OEDGE modeling of 13C deposition in the inner divertor of DIII-D

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

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)

Abstract

Use of carbon in tokamaks leads to a major tritium retention issue due to co-deposition. To investigate this process a low power L-mode experiment was performed on DIII-D in which 13CH4 was puffed into the main vessel through the toroidally-symmetric pumping plenum at the top of lower single-null discharges. Subsequently, the 13C content of tiles taken from the vessel wall was measured. The interpretive OEDGE code was used to model the results. It was found that the 13C deposition pattern is controlled by: (a) source strength of 13C+, (b) Δrs, radial location of the 13C+ source, (c) D⊥, (d) M∥, the scrape-off layer parallel Mach number. Best agreement was found for (a) ∼50% conversion efficiency 13CH 413C+, (b) Δrs, ∼+3.5 cm (outboard of separatrix) near 13CH4 injection location, (c) D⊥ ∼ 0.3 m2/s, (d) M∥∼ 0.4 toward inside.

Original languageEnglish
Pages (from-to)79-83
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

  • Carbon Impurities
  • DIII-D
  • Edge modeling
  • Impurity transport
  • OEDGE

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    Elder, J. D., Stangeby, P. C., Whyte, D. G., Allen, S. L., McLean, A., Boedo, J. A., Bray, B. D., Brooks, N. H., Fenstermacher, M. E., Groth, M., Lasnier, C. J., Lisgo, S., Rudakov, D. L., Wampler, W. R., Watkins, J. G., & West, W. P. (2005). OEDGE modeling of 13C deposition in the inner divertor of DIII-D. Journal of Nuclear Materials, 337-339(1-3), 79-83. https://doi.org/10.1016/j.jnucmat.2004.10.138