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Density limits investigation and high density operation in EAST tokamak

文献类型：期刊论文

作者Zheng, Xingwei1,2; Li, Jiangang1,2; Hu, Jiansheng2; Liu, Haiqing2; Jie, Yinxian2; Wang, Shouxin2; Li, Jiahong2; Duan, Yanming2; Li, Miaohui2; Li, Yongchun2
刊名PLASMA PHYSICS AND CONTROLLED FUSION
出版日期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
DOI10.1088/0741-3335/58/5/055013
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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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.

入库方式： OAI收割

来源：合肥物质科学研究院

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