Application of the radiating divertor approach to innovative tokamak divertor concepts

T. W. Petrie, S. L. Allen, M. E. Fenstermacher, R. J. Groebner, C. T. Holcomb, E. Kolemen, R. J. La Haye, C. J. Lasnier, A. W. Leonard, T. C. Luce, A. G. McLean, R. Maingi, R. A. Moyer, W. M. Solomon, V. A. Soukhanovskii, F. Turco, J. G. Watkins

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Abstract

Abstract We survey the results of recent DIII-D experiments that tested the effectiveness of three innovative tokamak divertor concepts in reducing divertor heat flux while still maintaining acceptable energy confinement under neon/deuterium-based radiating divertor (RD) conditions: (1) magnetically unbalanced high performance double-null divertor (DND) plasmas, (2) high performance double-null "Snowflake" (SF-DN) plasmas, and (3) single-null H-mode plasmas having different isolation from their divertor targets. In general, all three concepts adapt well to RD conditions, achieving significant reduction in divertor heat flux (q⊥p) and maintaining high performance metrics, e.g., 50-70% reduction in peak divertor heat flux for DND and SF-DN plasmas that are characterized by βN ≅ 3.0 and H98(y,2) ≈ 1.35. It is also demonstrated that q ≅p could be reduced ≈50% by extending the parallel connection length (L||-XPT) in the scrape-off layer between the X-point and divertor targets over a variety of the RD and non-RD environments tested.

Original languageEnglish (US)
Article number48602
Pages (from-to)1225-1228
Number of pages4
JournalJournal of Nuclear Materials
Volume463
DOIs
StatePublished - Jul 22 2015

All Science Journal Classification (ASJC) codes

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

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    Petrie, T. W., Allen, S. L., Fenstermacher, M. E., Groebner, R. J., Holcomb, C. T., Kolemen, E., La Haye, R. J., Lasnier, C. J., Leonard, A. W., Luce, T. C., McLean, A. G., Maingi, R., Moyer, R. A., Solomon, W. M., Soukhanovskii, V. A., Turco, F., & Watkins, J. G. (2015). Application of the radiating divertor approach to innovative tokamak divertor concepts. Journal of Nuclear Materials, 463, 1225-1228. [48602]. https://doi.org/10.1016/j.jnucmat.2014.11.008