Magnetohydrodynamic effect of internal transport barrier on EAST tokamak

• 作者: Yuqi CHU Haiqing LIU Shoubiao ZHANG Liqing XU Erzhong LI Yinxian JIE Hui LIAN Tianfu ZHOU Xi FENG Xuexi ZHANG Yunfei WANG Xiang ZHU Chenbin WU Shouxin WANG Yao YANG K HANADA Bo LYU Yingying LI Qing ZANG EAST Team
• 来源期刊: 等离子体科学和技术（英文版）
• 年，卷（期）: 2022,（3）
• 所属期刊栏目: MAGNETICALLY CONFINED PLASMA
• 页码范围: 71-79
• 页数: 9页
• 语种: 英文

摘要

An internal transport barrier(ITB)can be formed on EAST in exploring high-parameter operation.Previous studies show that safety factor(q)profiles,Shafranov shift and magnetohydrodynamic behaviors could be helpful in ITB formation by suppressing anomalous transport.Recently,electron density evolution with high resolution demonstrates that fishbone could be dominant in electron density ITB formation and sustainment.The power threshold is low in the fishbone condition and the electron density profile is determined by traits of fishbone.Simulation shows that the low-k ion mode is suppressed by fishbone.Direct measurement of turbulence in the inner region shows that the internal kink mode could sustain an electron temperature ITB by suppressing the trapped electron mode.The multi-scale interaction between the kink mode and turbulence by current could be key in sustaining high-electron-temperature long-pulse operation.