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Author(s):
T. Hayashi, N. Mizuguchi, T-H. Watanabe, T. Sato and the Complexity Simulation Group
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Title:
Nonlinear Simulations of Internal Reconnection Event in Spherical Tokamak
Date of publication:
Oct. 1998
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Key words:
IAEA, fusion energy conference, Yokohama
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Abstract:
Three dimensional magnetohydrodynamic simulations are executed in a full toroidal geometry to clarify the physical mechanisms of the Internal Reconnection Event (IRE), which is observed in the spherical tokamak experiments. The simulation results reproduce several main properties of IRE. The noticeable property in the linear growth of modes are the simultaneous excitation of multiple low n modes, which grow together with the similar growth rates. Spontaneous phase-alignment mechanism among those exited modes is found in the nonlinear stage of the development, which causes bulge-like deformation of torus and subsequent expulsion of heat energy to ambient region.
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