Very high confinement discharges in DIII-D after boronization

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

DOI:https://doi.org/10.1063/1.860485· OSTI ID:7034337

Jackson, G L; Winter, J; Taylor, T S; Greenfield, C M; Burrell, K H; Carlstrom, T N; DeBoo, J C; Doyle, E J; Groebner, R J; Lao, L L; Rettig, C; Schissel, D P; Strait, E J ^[1]

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1. General Atomics, San Diego, California 92138 (United States)

A regime of very high confinement (VH mode) has recently been observed in DIII-D with global energy confinement times up to a factor of 3.5 above the ITER89-P L-mode scaling (Nucl. Fusion {bold 30}, 1999 (1990)) and 1.5 to 2 times greater than the DIII-D/JET edge-localized-mode-free H-mode scaling relation (Nucl. Fusion {bold 31}, 73 (1991)). These discharges were obtained after boronization in DIII-D and are characterized by low radiated power and {ital Z}{sub eff}, increasing confinement time during the VH phase of the discharge and low Ohmic target density. The low radiated power and {ital Z}{sub eff} are a consequence of the boronization. During the VH phase these discharges exhibit an inward shift in the region of highest electric field shear and a large calculated edge bootstrap current. The outer region ({rho}{approx gt}0.85) is calculated to be in the second stable regime to ideal ballooning modes.

• DOE Contract Number: AC03-89ER51114
• OSTI ID: 7034337
• 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-)
BALLOONING INSTABILITY
BORON
CLOSED PLASMA DEVICES
CONFINEMENT
CONFINEMENT TIME
ELEMENTS
HEATING
INSTABILITY
PLASMA CONFINEMENT
PLASMA HEATING
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
SCALING LAWS
SEMIMETALS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES