Variation in particle pumping due to changes in topology in high performance DIII-D plasmas

T. W. Petrie*, N. H. Brooks, M. E. Fenstermacher, C. M. Greenfield, M. Groth, A. W. Hyatt, A. W. Leonard, M. A. Mahdavi, G. D. Porter, M. E. Rensink, M. J. Schaffer, M. R. Wade, J. G. Watkins, N. S. Wolf, DIII-D Team

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

Recent experiments on DIII-D point to the importance of two factors in determining the rate at which deuterium particles can be pumped at the divertor target(s): (1) the divertor magnetic balance, i.e., the degree to which the divertor topology is single-null (SN) or double-null (DN), and (2) the direction of the of B × ∇B ion drift with respect to the X-point(s). Changes in divertor magnetic balance near the DN shape have a much stronger effect on the pumping rate at the inner divertor target(s) than on the pumping rate at the outer divertor target(s). The behavior in the particle pumping observed at the inner and outer divertor target(s) in the DN and near-DN shapes suggests a redistribution of particles that would be expected in the presence of B × ∇B and E × B ion particle drifts in the scrapeoff layer (SOL) and divertor(s).

Original languageEnglish
Pages (from-to)216-220
Number of pages5
JournalJournal of Nuclear Materials
Volume337-339
DOIs
Publication statusPublished - 1 Mar 2005
MoE publication typeA1 Journal article-refereed

Keywords

  • Divertor asymmetry
  • Divertor pumping
  • Magnetic topology
  • Particle drifts
  • Recycling

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    Petrie, T. W., Brooks, N. H., Fenstermacher, M. E., Greenfield, C. M., Groth, M., Hyatt, A. W., Leonard, A. W., Mahdavi, M. A., Porter, G. D., Rensink, M. E., Schaffer, M. J., Wade, M. R., Watkins, J. G., Wolf, N. S., & Team , DIII-D. (2005). Variation in particle pumping due to changes in topology in high performance DIII-D plasmas. Journal of Nuclear Materials, 337-339, 216-220. https://doi.org/10.1016/j.jnucmat.2004.10.063