Enhanced confinement and stability in DIII-D discharges with reversed magnetic shear

E. J. Strait, L. L. Lao, M. E. Mauel, B. W. Rice, T. S. Taylor, K. H. Burrell, M. S. Chu, E. A. Lazarus, T. H. Osborne, S. J. Thompson, A. D. Turnbull

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532 Citations (Scopus)

Abstract

Peaked pressure profiles and central ion temperatures up to 20 keV are observed in DIII-D H-mode discharges with a central region of strongly reversed magnetic shear. Short wavelength ballooning modes are stabilized by access to the second stable regime, longer wavelength modes by a conducting wall and possibly by rotational shear. Values of normalized beta, N=aBI, up to 4 (%-m-T/MA), energy confinement are a factor of 3 better than L mode, and at least 50% of the noninductive plasma current in this regime demonstrates compatibility with requirements for a steady-state high-beta tokamak power plant.

Original languageEnglish
Pages (from-to)4421-4424
Number of pages4
JournalPhysical review letters
Volume75
Issue number24
DOIs
Publication statusPublished - 1995

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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