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

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17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)S309-S312
JournalJournal of Nuclear Materials
Volume438
Issue numberSUPPL
DOIs
Publication statusPublished - 2013 Jan 1

ASJC Scopus subject areas

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

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