High performance H mode plasmas at densities above the Greenwald limit

M. A. Mahdavi, T. H. Osborne, A. W. Leonard, M. S. Chu, E. J. Doyle, M. E. Fenstermacher, G. R. McKee, G. M. Staebler, T. W. Petrie, M. R. Wade, S. L. Allen, J. A. Boedo, N. H. Brooks, R. J. Colchin, T. E. Evans, C. M. Greenfield, G. D. Porter, R. C. Isler, R. J. La Haye, C. J. LasnierR. Maingi, R. A. Moyer, M. J. Schaffer, P. G. Stangeby, J. G. Watkins, W. P. West, D. G. Whyte, N. S. Wolf

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)


Densities of up to 40% above the Greenwald limit are reproducibly achieved in high confinement (HITER89P = 2) ELMing H mode discharges. Simultaneous gas fuelling and divertor pumping were used to obtain these results. Confinement of these discharges, similar to moderate density H mode, is characterized by a stiff temperature profile, and is therefore sensitive to the density profile. A particle transport model is presented that explains the roles of divertor pumping and geometry for access to high densities. The energy loss per ELM at high density is a factor of five lower than the predictions of an earlier scaling, based on data from lower density discharges.

Original languageEnglish
Pages (from-to)52-58
Number of pages7
JournalNuclear Fusion
Issue number1
Publication statusPublished - 2002 Jan

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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