NIFS-559

FULL TEXT (PDF, 314 KB)

Author(s):

R. Horiuchi, K. Nishimura and T. Watanabe

Title:

Kinetic Stabilization of Tilt Disruption in Field-Reversed Configurations

Date of publication:

Sep. 1998

Key words:

IAEA, fusion energy conference, Yokohama

Abstract:

The kinetic stabilization process of the tilt disruption in a field-reversed configuration is investigated by means of a three-dimensional particle simulation. For the case of no ion beam the growth rate of tilt instability decreases as the plasma beta value at magnetic separatrix beta_sp increases. This stabilization effect originates from the character of anchoring ions which exist in the vicinity of the magnetic separatrix and play a role as an "anchor" to hold the internal plasma to the external plasma. The tilt mode is also found to be stabilized by injecting an ion beam with about 20% of the ion thermal energy at the neighborhood of the null point even for small beta_sp Plasmas.

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