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This article reports an evaluation on the linear ideal magnetohydrodynamic(MHD) stability of the China Fusion Engineering Test Reactor (CFETR) baselinescenario for various first-wall locations. The initial-value code NIMROD andeigen-value code AEGIS are employed in this analysis. A good agreement isachieved between two codes in the growth rates of $n=1-10$ ideal MHD modes forvarious locations of the perfect conducting first-wall. The higher-$n$ modesare dominated by ballooning modes and localized in the pedestal region, whilethe lower-$n$ modes have more prominent external kink components and broadermode profiles. The influences of plasma-vacuum profile and wall shape are alsoexamined using NIMROD. In presence of resistive wall, the low-$n$ ideal MHDinstabilities are further studied using AEGIS. For the designed first-walllocation, the $n = 1$ resistive wall mode (RWM) is found unstable, which couldbe fully stabilized by uniform toroidal rotation above 2.9\% core Alfv\'enspeed.

Low-$n$ global ideal MHD instabilities in CFETR baseline scenario