Enhanced Confinement and Stability in DIII-D Discharges with Reversed Magnetic Shear
- 11 December 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 75 (24), 4421-4424
- https://doi.org/10.1103/physrevlett.75.4421
Abstract
Peaked pressure profiles and central ion temperatures up to 20 keV are observed in DIII-D -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, , up to 4 (%--T/MA), energy confinement are a factor of 3 better than 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.
Keywords
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