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(THP1/11) Kinetic Stabilization of Tilt Disruption in Field-Reversed Configurations

R. Horiuchi, K. Nishimura, T. Watanabe, T. Sato

Theory and Computer Simulation Center, National Institute for Fusion Science, Toki 509-52, Japan

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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