NIFS-288

FULL TEXT (PDF, 561 KB)


Author(s):

K. Itoh, A. Fukuyama, S.-I. Itoh, M. Yagi and M. Azumi

Title:

Self-Sustained Magnetic Braiding in Toroidal Plasmas

Date of publication:

July 1994

Key words:

magnetic braiding, anomalous transport, current diffusivity, interchange mode turbulence, magnetic well, cusp-type catastrophe

Abstract:

Theory for the magnetic braiding in toroidal plasmas, which is caused by microscopic pressure-gradient-driven turbulence, is developed. When the pressure gradient exceeds a threshold, the self-sustaining of the magnetic braiding and enhanced anomalous transport occur. The balance between the nonlinear destabilization and nonlinear stabilization, which determines the stationary turbulence, is solved analytically for the case of interchange mode. The enhanced thermal conductivity and magnetic perturbation amplitude as well as the threshold pressure gradient are obtained. Cusp-type catastrophe is predicted, allowing the abrupt burst of magnetic perturbations.

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