Confinement and divertor studies in Japan Tokamak JT-60U

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860725· OSTI ID:6366426

Hosogane, N ^[1]

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

This paper presents confinement characteristics of H mode and high [beta][sub [ital P]] mode in Japan Tokamak JT-60U [Plasma Devices Operat. [bold 1], 43 (1990)], effects of current profiles, pressure profiles and sawtooth oscillations on the operational limits and energy confinement, and divertor characteristics. The operational regime required for core plasma performance and divertor conditions is discussed on the basis of the experimental results. The main parameters achieved in confinement studies are [ital T][sub [ital i]](0)=38 keV, [ital n][sub [ital d]](0)[ital T][sub [ital i]](0)[tau][sup global][sub [ital E]] [similar to] 4.4[times]10[sup 20] m[sup [minus]3] sec keV, H factor [l brace]defined by [tau][sub [ital E]]/[tau][sup ITER89P L mode][sub [ital E]] [Nucl. Fusion [bold 30], 1999 (1990)][r brace][similar to]3 at [epsilon][beta][sub [ital P]][similar to]0.5 in high [beta][sub [ital P]] mode and [ital n][sub [ital d]](0)[ital T][sub [ital i]](0)[tau][sup global][sub [ital E]] [similar to] 2.5 [times] 20[sup 20] m[sup [minus]3] sec keV in H-mode discharges with [ital B][sub [ital T]]=4.2 T. Advantages of high [ital q] operation are suggested from studies on operational regime and confinement. The divertor study shows that a parameter [ital n][sub [ital e]] [ital q][sub eff] ([ital q][sub eff]: effective safety factor) plays a role in characterizing divertor actions such as relaxing of heat flux profiles, radiation loss and deuterium recycling. High [ital n][sub [ital e]] [ital q][sub eff] operation is shown to be essential for the alleviation of heat load on the divertor.

• OSTI ID: 6366426
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 5:7; ISSN 0899-8221; ISSN PFBPEI
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700310* -- Plasma Confinement-- (1992-)
CLOSED PLASMA DEVICES
CONFINEMENT
DEUTERIUM
DIVERTORS
FUSION YIELD
HIGH-BETA PLASMA
HYDROGEN ISOTOPES
ION TEMPERATURE
ISOTOPES
LIGHT NUCLEI
NUCLEAR REACTION YIELD
NUCLEI
ODD-ODD NUCLEI
PLASMA
PLASMA CONFINEMENT
PLASMA PRESSURE
STABLE ISOTOPES
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTORS
TOKAMAK DEVICES
YIELDS