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

Journal Article · Fri Dec 01 04:00:00 EST 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.75.4421· OSTI ID:277344

Strait, E J; Lao, L L; Mauel, M E; Rice, B W; Taylor, T S; Burrell, K H; Chu, M S; Lazarus, E A; Osborne, T H; Thompson, S J; Turnbull, A D ^[1]

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1. General Atomics, P.O. Box 85608, San Diego, California 92186-9784 (United States)

Peaked pressure profiles and central ion temperatures up to 20 keV are observed in DIII-D {ital 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, {beta}{sub {ital N}}={beta}{ital aB}/{ital I}, up to 4 ({percent}-{ital m}-T/MA), energy confinement are a factor of 3 better than {ital L} mode, and at least 50{percent} of the noninductive plasma current in this regime demonstrates compatibility with requirements for a steady-state high-beta tokamak power plant. {copyright} {ital 1995 The American Physical Society.}

• Research Organization: General Atomics
• DOE Contract Number: AC03-89ER51114; AC05-84OR21400; FG02-89ER53297; W-7405-ENG-48
• OSTI ID: 277344
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 75; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COMPATIBILITY
ENERGY
H-MODE PLASMA CONFINEMENT
ION TEMPERATURE
IONIZATION
MAGNETIC PROPERTIES
MHD EQUILIBRIUM
PLASMA PRESSURE
SHEAR
STABILITY
TOKAMAK DEVICES
WAVELENGTHS