Experimental study of the core instability before and after internal transport barrier formation in EAST

Nuclear Fushion

article

Mingfu Wu¹  Zixi Liu¹  Gongshun Li²  Xiang Han²  Tao Zhang²  Yingying Li³  Tianfu Zhou²  Yan Chao²  Shouxin Wang²  Xiaohe Wu¹  Kangning Geng²  Haoming Xiang⁵  Fubin Zhong⁵  Kaixuan Ye²  Jia Huang¹  Zhen Zhou⁷  Shuqi Yang¹  Fei Wen²  Yumin Wang³  Shoubiao Zhang²  Ge Zhuang¹  Xiang Gao¹ 

[1] University of Science and Technology of China;Institute of Plasma Physics, Chinese Academy of Science;Hebei Key Laboratory of Compact Fusion;ENN Science and Technology Development Co., Ltd.;Advanced Energy Research Center, Shenzhen University;Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University;Department of Physics, Nanchang University;Jiangxi Province Key Laboratory of Fusion and Information Control, Nanchang University

关键词: turbulence;    ITB;    reverse shear;    qmin;    EAST;   

DOI  :  10.1088/1741-4326/aca10b

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

In a reversed shear discharge in the Experimental Advanced Superconducting Tokamak (EAST), an internal transport barrier (ITB) was formed. For the first time, the turbulence in the plasma core before and after the formation of the ITB in EAST was investigated by microwave reflectometry. It was found that during the formation of the ITB, the turbulence inside the barrier was not completely suppressed. The density fluctuation level decreased in the early phase of ITB and significantly increased later. It was found that the density fluctuation level increased with the density gradient after the appearance of reversed shear Alfvén eigenmodes (RSAEs). The change in turbulence, measurable by the reflectometer, did not affect the rate of increase in core density. Through the measurement of RSAEs, it was found that the formation of this ITB may be related to the minimumq( q _min).q _min was close to 2.

【 授权许可】

Unknown