rf stabilization of external kink modes in the presence of a resistive wall

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859502· OSTI ID:6329618

Goedbloed, J P ^[1]; D'Ippolito, D A ^[2]

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1. Association Euratom-FOM, FOM-Instituut voor Plasmafysica, Rijnhuizen, Nieuwegein (The Netherlands)
2. Lodestar Research Corporation, Boulder, CO (USA)

The problem of controlling external kink instabilities that arise on the slow time scale characteristic of magnetic field diffusion through a conducting wall with finite resistivity is considered. An expression for the growth rate of these resistive wall'' kink modes is derived in a low-beta cylindrical tokamak model assuming a thin wall and small resistivity, including the additional stabilizing effect of a spatially localized, externally applied surface force. It is shown that the marginal stability condition is identical to that of the ideal kink in the absence of a conducting wall. The model is applied to ponderomotive stabilization arising from the near field of an ion-Bernstein-wave (IBW) antenna system. It is found that radio-frequency (rf) fields below the marginal stability threshold can significantly reduce the growth rate of the {ital m}=2 instability. The required rf fields can be attained using present IBW antennas with {Omega}{sub {ital i}}{approx lt}{omega}{lt}2{Omega}{sub {ital i}} in tokamaks with relatively low magnetic fields and may therefore be useful for high-beta and second-stability studies.

• DOE Contract Number: FG02-88ER53263
• OSTI ID: 6329618
• Journal Information: Physics of Fluids B; (USA), Journal Name: Physics of Fluids B; (USA) Vol. 2:10; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
700108 -- Fusion Energy-- Plasma Research-- Wave Phenomena
ANTENNAS
CLOSED PLASMA DEVICES
CONFIGURATION
CYLINDRICAL CONFIGURATION
ELECTRIC CONDUCTIVITY
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
EQUATIONS
EQUIPMENT
INSTABILITY
INSTABILITY GROWTH RATES
KINK INSTABILITY
MAGNETIC FIELDS
PHYSICAL PROPERTIES
PLASMA
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
RF SYSTEMS
STABILIZATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
WALLS