Reduction of sawtooth amplitude by resonant magnetic perturbation. (22nd September 2020)

• Record Type: Journal Article
• Authors: Li, Jianchao; Ding, Yonghua; Yu, Qingquan; Wang, Nengchao; Li, Da; Zhang, Xiaoqing; Han, Dongliang; Chen, Zhipeng; Yang, Zhoujun; Zhou, Song; Yan, Wei; Liang, Yunfeng; Zhang, Xiaolong; Lin, Xiaodong; Sun, Huibin; Gao, Xiang; Li, Jiangang
• Other Names: collab.
• Is Part Of: Nuclear fusion. Volume 60:Number 12(2020)
• Publication Date: 2020-09-22
• Subjects: sawtooth -- resonant magnetic perturbation -- 2/2 island -- tokamak plasma; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/1741-4326/abae47
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: Sawtooth crashes of large amplitude are detrimental to tokamak plasma confinement, and the amplitude has to be reduced for a fusion reactor. A novel method, i.e. applying m / n = 2/2 resonant magnetic perturbations (RMPs), is found to be able to reduce the sawtooth magnitude in J-TEXT tokamak experiments. The penetration of RMPs and formation of 2/2 locked island are found to be related to the reduction of sawtooth magnitude. With the available 2/2 RMP field, the sawtooth mitigation is reproducibly achieved with q a < 2.8 and n e < 2 × 10 19 m −3 in J-TEXT.