NIFS-812

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Author(s): M.S. Chu, K. Ichiguchi Title: Effect of the Resisteive Wall on the Growth Rate of Weakly Unstable External Kink Mode in General 3D Configurations Date of publication: May 2005 Key words: Resistive Wall Mode, 3D MHD Stability, Formulation and Application to LHD Abstract: Formulation of a method for the systematic computation of the growth rate of the weakly unstable RWM in 3D configurations by using results from ideal stability codes is presented. It is shown that the growth rate of the RWM is approximately given 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 on the validity and improvement to the computation are also included.

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