Dynamics of spherical tokamak plasma on the internal reconnection event | Zendy

N. Mizuguchi | Zendy; Takaya Hayashi | Zendy; Tetsuya Sato | Zendy

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Dynamics of spherical tokamak plasma on the internal reconnection event

Author(s) -

N. Mizuguchi,

Takaya Hayashi,

Tetsuya Sato

Publication year - 2000

Publication title -

physics of plasmas

Language(s) - English

Resource type - Journals

eISSN - 1089-7674

pISSN - 1070-664X

DOI - 10.1063/1.873892

Subject(s) - physics , magnetohydrodynamic drive , magnetic reconnection , magnetohydrodynamics , plasma , tokamak , instability , mechanics , nonlinear system , magnetic field , relaxation (psychology) , kink instability , classical mechanics , nuclear physics , psychology , social psychology , quantum mechanics

Nonlinear magnetohydrodynamic (MHD) simulations are executed to investigate the dynamical behavior of the relaxation phenomenon observed in spherical tokamak (ST) plasma that is known as the Internal Reconnection Event (IRE). The simulation results successfully reproduce several key features of IRE, and the physical mechanisms are revealed. A sudden collapse of the pressure profile takes place as a result of a nonlinear time development of a pressure-driven instability. A magnetic reconnection induced between the internal and the external magnetic field is found to play a crucial role in determining the nature of the overall process, namely, the rapid expulsion of the plasma heat energy due to the pressure imbalance along the reconnected field lines, and the large distortion in the overall shape. The resultant deformations in overall shape of the plasma are in good agreement with the experimental observations

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