Compatibility of the radiating divertor with high performance plasmas in DIII-D

T. W. Petrie*, M. R. Wade, N. H. Brooks, M. E. Fenstermacher, M. Groth, A. W. Hyatt, R. C. Isler, C. J. Lasnier, A. W. Leonard, M. A. Mahdavi, G. D. Porter, M. J. Schaffer, J. G. Watkins, W. P. West, DIII-D Team

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

37 Citations (Scopus)

Abstract

A radiating divertor approach was successfully applied to high performance 'hybrid' plasmas [M.R. Wade et al., in: Proceedings of the 20th IAEA Fusion Energy Conference, Vilamoura, Portugal, 2004]. Our techniques included: (1) injecting argon near the outer divertor target, (2) enhancing the plasma flow into the inner and outer divertors by a combination of particle pumping and deuterium gas puffing upstream of the divertor targets, and (3) isolating the inner divertor from the outer by a structure in the private flux region. Good hybrid conditions were maintained, as the peak heat flux at the outer divertor target was reduced by a factor of 2.5; the peak heat flux at the inner target decreased by 20%. This difference was caused by a higher concentration of argon at the outer target than at the inner target. Argon accumulation in the main plasma was modest (nAr/ne ≤ 0.004 on axis), although the argon profile was more peaked than the electron profile.

Original languageEnglish
Pages (from-to)416-420
Number of pages5
JournalJournal of Nuclear Materials
Volume363-365
DOIs
Publication statusPublished - 15 Jun 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • Argon
  • DIII-D
  • Divertor
  • Divertor plasma
  • Impurity screening

Fingerprint

Dive into the research topics of 'Compatibility of the radiating divertor with high performance plasmas in DIII-D'. Together they form a unique fingerprint.

Cite this