The long-wavelength limit of the ion-temperature gradient mode in tokamak plasmas

Journal Article · Fri Mar 01 00:00:00 EST 1991 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859859· OSTI ID:5618417

Chen, L; Briguglio, S; Romanelli, F ^[1]

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1. Associazione EURATOM-ENEA sulla Fusione, Centro Ricerche Energia Frascati, C.P. 65-00044 Frascati, Rome, Italy (IT)

The stability of the ion-temperature gradient ({del}{ital T}{sub {ital i}}) mode in tokamak geometries is examined in the limit of long wavelength and flat density, retaining the nonadiabatic electron response. The existence of three unstable branches is shown. The toroidicity-induced {del}{ital T}{sub {ital i}} branch tends to be stabilized for increasing wavelength by the finite {epsilon}{sub {ital T}{sub {ital i}}}({epsilon}{sub {ital T}{sub {ital i}} }= {ital L}{sub {ital T}{sub {ital i}}}/{ital R}) corrections. Meanwhile, the slablike {del}{ital T}{sub {ital i}} branch remains unstable and is little affected by the electron dynamics. The third branch corresponds to toroidicity-induced {del}{ital T}{sub {ital i}} eigenmodes propagating, however, in the electron diamagnetic direction, which are destabilized by the nonadiabatic electron dynamics. At shorter wavelengths, the toroidicity-induced {del}{ital T}{sub {ital i}} branch remains strongly unstable, while the other two branches become stabilized.

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 5618417
• Journal Information: Physics of Fluids B; (USA), Vol. 3:3; ISSN 0899-8221
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA
TEMPERATURE GRADIENTS
TOKAMAK DEVICES
PLASMA MACROINSTABILITIES
BALLOONING INSTABILITY
EIGENVALUES
ELECTRON DRIFT
FLUTE INSTABILITY
ION TEMPERATURE
TOROIDAL CONFIGURATION
ANNULAR SPACE
CLOSED CONFIGURATIONS
CLOSED PLASMA DEVICES
CONFIGURATION
INSTABILITY
MAGNETIC FIELD CONFIGURATIONS
PLASMA INSTABILITY
SPACE
THERMONUCLEAR DEVICES
700107* - Fusion Energy- Plasma Research- Instabilities