Abstract
The physical mechanism of energy loss on a relaxation process in spherical tokamak has been revealed by means of a nonlinear magnetohydrodynamic simulation. A new type of energy loss, in which interaction between the core and the edge plays an important role, is found. A magnetic reconnection is induced between the internal and the external magnetic field as a result of the nonlinear development of the instabilities of low m/n modes. The plasma stored inside the separatrix is rapidly lost out of the torus along with a strong plasma flow induced by the pressure imbalance along the reconnected field lines.
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