Low-n global ideal MHD instabilities in CFETR baseline scenario,Plasma Physics and Controlled Fusion

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Low-n global ideal MHD instabilities in CFETR baseline scenario
Plasma Physics and Controlled Fusion ( IF 2.1 ) Pub Date : 2020-07-14 , DOI: 10.1088/1361-6587/ab97f0
Rui HAN ₁ , Ping ZHU _{2,

3} , Debabrata BANERJEE ₁ , Shikui CHENG ₁ , Xingting YAN ₁ , Linjin ZHENG ₄

Affiliation

This article reports an evaluation on the linear ideal magnetohydrodynamic (MHD) stability of the China Fusion Engineering Test Reactor (CFETR) baseline scenario for various first-wall locations. The initial-value code NIMROD and eigen-value code AEGIS are employed in this analysis. A good agreement is achieved between two codes in the growth rates of $n=1-10$ ideal MHD modes for various locations of the perfect conducting first-wall. The higher-$n$ modes are dominated by ballooning modes and localized in the pedestal region, while the lower-$n$ modes have more prominent external kink components and broader mode profiles. The influences of plasma-vacuum profile and wall shape are also examined using NIMROD. In presence of resistive wall, the low-$n$ ideal MHD instabilities are further studied using AEGIS. For the designed first-wall location, the $n = 1$ resistive wall mode (RWM) is found unstable, which could be fully stabilized by uniform toroidal rotation above 2.9\% core Alfven speed.

更新日期：2020-07-14

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