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Author(s):
H. Miura, T. Hayashi and T. Sato
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Title:
Nonlinear Simulation of Resistive Ballooning Modes in Large Helical Device
Date of publication:
June 2001
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Key words:
nonlinear simulation, MHD, resistive ballooning mode
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Abstract:
Nonlinear simulations of a magneto-hydrodynamic (MHD) plasma in full three-dimensional geometry of the Large Helical Device (LHD) are conducted to study nonlinear evolution of pressure-driven instabilities. A series of simulations for a resistive plasma shows growth of resistive ballooning instability. The growth rate of the most unstable resistive ballooning mode is shown to be proportional to the one-third power of the resistivity. Nonlinear saturation of the instability and its slow decay are observed. After the nonlinear saturation, the pressure takes a profile similar to so-called pedestal . A possible scenario of nonlinear relaxation of a plasma toward a new equilibrated state is discussed.
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