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A regime of very high confinement (VH-mode) has been observed in divertor discharges in DIII-D. The VH-mode, first seen following the initial boronisation of the DIII-D vessel in 1991, exhibits total energy confinement a factor of 2.5 to 3.5 greater than thatpredicted by the ITER89-P L-mode scaling relation. Also, confinement of thermal energy alone is greater than 1.6 times that of the JET/DIII-D H-mode scaling and in many cases has exceeded twice that amount. This report presents some of the results of experimentation and analysis in this field, detailing some of the characteristics of VH-mode and making comparisons with the H-mode where appropriate.

Additional information

Authors: GREENFIELD C M ET AL., General Atomics, San Diego (US);RETTIG C, University of California, Los Angeles (US);WINTER J, Kernforschungsanlage Jülich GmbH, Institut für Plasmaphysik, Jülich (DE)
Bibliographic Reference: Report: GA-A20917 EN (1992) 4 pp.
Availability: Available from General Atomics, P.O. Box 85608, San Diego, CA 92186-9784 (US)
Record Number: 199211067 / Last updated on: 1994-11-29
Original language: en
Available languages: en