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

T. E. Evans, R. A. Moyer, P. R. Thomas, J. G. Watkins, T. H. Osborne, J. A. Boedo, E. J. Doyle, M. E. Fenstermacher, K. H. Finken, R. J. Groebner, M. Groth, J. H. Harris, R. J. La Haye, C. J. Lasnier, S. Masuzaki, N. Ohyabu, D. G. Pretty, T. L. Rhodes, H. Reimerdes, D. L. RudakovM. J. Schaffer, G. Wang, L. Zeng

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Abstract

The large edge-localized modes (ELM) in high confinement (H-mode) plasmas were suppressed using a magnetic boundary, produced by an applied edge resonant magnetic perturbation. The magnetic perturbations were produced by a set of control coils, referred to as I coil, located inside the vacuum vessel. The plasmas used in the experiment were double null diverted discharges with a 2 cm downward shift. The results demonstrate that stochastic boundary layers are compatible with H-mode plasmas and that a stochastic layer can suppress ELMs without degrading the global particle and energy confinement.

Original languageEnglish
Article number235003
Pages (from-to)235003-1-235003-4
JournalPhysical Review Letters
Volume92
Issue number23
DOIs
StatePublished - Jun 11 2004
Externally publishedYes

Funding

Work supported by the US Department of Energy under DE-FC02-04ER54698, DE-AC04-94AL85000, W-7405-ENG-48, DE-FG02-04ER54758, DE-FG03-01ER54615, DE-FG02-89ER53297, and DE-FG03-01ER54615.

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