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Shiraishi, Junya; Tokuda, Shinji*
no journal, ,
no abstracts in English
Aiba, Nobuyuki; Furukawa, Masaru*; Hirota, Makoto; Tokuda, Shinji*
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We investigate numerically the destabilizing effect of a toroidal rotation on the edge localized MHD mode, which induces the large amplitude edge localized mode (ELM). As the results of this analysis, we reveal that the toroidal rotation with shear can destabilize this MHD mode, and the destabilization is caused by the difference between the plasma rotation frequency and the frequency of the unstable mode, which mainly affects the pressure-driven component of the unstable mode. This destabilizing effect becomes more effective as the wave length of the mode becomes shorter, but such a MHD mode with short wave length is also stabilized by the sheared toroidal rotation due to the Doppler-shift at each flux surfaces. We clarify that the stability of the edge localized MHD mode, whose wave length is typically intermediate, is determined by the balance between these stabilizing and destabilizing effects.
Jolliet, S.; Idomura, Yasuhiro
no journal, ,
Idomura, Yasuhiro; Jolliet, S.
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Lesur, M.*; Idomura, Yasuhiro; Shinohara, Koji; Garbet, X.*
no journal, ,
Honda, Mitsuru; Takizuka, Tomonori; Fukuyama, Atsushi*; Yoshida, Maiko; Ozeki, Takahisa
no journal, ,
no abstracts in English
Hirota, Makoto
no journal, ,
Interaction between waves and mean-fields has been traditionally studied by the quasi-linear theory, which copes with various important phenomena such as heating, transport and relaxation of plasmas through the wave activity. Based on the Lagrange-Hamilton framework, we show that the evolution of the mean-fields can be directly estimated by a Lie series expansion in a unified manner. The conservation of free energy among waves and mean-fields is automatically satisfied in this method.