An experimental comparison of gross and net erosion of Mo in the DIII-D divertor

P. C. Stangeby, D. L. Rudakov, W. R. Wampler, J. N. Brooks, N. H. Brooks, D. A. Buchenauer, J. D. Elder, A. Hassanein, A. W. Leonard, A. G. McLean, A. Okamoto, T. Sizyuk, J. G. Watkins, C. P.C. Wong

研究成果: Article査読

17 被引用数 (Scopus)

抄録

Experimental observation of net erosion of molybdenum being significantly reduced compared to gross erosion in the divertor of DIII-D is reported for well-controlled plasma conditions. For the first time, gross erosion rates were measured by both spectroscopic and non-spectroscopic methods. In one experiment a net erosion rate of 0.73 ± 0.03 nm/s was measured using ion beam analysis (IBA) of a 1 cm diameter Mo-coated sample. For a 1 mm diameter Mo sample exposed at the same time the net erosion rate was higher at 1.31 nm/s. For the small sample redeposition is expected to be negligible in comparison with the larger sample yielding a net to gross erosion estimate of 0.56 ± 12%. The gross rate was also measured spectroscopically (386 nm MoI line) giving 2.45 nm/s ± factor 2. The experiment was modeled with the REDEP/WBC erosion/redeposition code package coupled to the ITMC-DYN mixed-material code, with plasma conditions supplied by the OEDGE code using Langmuir probe data input. The code-calculated net/gross ratio is =0.46, in good agreement with experiment.

本文言語English
ページ(範囲)S309-S312
ジャーナルJournal of Nuclear Materials
438
SUPPL
DOI
出版ステータスPublished - 2013 1 1

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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