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Numerical method for the stability analysis of ideal MHD modes with a wide range of toroidal mode numbers in tokamaks

Aiba, Nobuyuki; Tokuda, Shinji; Fujita, Takaaki; Ozeki, Takahisa; Chu, M. S.*; Snyder, P. B.*; Wilson, H. R.*

Numerical method for the stability analysis of ideal MHD modes is invented by using the physical model based on the two-dimensional Newcomb equation in combination with the conventional ideal MHD model. The MARG2D code built on this numerical method realizes to analyze the stability of wide $$n$$ range of ideal MHD modes. The validity of MARG2D has been confirmed with the benchmarking test with the DCON code by identifying the stability boundary of low-$$n$$ modes, and that with the ELITE code by comparing the growth rates of intermediate to high $$n$$ modes. With the MARG2D code, the edge stability of JT-60SA, the complementally experiment of ITER, is investigated.

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