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Prevention of mode coupling by external applied resonant magnetic perturbation on the J-TEXT tokamak

Ying He, Nengchao Wang, Da Li, Yonghua Ding, Song Zhou, Feiyue Mao, Zhengkang Ren, Xianqian Zha, Chuanxu Zhao, Yangbo Li2023年Plasma Physics and Controlled FusionIF 2.2出版社

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.

日本語訳

トロイダル結合モード数m/n = 2/1と3/1のモード間の結合は、J-TEXTにおいて頻繁に発生する。ここで、m(n)はポロイダル(トロイダル)モード数である。これらの結合モードは互いに不安定化を引き起こし、閉じ込めの劣化や、さらには大規模なディスラプションに至ることもある。本論文では、適切な静的共鳴磁場摂動(RMP)の印加によるモード結合を防止するための2つの制御戦略を提示する。実験結果は、適度な2/1 RMPが小さな回転する2/1モードを抑制し、それによって2/1モードと3/1モード間の結合を防止できることを実証している。3/1静的RMPは、小さな2/1モードを8 kHzで回転させたまま、大きな3/1ロックドアイランドを励起することができる。2/1モードと3/1モード間の周波数差を拡大することで、モード結合はより困難になる。両方の戦略は、2/1モードと3/1モード間の周波数結合条件を破壊することができ、それによって結合と相互不安定化を回避できる。

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Magnetic perturbationResonant magnetic perturbationTEXTJ-TEXTMode coupling
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