Indications of an inward pinch in the inner SOL of DIII-D from 13C deposition experiments

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

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

13C methane puffing experiments were conducted on DIII-D in both L- and ELMy H-mode conditions. The puffing was toroidally symmetric into the crown of a series of well-characterized lower single-null discharges. The hydrocarbon breakup, carbon transport and deposition were modeled using the OEDGE interpretive code. Three separate hypotheses were tested using OEDGE to try to reproduce the experimental deposition: Radial variation of fast parallel flow, erosion of the puffed 13C deposited in the divertor, and a pinch in the inner scrape off layer (SOL) towards the separatrix. A fast parallel flow was imposed for all hypotheses. The magnitude and the distribution of the 13C deposition resulting from each hypothesis are compared. A fast parallel flow in the SOL toward the inner divertor combined with a pinch/drift of 10-30 m/s in the inner SOL towards the separatrix roughly reproduces the deposition in both the L- and H-mode experiments.

Original languageEnglish
Pages (from-to)376-379
Number of pages4
JournalJournal of Nuclear Materials
Volume390-391
DOIs
Publication statusPublished - 15 Jun 2009
MoE publication typeA1 Journal article-refereed

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