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The nature and behaviour of the VH-mode, as observed in the JET tokamak, have been investigated. This is a regime of enhanced confinement which is often attained during the H-mode phase, following the disappearance of the ELMs. As a result of the high pressure gradients and the high current densities, which develop in an extended region near the separatrix during the VH-phase, a large fraction of the total plasma volume becomes unconditionally stable against ideal and resistive ballooning modes. This effect has been identified as being relevant to the attainment of the VH-mode, but a causal link has not been established. Furthermore, the processes which are responsible for the termination of the VH-mode are not understood.

Additional information

Authors: DELIYANAKIS N ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB);GREENFIELD C M, General Atomics, San Diego (US);WILSON H, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(93)82 EN (1993)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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