常用链接
Prevention of mode coupling by external applied resonant magnetic perturbation on the J-TEXT tokamak
第一作者：Ying He
通讯作者：Nengchao Wang,Da Li
发表刊物：Plasma Phys. Control. Fusion
卷号：65
期号：6
页面范围：065011
DOI码：10.1088/1361-6587/acd20f
发表时间：2023-05-11
摘要：Toroidal coupling between m/n = 2/1 and m/n = 3/1 modes frequently occurs in the J-TEXT, where m (n) is the poloidal (toroidal) mode number. These coupled modes destabilize each other, leading to confinement degradation and even triggering a major disruption. This paper presents two control strategies for preventing the mode coupling through the application of a proper static resonant magnetic perturbation (RMP) field. Experimental results demonstrate that moderate 2/1 RMP can suppress the small, rotating 2/1 mode thus prevent coupling between the 2/1 and 3/1 modes. The 3/1 static RMP can excite a large 3/1 locked island while leave the small 2/1 mode rotating at 8 kHz. Enlarging the frequency difference between 2/1 and 3/1 modes makes mode coupling more difficult. Both strategies can break the frequency coupling condition between the 2/1 and 3/1 modes, and hence avoid coupling and mutual destabilizing.