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T. Hayashi, N. Mizuguchi, T.-H. Watanabe,
Y. Todo, T. Sato, and the Complexity Simulation Group
National Institute for Fusion Science, Toki 509-5292, Japan
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
similar growth rates. Spontaneous phase-alignment mechanism among those
excited modes is found in the nonlinear stage of the development, which
causes bulge-like deformation of the torus and subsequent expulsion of heat
energy to the ambient region through occurrence of external reconnection.
IAEA 2001
