Impurity transport in ohmic and neutral-beam-heated TFTR discharges

B. C. Stratton, S. A. Cohen, F. P. Boody, C. E. Bush, R. Ellis, R. J. Fonck, E. Fredrickson, R. J. Groebner, K. W. Hill, R. A. Hulse, E. S. Marmar, A. T. Ramsey, J. F. Schivell, S. S. Sesnic, J. Timberlake

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Abstract

Impurity transport has been studied in ohmic and neutral-beam-heated TFTR discharges by observation and numerical modeling of time evolutions of emissions from germanium injected using the laser-blowoff method. VUV spectral lines, the total radiated power, and soft X-ray intensities are compared with code predictions in which the impurity flux is assumed to have diffusive and convective terms. In plasmas with Ip = 1.4 MA and ne ≈ 2.5 × 1013 cm-3, no difference in transport between ohmic and beam-heated discharges is observed. At Ip = 0.7 MA and ne ≈ 1.0 × 1013 cm-3, a three-fold increase in the diffusion coefficient is found during beam heating.

Original languageEnglish (US)
Pages (from-to)587-591
Number of pages5
JournalJournal of Nuclear Materials
Volume145-147
Issue numberC
DOIs
StatePublished - Feb 2 1987

All Science Journal Classification (ASJC) codes

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

Keywords

  • convection
  • diffusion coefficients
  • impurity dynamics
  • impurity fluxes

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