Internal Transport Barrier for Electrons in JT-60U Reversed Shear Discharges

Journal Article · Fri Feb 28 23:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.2377· OSTI ID:477040

Fujita, T; Ide, S; Shirai, H; Kikuchi, M; Naito, O; Koide, Y; Takeji, S; Kubo, H; Ishida, S ^[1]

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1. Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken 311-01 (Japan)

A new type of internal transport barrier (ITB) has been observed in JT-60U reversed shear discharges. It accompanies clear electron temperature and density pedestals and significant reduction of effective thermal diffusivities of electrons and ions ({chi}{sup eff}{sub e} and {chi}{sup eff}{sub i}); {chi}{sup eff}{sub e} sharply drops by a factor of 20 within 5cm while {chi}{sup eff}{sub i} is smaller than the conventional neoclassical value by a factor of 4 or more. The ratio of ion temperature to electron temperature was less than 1.5 inside the ITB. The ITB lies in the negative shear region and extended beyond 60{percent} of the plasma minor radius. High density plasmas with high confinement have been obtained with the formation of ITB. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 477040
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRIC DISCHARGES
ELECTRON TEMPERATURE
ELECTRONS
ION TEMPERATURE
JT-60U TOKAMAK
PLASMA CONFINEMENT
PLASMA PRESSURE
SHEAR PROPERTIES
TRANSPORT