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Impact of plasma rotation on the linear physics of resistive wall modes in tokamaks

机译：等离子体旋转对托卡马克电阻壁模式线性物理的影响

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Rotation effects on the linear stability of the resistive wall mode (RWM) are investigated numerically based on the ideal magnetohydrodynamics (MHD) model. One topic is impact of poloidal rotation in a toroidally rotating plasma. Since the difference between mode frequency and rotation frequency is important to change the MHD stability by rotation, modulation of the Doppler-shifted frequency by poloidal rotation can play an important role even when the poloidal rotation velocity is significantly lower than the toroidal one. In addition, when poloidal rotation is fixed, the absolute value of the Doppler-shifted frequency relies on the direction of toroidal rotation, and hence, linear MHD stability can depend on this rotation direction. Such a dependence is sometimes observed experimentally. The other topic is the re-destabilization of the RWM by toroidal rotation in a reversed shear tokamak. Several numerical results imply that a candidate of this re-destabilized mode is a stable MHD eigenmode, which becomes unstable due to coupling with the RWM when rotation frequency is similar to the frequency of this stable eigenmode in a static equilibrium.
机译：基于理想磁流体动力学（MHD）模型，数值研究了旋转对电阻壁模式（RWM）线性稳定性的影响。一个话题是在环形旋转等离子体中极向旋转的影响。由于模式频率和旋转频率之间的差异对于通过旋转改变MHD稳定性很重要，因此即使当极向旋转速度明显低于环形旋转速度时，通过极向旋转对多普勒频移的调制也可以发挥重要作用。另外，当极向旋转固定时，多普勒频移的频率的绝对值取决于环形旋转的方向，因此线性MHD稳定性可以取决于该旋转方向。有时可以通过实验观察到这种依赖性。另一个主题是在逆向剪切托卡马克中通过环形旋转重新RWWM。几个数值结果表明，这种重新去稳定模式的候选者是稳定的MHD本征模式，当旋转频率类似于静态平衡下该稳定本征模式的频率时，由于与RWM耦合而变得不稳定。

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