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(TH3/3) Nonlinear Simulations of Internal Reconnection Event in Spherical Tokamak

   
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.

  

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