Suppression of large edge localized modes in high confinement DIII-D plasmas with a stochastic magnetic boundary

T. E. Evans*, R. A. Moyer, J. G. Watkins, P. R. Thomas, T. H. Osborne, J. A. Boedo, M. E. Fenstermacher, K. H. Finken, R. J. Groebner, M. Groth, J. Harris, G. L. Jackson, R. J. La Haye, C. J. Lasnier, M. J. Schaffer, G. Wang, L. Zeng

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

38 Citations (Scopus)

Abstract

Large 70 Hz Type-I edge localized modes (ELMs) are converted into small 130 Hz oscillations using edge resonant magnetic perturbations (RMPs) from a coil with currents ≤0.4% I p in double null DIII-D plasmas. When the RMP is properly phased with respect to the background field errors, all but a few isolated ELM-like events are suppressed. The impulsive pedestal energy loss ΔE ELM/Δt 1/2 to the scrape-of layer is reduced a factor of ≥20 relative to the Type-I ELMs and the core confinement is unaffected by the perturbation field. Significant changes in the properties of the ELMs are also observed when edge RMPs are applied to lower single null plasmas but the nature of these changes are much more complex. Both lower single null and double null plasmas are being studied to determine how ELM control techniques based on the application of edge RMPs can be expected to scale to future devices such as ITER.

Original languageEnglish
Pages (from-to)691-696
Number of pages6
JournalJournal of Nuclear Materials
Volume337-339
DOIs
Publication statusPublished - 1 Mar 2005
MoE publication typeA1 Journal article-refereed

Keywords

  • DIII-D
  • Divertor
  • Edge pedestal
  • ELM control
  • Stochastic boundary

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