Effect of plasma shape on particle flux and particle removal in DIII-D

J. G. Watkins, T. W. Petrie, C. J. Lasnier, S. L. Allen, M. E. Fenstermacher, T. C. Luce, M. A. Mahdavi, R. Maingi, L. W. Owen, M. E. Rensink, M. R. Wade

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

Measurements from balanced or slightly unbalanced, double-null, ELMing H-mode plasmas show that the upper, more closed, divertor strike point particle fluxes are larger than the lower, more open, divertor strike point particle fluxes for comparable conditions. Comparison of the upper and lower outer strike point peak particle fluxes measured with Langmuir probes during scans of the magnetic balance shows an asymmetry around the magnetic balance point which is consistent with both the enhanced upper recycling and the expected direction of private region E × B drifts. Comparison of the inner and outer peak particle fluxes in the upper divertor shows a dependence on magnetic field direction that is also consistent with the private region E × B drift direction.

Original languageEnglish
Pages (from-to)1258-1261
Number of pages4
JournalJournal of Nuclear Materials
Volume313-316
Issue numberSUPPL.
DOIs
StatePublished - Mar 2003
EventPlasma - Surface Interactions in Controlled Fusion Devices - Gifu, Japan
Duration: May 26 2002May 31 2002

Funding

Work supported by US Department of Energy under contracts DE-AC04-94AL85000, DE-AC03-99ER54463, W-7405-ENG-48 and DE-AC05-00OR22725.

Keywords

  • Double-null
  • Langmuir probes
  • Magnetic balance
  • Particle flux
  • Recycling
  • Tokamak

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