低アスペクト比トカマクにおけるティルト不安定性とその安定化に関するMHDシミュレーション

概要

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The stabilization of the n=1 tilt instability by the toroidal field coil current(I_tf)is investigated for low aspect ratio tokamaks. The tilt motions are simulated with a three dimensional MHD code. When the plasma separatrixes are completely detached from the conductive walls(free boundary case), or partially touch only the center conductive wall(center fixed boundary case), the values of I_tf/I_p that stabilize the tilt motion are in good agreement with those by the simple rigid body model. When the whole plasma surface is in contact with the surrounding wall(totally fixed boundary case), the required I_tf/I_p for the stabilization is significantly reduced by the presence of the surrounding wall. In free boundary cases and center fixed boundary cases, the edge q(q_90)values are less than 1.1 when low aspect tokamaks are tilt-stabilized by I_tf.
1998-11-25