Peaked density profiles in circular-limiter H modes on the TFTR tokamak

C. E. Bush, Robert James Goldston, S. D. Scott, E. D. Fredrickson, K. McGuire, J. Schivell, G. Taylor, Cris W. Barnes, M. G. Bell, R. L. Boivin, N. Bretz, R. V. Budny, A. Cavallo, P. C. Efthimion, B. Grek, R. Hawryluk, K. Hill, R. A. Hulse, A. Janos, D. W. JohnsonS. Kilpatrick, D. M. Manos, D. K. Mansfield, D. M. Meade, H. Park, A. T. Ramsey, B. Stratton, E. J. Synakowski, H. H. Towner, R. M. Wieland, M. C. Zarnstorff, S. Zweben

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


Circular-limiter H modes are obtained on the TFTR tokamak during high-power neutral-beam heating. The transition is usually from the supershot to the H mode rather than the usual L to H transition, and thus is obtained in a low-recycling environment with core fueling mainly from the heating beams. As a result, the density and pressure profiles are highly peaked at the center. The global confinement time E is enhanced over L-mode scaling by up to 2.5 times. The onset of edge-localized MHD modes shortly after the H-mode transition appears to limit E. Limiter H modes of up to 1.5 s duration have been realized.

Original languageEnglish (US)
Pages (from-to)424-427
Number of pages4
JournalPhysical review letters
Issue number4
StatePublished - 1990

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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