Result of cross-check of peeling-ballooning stability with ELITE/MISHKA and MARG2D on JET-ILW plasma

Aiba, Nobuyuki; Saarelma, S.*; Urano, Hajime; Beurskens, M.*

In JET with ITER-like wall (ILW), edge localized mode sometimes appears even when the pedestal pressure is below the stability boundary determined with numerical analysis, though such a numerical analysis predicted the stability boundary successfully in JET with carbon wall. To identify the reason of this discrepancy in JET ILW plasma, we analyze the pedestal MHD stability whose toroidal mode number, n, is up to 100 with MARG2D code. The numerical results showed that the pedestal stability of JET-ILW plasma is sometimes determined by the stability of n 50 MHD mode, though that of JET with carbon wall was usually determined by the stability of n 30 mode. Such a high-n mode stability remains important even when several non-ideal effects are taken into account in MHD stability analysis.