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Oral presentation

Extension of kinetic-magnetohydrodynamic model to include toroidal rotation shear effect and its application to stability analysis of resistive wall modes

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.

Oral presentation

Simulations of locked mode and rotation drive in a tokamak

Kurita, Genichi; Isayama, Akihiko; Matsunaga, Go; Takechi, Manabu; Ide, Shunsuke

no journal, , 

no abstracts in English

Oral presentation

Destabilization of resistive wall mode in rotating tokamak plasmas

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.

Oral presentation

Analysis of current quench induced by the massive neon gas-puff in JT-60U using DINA code

Shibata, Yoshihide; Isayama, Akihiko; Matsunaga, Go; Kawano, Yasunori; Miyamoto, Seiji*; Lukash, V. E.*; Khayrutdinov, R.*

no journal, , 

no abstracts in English

Oral presentation

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