Key issues for long-pulse high- β N operation with the Experimental Advanced Superconducting Tokamak (EAST)

Nuclear Fushion

article

Xiang Gao¹  Yao Yang¹  Tao Zhang¹  Haiqing Liu¹  Guoqiang Li¹  Tingfeng Ming¹  Zixi Liu¹  Yumin Wang¹  Long Zeng¹  Xiang Han¹  Yukai Liu¹  Muquan Wu¹  Hao Qu¹  Biao Shen¹  Qing Zang¹  Yaowei Yu¹  Defeng Kong¹  Wei Gao¹  Ling Zhang¹  Huishan Cai²  Xuemei Wu³  K. Hanada⁴  Fubin Zhong¹  Yunfeng Liang¹  Chundong Hu¹  Fukun Liu¹  Xianzhu Gong¹  Bingjia Xiao¹  Baonian Wan¹  Xiaodong Zhang¹  Jiangang Li¹  the EAST Team¹ 

[1] Institute of Plasma Physics, Chinese Academy of Sciences;Department of Modern Physics, University of Science and Technology of China;College of Physics, Soochow University;Research Institute for Applied Mechanics, Kyushu University

关键词: H mode;    high normalized beta;    long pulse;   

DOI  :  10.1088/1741-4326/aa626c

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

In the last few years, long-pulse H-mode plasma discharges (with small edge-localized modes and normalized beta,β _N ~ 1) have been realized at theExperimental Advanced Superconducting Tokamak(EAST). This paper reports on high- β _N (>1.5) discharges in the 2015 EAST campaign. The characteristics of these H-mode plasmas have been presented in a database. Analysis of the experimental limit ofβ _N has revealed several main features of typical discharges. Firstly, efficient, stable high heating power is required. Secondly, control of impurity radiation (partly due to interaction between the plasma and the in-vessel components) is also a critical issue for the maintenance of high- β _N discharges. In addition an internal transport barrier (ITB) has recently been observed in EAST, introducing further improvement in confinement surpassing H-mode plasmas. ITB dynamics is another key issue for high- β _N plasmas in EAST. Each of these features is discussed in this paper. Study and improvement of these issues could be considered as the key to achieving long-pulse high- β _N operation with EAST.

【 授权许可】

Unknown