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Author(s):
M. Yagi, K. Itoh, S.-I. Itoh, A. Fukuyama and M. Azumi
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Title:
Current Diffusive Ballooning Mode in Seecond Stability Region of Tokamaks
Date of publication:
Sep. 1993
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Key words:
Ballooning instability, Thermal conductivity, Current diffusivity, Ion viscosity, Anomalous transport, Magnetic shear, Magnetic well Collisionless skin depth
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Abstract:
Stability of the current diffusive ballooning mode in tokamaks with high toroidal mode number is analyzed in the region of second-stability against the ideal magnetohydrodynamic mode. It is found that the growth rate of the current diffusive ballooning mode is decreased by the reduction of the geodesic curvature driving force. The reduction of thermal conductivity in the limit of very weak shear or negative shear in comparison with standard shear is also shown.
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