Modeling and analysis of surface roughness effects on sputtering, reflection and sputtered particle transport

J. N. Brooks, D. N. Ruzic

Research output: Contribution to journalArticle

Abstract

The microstructure of the redeposited surface in tokamaks may affect sputtering and reflection properties and subsequent particle transport. This subject has been studied numerically using coupled models/codes for near-surface plasma particle kinetic transport (WBC code) and rough surface sputtering (fractal-TRIM). The coupled codes provide an overall Monte Carlo calculation of the sputtering cascade resulting from an initial flux of hydrogen ions. Beryllium, carbon, and tungsten surfaces are analyzed for typical high recycling, oblique magnetic field, divertor conditions. Significant variations in computed sputtering rates are found with surface roughness. Beryllium exhibits high D-T and self-sputtering coefficients for the plasma regime studied (Te = 30-75 eV). Carbon and tungsten sputtering is significantly lower.

Original languageEnglish (US)
Pages (from-to)278-282
Number of pages5
JournalJournal of Nuclear Materials
Volume176-177
Issue numberC
DOIs
StatePublished - Dec 3 1990

ASJC Scopus subject areas

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

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