably introduce ELMs into lithium-enhanced ELM-free H-mode discharges, reducing the typical impurity accumulation while maintaining high energy confinement. Recent improvements to the triggering techniques are described. The perturbation waveform has been improved, with large amplitude, short duration perturbations allowing rapid, highly reliable triggering, with reduced braking of toroidal rotation. The rapid triggering allowed the ELM frequency to be increased to over 60 Hz, leading to a reduction in the average ELM size. Combined with improved gas fuelling, this method has resulted in periods of stationary global conditions, although plasma profiles do continue to evolve.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; AC05-00OR22725; AC02-09CH11466; FG02-99ER54524

OSTI ID:: 1898287

Report Number(s):: LLNL-JRNL-418584; 380381; TRN: US2310867

Journal Information:: Nuclear Fusion, Vol. 50, Issue 6; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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References (26)

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