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Aiba, Nobuyuki; Tokuda, Shinji; Furukawa, Masaru*; Hirota, Makoto; Oyama, Naoyuki
no journal, ,
Effects of a toroidal rotation are investigated numerically on the stability of the MHD modes in the edge pedestal, which relate to the type-I edge-localized mode (ELM). A new linear MHD stability code MINERVA is developed for solving the Frieman-Rotenberg equation, which is the linear ideal MHD equation with flow. As the result of the stability analysis, it is revealed that the sheared toroidal rotation destabilizes the edge localized MHD modes. The change of the safety factor profile affects this destabilizing effect. This is because the rotation effect on the edge MHD stability becomes stronger as the toroidal mode number of the unstable MHD mode increases, and this toroidal mode number strongly depends on the safety factor profile.
Shiraishi, Junya; Tokuda, Shinji; Aiba, Nobuyuki
no journal, ,
no abstracts in English
Hirota, Makoto
no journal, ,
Small-amplitude linear waves are generally able to induce mean fields and to modify pre-existing ones by wave-wave interaction. Such wave-driven mean fields are often important since they have to do with transport and secondary instabilities. The Lagrangian approach to fluids and plasmas is shown to be advantageous to the perturbation analysis in some aspects.
Idomura, Yasuhiro
no journal, ,
no abstracts in English
Lesur, M.*; Idomura, Yasuhiro; Garbet, X.*
no journal, ,
no abstracts in English
Jolliet, S.*; Villard, L.*; Idomura, Yasuhiro; McMillan, B. F.*; Bottino, A.*; Lapillonne, X.*
no journal, ,
no abstracts in English