Physics of the H-mode
Conference
·
OSTI ID:6713275
A theoretical picture of the H-mode is proposed, which explains some of the most important features of this good confinement mode in neutral beam heated plasmas with divertors. From a consideration of the transport through the separatrix and along the open field lines outside the separatrix, as well as the stability of the plasma inside the separatrix, we show that a bifurcation in the operating parameters is possible. At high edge temperatures, very large particle confinement times are possible because of the Ware pinch. The transport of particles and heat along the open field lines to the divertor region depends on temperature in a non-monotonic way, and the bifurcation of the thermal equilibrium which is implied may correspond to the L- to H-mode transition. The improvement of the interior confinement in the H-mode, when the edge temperature is higher, is shown to follow from the tearing mode stability properties of current profiles with pedestals.
- Research Organization:
- Maryland Univ., College Park (USA)
- DOE Contract Number:
- AT03-84ER53158
- OSTI ID:
- 6713275
- Report Number(s):
- GA-A-17645; CONF-840910-2; ON: DE84014883
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700105* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Theoretical-- (-1987)
BEAM INJECTION
CLOSED PLASMA DEVICES
CONFINEMENT
DIVERTORS
ELECTRON TEMPERATURE
INSTABILITY
NEUTRAL ATOM BEAM INJECTION
PLASMA
PLASMA CONFINEMENT
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
TEARING INSTABILITY
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRANSPORT THEORY
700105* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Theoretical-- (-1987)
BEAM INJECTION
CLOSED PLASMA DEVICES
CONFINEMENT
DIVERTORS
ELECTRON TEMPERATURE
INSTABILITY
NEUTRAL ATOM BEAM INJECTION
PLASMA
PLASMA CONFINEMENT
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
TEARING INSTABILITY
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRANSPORT THEORY