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, Ming-Sheng Chu, E. A. Lazarus, T. H. Osborne, S. J. Thompson, A. D. Turnbull

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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 Jan 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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