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Kurita, Genichi; Isayama, Akihiko; Matsunaga, Go; Takechi, Manabu; Ide, Shunsuke
no journal, ,
no abstracts in English
Aiba, Nobuyuki; Hirota, Makoto*; Shiraishi, Junya
no journal, ,
This study found numerically that plasma rotation can destabilize a resistive wall mode (RWM) in tokamaks, though RWM is once stabilized by rotation. In comparison with the results in cylindrical plasmas, it is confirmed that the mode coupling between RWM and a stable MHD eigenmode is one of the strong candidates of the trigger of this destabilization. This is because the destabilized RWM is Doppler-shifted, though RWM is never Doppler-shifted but ideal MHD mode is.
Shiraishi, Junya; Miyato, Naoaki; Matsunaga, Go
no journal, ,
Extension of the kinetic-magnetohydrodynamic (MHD) model is presented to include toroidal rotation shear effect for the first time. The sheared rotation is introduced through generalization of guiding center Lagrangian, yielding two additional terms in a quadratic form of mode-particle resonance. These two terms are overlooked in conventional models. The new model is applied to stability analysis of resistive wall modes (RWMs) successfully. Numerical results show that the rotation shear reduces RWM growth rates further, which is consistent with experimental results.
Shibata, Yoshihide; Isayama, Akihiko; Matsunaga, Go; Kawano, Yasunori; Miyamoto, Seiji*; Lukash, V. E.*; Khayrutdinov, R.*
no journal, ,
no abstracts in English
Matsuyama, Akinobu; Yagi, Masatoshi
no journal, ,