Second stable regime of mixed slab-toroidal ITG mode with anisotropic {eta}{sub i}

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:489450

Song, H; Sen, A K ^[1]

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1. Columbia Univ., New York, NY (United States)

The mixed slab-toroidal ITG instability with anisotropic {eta}{sub i} is investigated with both analytical and numerical approaches. Local analysis clearly indicates a second stable regime at high {eta}{sub i{perpendicular}} Non-local effects of magnetic shear and magnetic drifts in a toroidal system are considered via a perturbation technique. It is seen that the second stability regime is expanded due to these non-local effects. In addition to the perturbation method described above, a comprehensive numerical code, for high-n linear eigenmodes using the ballooning representation, is used to investigate the possible second stability regime for a set of parameters in TFTR. Although the code is designed to include some complex effects that cannot be accurately handled with the simple theoretical model discussed above, its result reveals the same important physics result that there is restabilization of the mode at high {eta}{sub i{perpendicular}} indicative of a second stable regime. From a strictly theoretical point of view, this result provides a possible stabilization scheme for the ITG instability.

• DOE Contract Number: FG02-87ER53257
• OSTI ID: 489450
• Report Number(s): CONF-960354--
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANISOTROPY
ION TEMPERATURE
PLASMA INSTABILITY
TEMPERATURE GRADIENTS
TFTR TOKAMAK