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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 and 1.5 to 2 times greater than the DIII-D/JET edge localised mode free H-mode scaling relation. These discharges were obtained after boronisation in DIII-D. This paper describes the characteristics of VH mode discharges, the temporal evolution and termination of the VH phase, and the parameter range over which the VH mode has been observed. In particular, the outer plasma region, including changes in electric field shear, fluctuations, diffusivity and edge plasma current density, are discussed.

Additional information

Authors: JACKSON G L ET AL., General Atomics, San Diego (US);WINTER J, Forschungszentrum Jülich GmbH (KFA) (DE);DOYLE E J, University of California at Los Angeles (US);RETTIG C, University of California at Los Angeles (US)
Bibliographic Reference: Article: Physics of Fluids B, Vol. 4 (1993) No. 7, pp. 2181-2188
Record Number: 199311556 / Last updated on: 1994-11-28
Original language: en
Available languages: en