Gas puff fueled H-mode discharges with good energy confinement above the Greenwald density limit on DIII-D

T. H. Osborne, M. A. Mahdavi, M. Chu, M. E. Fenstermacher, R. La Haye, A. W. Leonard, G. McKee, T. W. Petrie, C. Rettig, M. Wade, J. Watkins

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Tokamak discharges with electron densities as high as 1.4 times the Greenwald density, and good energy confinement, HITER89P = 1.9, were obtained with D2 gas puffing on DIII-D. The divertor configuration of these discharges, low triangularity with pumping of the private flux region, was important in avoiding a transition to the L-mode or Type III ELM regimes in which energy confinement was reduced. Although these discharges show a decrease in H-mode pedestal energy at high density through reduction in the edge pressure gradient, peaking of the density profile compensated for the effect of this decrease on the overall stored energy. Spontaneous density profile peaking occurred under conditions which enhance the neoclassical Ware pinch. The high density phase was terminated by an internal MHD event that has the characteristics of a neoclassical tearing mode.

Original languageEnglish
Pages (from-to)1013-1017
Number of pages5
JournalJournal of Nuclear Materials
Volume290-293
DOIs
Publication statusPublished - 2001 Mar

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Gas puff fueled H-mode discharges with good energy confinement above the Greenwald density limit on DIII-D'. Together they form a unique fingerprint.

Cite this