Density limits investigation and high density operation in EAST tokamak

doi:10.1088/0741-3335/58/5/055013

CORC > 合肥物质科学研究院 > 中国科学院合肥物质科学研究院 > 中科院等离子体物理研究所

	Density limits investigation and high density operation in EAST tokamak
	Zheng, Xingwei1,2 ; Li, Jiangang 1,2; Hu, Jiansheng2 ; Liu, Haiqing 2; Jie, Yinxian 2; Wang, Shouxin 2; Li, Jiahong 2; Duan, Yanming 2; Li, Miaohui 2; Li, Yongchun2
刊名	PLASMA PHYSICS AND CONTROLLED FUSION
	2016-05-01
卷号	58 期号:5 页码:055013
关键词	Density Limit H-mode Density Limit Tokamak Nbi Lhcd East
DOI	10.1088/0741-3335/58/5/055013
文献子类	Article
英文摘要	Increasing the density in a tokamak is limited by the so-called density limit, which is generally performed as an appearance of disruption causing loss of plasma confinement, or a degradation of high confinement mode which could further lead to a H -> L transition. The L-mode and H-mode density limit has been investigated in EAST tokamak. Experimental results suggest that density limits could be triggered by either edge cooling or excessive central radiation. The L-mode density limit disruption is generally triggered by edge cooling, which leads to the current profile shrinkage and then destabilizes a 2/1 tearing mode, ultimately resulting in a disruption. The L-mode density limit scaling agrees well with the Greenwald limit in EAST. The observed H-mode density limit in EAST is an operational-space limit with a value of 0.8 similar to 0.9n(GW). High density H-mode heated by neutral beam injection (NBI) and lower hybrid current drive (LHCD) are analyzed, respectively. The constancy of the edge density gradients in H-mode indicates a critical limit caused perhaps by e.g. ballooning induced transport. The maximum density is accessed at the H -> L transition which is generally caused by the excessive core radiation due to high Z impurities (Fe, Cu). Operating at a high density (>2.8 x 10(19) m(-3)) is favorable for suppressing the beam shine through NBI. High density H-mode up to 5.3 x 10(19) m(-3) (similar to 0.8n(GW)) could be sustained by 2 MW 4.6 GHz LHCD alone, and its current drive efficiency is studied. Statistics show that good control of impurities and recycling facilitate high density operation. With careful control of these factors, high density up to 0.93n(GW) stable H-mode operation was carried out heated by 1.7 MW LHCD and 1.9 MW ion cyclotron resonance heating with supersonic molecular beam injection fueling.
WOS关键词	DIII-D ; SUPERCONDUCTING TOKAMAK ; PLASMA PERFORMANCE ; MODE ; JET ; DISRUPTIONS ; DIVERTOR ; UPGRADE ; ASDEX
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000375232300021
资助机构	National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; National Magnetic Confinement Fusion Science Program(2013GB114004 ; 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National Nature Science Foundation of China(11075185 ; National Nature Science Foundation of China(11075185 ; National Nature Science Foundation of China(11075185 ; National Nature Science Foundation of China(11075185 ; National Nature Science Foundation of China(11075185 ; National Nature Science Foundation of China(11075185 ; National Nature Science Foundation of China(11075185 ; National Nature Science Foundation of China(11075185 ; National Nature Science Foundation of China(11075185 ; National Nature Science Foundation of China(11075185 ; National Nature Science Foundation of China(11075185 ; National Nature Science Foundation of China(11075185 ; National Nature Science Foundation of China(11075185 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 2014GB106005 ; 11021565 ; 11021565 ; 11021565 ; 11021565 ; 11021565 ; 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内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/21712]
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.USTC, Sch Nucl Sci & Technol, Hefei 230027, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Xingwei,Li, Jiangang,Hu, Jiansheng,et al. Density limits investigation and high density operation in EAST tokamak[J]. PLASMA PHYSICS AND CONTROLLED FUSION,2016,58(5):055013.
APA	Zheng, Xingwei.,Li, Jiangang.,Hu, Jiansheng.,Liu, Haiqing.,Jie, Yinxian.,...&EAST Team.(2016).Density limits investigation and high density operation in EAST tokamak.PLASMA PHYSICS AND CONTROLLED FUSION,58(5),055013.
MLA	Zheng, Xingwei,et al."Density limits investigation and high density operation in EAST tokamak".PLASMA PHYSICS AND CONTROLLED FUSION 58.5(2016):055013.