The VH-mode at JET
- 1 July 1994
- journal article
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
- Vol. 36 (7) , 1159-1169
- https://doi.org/10.1088/0741-3335/36/7/005
Abstract
The nature and behaviour of the VH-mode, as observed in the JET tokamak, have been investigated; this is a regime of enhanced energy 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.Keywords
This publication has 7 references indexed in Scilit:
- Investigations of VH-mode in DIII-D and JETPlasma Physics and Controlled Fusion, 1993
- Particle and energy transport during the first tritium experiments on JETNuclear Fusion, 1993
- Regime of very high confinement in the boronized DIII-D tokamakPhysical Review Letters, 1991
- Resistive ballooning modes in a separatrix equilibriumPlasma Physics and Controlled Fusion, 1991
- Generalization of the ballooning Delta ' to poloidally asymmetric Tokamak equilibriaPlasma Physics and Controlled Fusion, 1990
- Analytic theory of resistive ballooning modesPhysics of Fluids, 1985
- High mode number stability of an axisymmetric toroidal plasmaProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1979