Transport and deposition of 13C from methane injection into partially detached H-mode plasmas in DIII-D

W. R. Wampler*, A. G. McLean, S. L. Allen, N. H. Brooks, J. D. Elder, M. E. Fenstermacher, M. Groth, P. C. Stangeby, W. P. West, D. G. Whyte

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)

Abstract

Experiments are described which examine the transport and deposition of carbon entering the main plasma scrape-off layer in DIII-D. 13CH4 was injected from a toroidally symmetric source into the crown of lower single-null partially detached ELMy H-mode plasmas. 13C deposition, mapped by nuclear reaction analysis of tiles, was high at the inner divertor but absent at the outer divertor, as found previously for low-density L-mode plasmas. This asymmetry indicates that ionized carbon is swept towards the inner divertor by a fast flow in the scrape-off layer. In the private flux region between inner and outer strike points, carbon deposition was low for L-mode but high for the H-mode plasmas. OEDGE modeling reproduces observed deposition patterns and indicates that neutral carbon dominates deposition in the divertor from detached H-mode plasmas.

Original languageEnglish
Pages (from-to)72-77
Number of pages6
JournalJournal of Nuclear Materials
Volume363-365
Issue number1-3
DOIs
Publication statusPublished - 15 Jun 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • CH injection
  • C0100
  • DIII-D
  • Erosion/deposition
  • F0400
  • Impurity transport
  • Nuclear reaction analysis
  • P0500
  • R0900

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