The linear threshold of the ion-temperature-gradient-driven mode

Journal Article · Mon Feb 01 04:00:00 EST 1993 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860537· OSTI ID:6897739

Guo, S C; Romanelli, F ^[1]

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1. Associazione EURATOM-ENEA sulla Fusione, Centro Ricerche Energia, 00044, Frascati, Roma (Italy)

A comprehensive stability analysis of the ion-temperature-gradient-driven mode in various parameter domains is presented. The effect of parallel ion dynamics on the threshold value in toroidal geometry is investigated for the short-wavelength and finite-shear limits. A general explicit expression for the threshold is given, which is in agreement with the results obtained by solving the full integrodifferential equation. The destabilizing effect of trapped electrons below the threshold is qualitatively similar to the results of local theory, but electron collisionality has to be sufficiently weak. In the long-wavelength limit, two branches exist, respectively, toroidal and slablike in character. The toroidal branch has been investigated elsewhere [Romanelli [ital et] [ital al]., Phys. Fluids B [bold 3], 2496 (1991)]. In this paper, the stability of the slablike branch is studied both analytically and numerically. The trapped-ion effects on the threshold are discussed in detail.

• OSTI ID: 6897739
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 5:2; ISSN PFBPEI; ISSN 0899-8221
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
ANNULAR SPACE
CLOSED CONFIGURATIONS
CLOSED PLASMA DEVICES
CONFIGURATION
CONFINEMENT
DRIFT INSTABILITY
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
INSTABILITY
ION TEMPERATURE
LEPTONS
MAGNETIC FIELD CONFIGURATIONS
PLASMA CONFINEMENT
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
SPACE
TEMPERATURE GRADIENTS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TOROIDAL CONFIGURATION
TRAPPED ELECTRONS