Study of the spectrum effect on the threshold of resonant magnetic perturbation penetration on J-TEXT

作者：Feiyue Mao, Nengchao Wang, Zhuo Huang, Zhengkang Ren, Song Zhou, Chengshuo Shen, Xiaoyi Zhang, Ying He, Qi Zhang, Ruo Jia, Chuanxu Zhao, Yangbo Li, Bo Hu, Da Li, Abba Alhaji Bala, Zhipeng Chen, Zhongyong Chen, Zhoujun Yang, Y. Liang, Yonghua Ding, Yuan Pan · 发表于：Plasma Science and Technology · 年份：2022 · DOI：10.1088/2058-6272/ac9f2e · 被引用次数：14 · 研究领域：Magnetic confinement fusion research、Ionosphere and magnetosphere dynamics、Superconducting Materials and Applications

Abstract The spectrum effect on the penetration of resonant magnetic perturbation (RMP) is studied with upgraded in-vessel RMP coils on J-TEXT. The poloidal spectrum of the RMP field, especially the amplitudes of 2/1 and 3/1 components, can be varied by the phase difference between the upper and lower coil rows, Δϕ = ϕ top−ϕ bottom, where ϕ top and ϕ bottom are the toroidal phases of the n = 1 field of each coil row. The type of RMP penetration is found to be related to Δϕ, including the RMP penetration of either 2/1 or 3/1 RMP and the successive penetrations of 3/1 RMP followed by the 2/1 RMP. For cases with penetration of only one RMP component, the penetration thresholds measured by the corresponding resonant component are close for various Δϕ. However, the 2/1 RMP penetration threshold is significantly reduced if the 3/1 locked island is formed in advance. The changes in the rotation profile due to 3/1 locked island formation could partially contribute to the reduction of the 2/1 thresholds.