The formulation of a method for the systematic computation of the growth rate of the weakly unstable resistive wall mode (RWM) in 3D configurations by using results from ideal stability codes is presented. It is shown that the growth rate of the RWM is given, approximately, by the rate at which the available free energy for the ideal external kink mode can be dissipated by the resistive wall. The eigenfunction is also approximated by that of the external kink mode. This formulation is demonstrated by coupling to the ideal MHD code KSTEP with computation of the dissipation on the resistive wall. Results of the stability of the RWM in LHD plasmas and discussion of the validity and improvement of the computation are also included.
摘要：提出了一种利用理想磁流体力学代码计算结果，系统计算三维位形下弱不稳定电阻壁模（RWM）增长率的方法。结果表明，电阻壁模的增长率近似等于理想外扭曲模自由能通过电阻壁耗散的速率。其特征函数也近似于理想外扭曲模的特征函数。该方法通过与理想MHD代码KSTEP耦合，并计算电阻壁上的耗散来实现。文中还给出了大型螺旋装置（LHD）等离子体中电阻壁模稳定性的计算结果，并讨论了该计算方法的有效性与改进方向。