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A regime of very high confinement (VH-mode) ions was observed in the boronised DIII-D tokamak, during which the confinement was seen to exceed 3.5 times that of the ITER89-P L-mode scaling relation. In this ELM-free phase, confinement was seen to increase with time, and was terminated by a global MHD event which was associated with high beta. Low radiated power, Z(eff), and a low fast-ion fraction are amongst the characteristics of VH-mode discussed in this paper.

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Authors: GREENFIELD C M ET AL., General Atomics, San Diego (US);RETTIG C, University of California, Los Angeles (US);WINTER J, Forschungszentrum Jülich GmbH (DE)
Bibliographic Reference: Article: Proceedings of the 19th Conference on Controlled Fusion and Plasma Physics, Vol. 1 (1992) pp. 11-14
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