Progress in confinement and stability with plasma shape and profile control for steady-state operation in the Japan Atomic Energy Research Institute Tokamak-60 Upgrade
- Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-01 (Japan)
This paper describes the latest achievements of the Japan Atomic Energy Research Institute Tokamak-60 Upgrade (JT-60U) [H. Kimura and the JT-60 Team, Phys. Plasmas {bold 3}, 1943 (1996)] for the establishment of the physics and technology basis for steady-state, fully noninductive current-drive plasmas with high fusion performance. Recent results are highlighted by (1) high performance reversed-magnetic-shear discharges [an idealized equivalent Q{sub DT} of 1.05, a confinement-enhancement factor (H factor) of 3.23, and a normalized beta value ({beta}{sub N}) of 1.88 at I{sub p}=2.8MA/P{sub abs}=17MW]; the first observation of thermal transport barriers both for electrons and ions, (2) the first injection of negative-ion-based neutral deuterium beams in the world for studies of current drive, heating, and high-energy particle behavior (achieved so far: 2.5 MW/400 keV, design values: 10 MW/500 keV); high neutralization efficiency of 60{percent} at 370 keV; high current drive efficiency of {eta}{sub CD}=8{times}10{sup 18}m{sup {minus}2}A/W, (3) improved giant edge-localized-mode (ELM) limit and normalized beta limit by high triangularity ({delta}) shaping; the quasi-steady-state ELMy plasmas with integrated high performance were sustained for 8 times the energy confinement time ({delta}=0.35, H=2.5, {beta}{sub N}=2.5 at I{sub p}=1.5MA and B{sub t}=3.6T), and (4) enhanced divertor radiation and detached divertor in reversed-shear discharges with neon puffing, while the internal transport barrier was sustained. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 561118
- Report Number(s):
- CONF-961102-; ISSN 1070-664X; TRN: 98:000713
- Journal Information:
- Physics of Plasmas, Vol. 4, Issue 5; Conference: Meeting of the Division of Plasma Physics of the American Physical Society, Denver, CO (United States), 11-15 Nov 1996; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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