The behavior of runaway current in massive gas injection fast shutdown plasmas in J-TEXT

doi:10.1088/0029-5515/56/11/112013

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	The behavior of runaway current in massive gas injection fast shutdown plasmas in J-TEXT
	Chen, Z. Y.1; Huang, D. W.1; Luo, Y. H.1; Tang, Y.1; Dong, Y. B.2; Zeng, L.3; Tong, R. H.1; Wang, S. Y.1; Wei, Y. N.1; Wang, X. H.1
刊名	NUCLEAR FUSION
	2016-11-01
卷号	56 期号:11 页码:112013
关键词	Runaway Electron Disruption Massive Gas Injection
DOI	10.1088/0029-5515/56/11/112013
文献子类	Article
英文摘要	Runaway currents following disruptions have an important effect on the first wall in current tokamaks and will be more severe in next generation tokamaks. The behavior of runaway currents in massive gas injection (MGI) induced disruptions have been investigated in the J-TEXT tokamak. The cold front induced by the gas jet penetrates helically along field lines, preferentially toward the high field side and stops at a location near the q = 2 surface before the disruption. When the cold front reaches the q = 2 surface it initiates magnetohydrodynamic activities and results in disruption. It is found that the MGI of He or Ne results in runaway free shutdown in a large range of gas injections. Mixture injection of He and Ar (90% He and 10% Ar) consistently results in runaway free shutdown. A moderate amount of Ar injection could produce significant runaway current. The maximum runaway energy in the runaway plateau is estimated using a simplified model which neglects the drag forces and other energy loss mechanisms. The maximum runaway energy increases with decreasing runaway current. Imaging of the runaway beam using a soft x-ray array during the runaway current plateau indicates that the runaway beam is located in the center of the plasma. Resonant magnetic perturbation (RMP) is applied to reduce the runaway current successfully during the disruption phase in a small scale tokamak, J-TEXT. When the runaway current builds up, the application of RMP cannot decouple the runaway beam due to the lower sensitivity of the energetic runaway electrons to the magnetic perturbation.
WOS关键词	ELECTRON GENERATION ; DISRUPTION MITIGATION ; MAJOR DISRUPTIONS ; TERMINATION ; TOKAMAK ; LOSSES ; JT-60U
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000391393900013
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/21944]
专题	合肥物质科学研究院_中科院等离子体物理研究所
作者单位	1.Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Sch Elect & Elect Engn, Wuhan 430074, Peoples R China 2.Southwestern Inst Phys, POB 432, Chengdu 610041, Peoples R China 3.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Chen, Z. Y.,Huang, D. W.,Luo, Y. H.,et al. The behavior of runaway current in massive gas injection fast shutdown plasmas in J-TEXT[J]. NUCLEAR FUSION,2016,56(11):112013.
APA	Chen, Z. Y..,Huang, D. W..,Luo, Y. H..,Tang, Y..,Dong, Y. B..,...&J-TEXT Team.(2016).The behavior of runaway current in massive gas injection fast shutdown plasmas in J-TEXT.NUCLEAR FUSION,56(11),112013.
MLA	Chen, Z. Y.,et al."The behavior of runaway current in massive gas injection fast shutdown plasmas in J-TEXT".NUCLEAR FUSION 56.11(2016):112013.