Far scrape-off layer and near wall plasma studies in DIII-D

D. L. Rudakov*, J. A. Boedo, R. A. Moyer, N. H. Brooks, R. P. Doerner, T. E. Evans, M. E. Fenstermacher, M. Groth, E. M. Hollmann, S. Krasheninnikov, C. J. Lasnier, M. A. Mahdavi, G. R. McKee, A. McLean, P. C. Stangeby, W. R. Wampler, J. G. Watkins, W. P. West, D. G. Whyte, C. P C Wong

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

Far scrape-off layer (SOL) plasma parameters in DIII-D depend strongly on the discharge density and confinement regime. In L-mode, cross-field transport increases with the average discharge density and elevates the far SOL density, thus increasing plasma-wall contact. Far SOL density near the low field side (LFS) of the main chamber wall also increases with decreasing plasma current and with decreasing outer wall gap. In H-mode, between edge localized modes (ELMs), plasma-wall contact is weaker than in L-mode. During ELMs plasma fluxes to the LFS wall increase to, or above the L-mode levels. A large fraction of the net cross-field fluxes is convected through the SOL by large amplitude intermittent transport events. In high-density L-mode and during ELMs in H-mode, intermittent events propagate all the way to the LFS wall and may cause sputtering.

Original languageEnglish
Pages (from-to)717-721
Number of pages5
JournalJournal of Nuclear Materials
Volume337-339
Issue number1-3
DOIs
Publication statusPublished - 1 Mar 2005
MoE publication typeA1 Journal article-refereed

Keywords

  • Cross-field transport
  • DIII-D
  • Edge plasma
  • Intermittent transport
  • Probes

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