Advances in the modeling of chemical erosion/redeposition of carbon divertors and application to the JET tritium codeposition problem

J. N. Brooks, A. Kirschner, D. G. Whyte, D. N. Ruzic, D. A. Alman

Research output: Contribution to journalConference article

Abstract

We have improved the modeling of chemically eroded carbon transport and applied this to JET and ITER. New features are: (1) coupled REDEP and ERO-JET impurity transport code calculations for sputtered wall/divertor carbon, (2) MolDyn molecular dynamics calculations of carbon/hydrocarbon particle reflection at hydrogen-saturated carbon surfaces, (3) ADAS full collisional radiative carbon ion recombination rate coefficients. At low incident particle energies relevant to chemical-erosion (∼0.1-15 eV), we predict high reflection coefficients (∼20-100%), implying more net erosion and T/C codeposition than for full-sticking models. Calculated tritium codeposition rates for the JET MkIIA divertor, using 'reference' chemical erosion yields of order 1% - while higher than previously estimated are well short (X ∼ 1/40) of published data. Possible explanations include much higher chemical erosion yields.

Original languageEnglish (US)
Pages (from-to)424-428
Number of pages5
JournalJournal of Nuclear Materials
Volume313-316
Issue numberSUPPL.
DOIs
StatePublished - Mar 1 2003
EventPlasma - Surface Interactions in Controlled Fusion Devices - Gifu, Japan
Duration: May 26 2002May 31 2002

Keywords

  • Carbon
  • Codeposition/tritium
  • Erosion/redeposition
  • ITER
  • JET
  • REDEP code

ASJC Scopus subject areas

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

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