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,△φ=φtop-φbottom,where φtop and φbottom are the toroidal phases of the n=1 field of each coil row.The type of RMP penetration is found to be related to △φ,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△φ.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.

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;Yunfeng LIANG;Yonghua DING;Yuan PAN;J-TEXT Team

International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics,State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,People's Republic of China;College of Computer Science,South-Central Minzu University,Wuhan 430074,People's Republic of China;Physics Department,Federal University Dutse,Dutse 720101,Jigawa,Nigeria;Forschungszentrum Jülich GmbH,Institut für Energie-und Klimaforschung-Plasmaphysik,Partner of the Trilateral Euregio Cluster(TEC),Jülich 52425,Germany;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People's Republic of China

等离子体科学和技术（英文版）

[1]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;Yunfeng LIANG;Yonghua DING;Yuan PAN;J-TEXT Team-.Study of the spectrum effect on the threshold of resonant magnetic perturbation penetration on J-TEXT)[J].等离子体科学和技术（英文版）,2022(12):11-20

penetrations

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