JT-60U latest results and future prospects

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860480· OSTI ID:7285403

Ninomiya, H ^[1]

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

Experimental results achieved in the initial operation of JT-60U (Plasma Devices Operat. {bold 1}, 43 (1990)) are described in this paper. Experiments of JT-60U were initiated in March and deuterium experiments started in the middle of July. Multivariable noninteracting control was adopted to allow independent control despite the strong mutual coupling between the Ohmic heating coils and the vertical field coils. Well-controlled divertor discharges were successfully obtained using this method and discharges with plasma current up to 5 MA were achieved. In neutral beam heating experiments with {ital P}{sub NBI}{approx lt}22 MW, plasma stored energies {ital W}{sub dia} of up to 4.8 MJ were obtained for 4 MA discharges. The high-{beta}{sub {ital p}} regime with hot ions and enhanced confinement was investigated. The maximum {beta}{sub {ital p}} reached 2.3, the maximum {ital T}{sub {ital i}} of 20 keV was achieved and {tau}{sub {ital E}} was improved to about 2.7 times as large as that of ITER89-P scaling (Nucl. Fusion {bold 30}, 1999 (1990)). The maximum neutron rate of 1.3{times}10{sup 16} n/sec was also obtained in the highest-{beta}{sub {ital p}} discharge. The corresponding {ital Q}{sub DD} and the equivalent {ital Q}{sub DT} were 8.9{times}10{sup {minus}4} and {similar to}0.20, respectively. Localized heat load in both toroidal and poloidal directions was clearly identified as ripple loss, and this was the first measurement of heat load mainly due to ripple trapped loss consistent with calculated results. Divertor plasma profiles measured with Langmuir probes show significant in--out asymmetry.

• OSTI ID: 7285403
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 4:7; ISSN 0899-8221; ISSN PFBPE
• 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
ELECTRIC PROBES
ELEMENTS
HEATING
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPES
JT-60 TOKAMAK
LANGMUIR PROBE
LIGHT NUCLEI
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PLASMA CONFINEMENT
PLASMA HEATING
PROBES
STABLE ISOTOPES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES