文献类型：期刊文献

英文题名：Linear gyrokinetic simulation of fast-ion effects on the transition of the dominant electrostatic instability from TEM to ITG in EAST

作者：Feng, Jinghong[1];Zhang, Debing[1];Zhang, Xianmei[1];Yu, Limin[1];Tang, Ruzhi[1];Huang, Juan[2];Xiao, Yong[3]

机构：[1]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China;[3]Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310027, Peoples R China

年份：2026

卷号：28

期号：6

外文期刊名：PLASMA SCIENCE & TECHNOLOGY

收录：;EI(收录号：20262520945508);WOS:【SCI-EXPANDED(收录号:WOS:001795020900001)】；

基金：This work was supported by National Natural Science Foundation of China (No. 12375215), the National MCF Energy R&D Program of China (No. 2019YFE03060000).

语种：英文

外文关键词：gyrokinetic simulation; fast ions; collision effects; microinstabilities

摘要：Linear gyrokinetic simulations have been performed using the gyrokinetic toroidal code (GTC) code to investigate the effects of fast ions on the dominant instability changes from trapped electron mode (TEM) to ion temperature gradient (ITG) in the EAST. The effects of fractions (5%, 7.5% and 10%) and temperatures (10 keV, 20 keV and 30 keV) of fast ions are investigated. The dominant mode transitions from TEM to ITG mode under different plasma parameters. A transition of the dominant instability is observed at and shifts to when fast ions are considered. In addition, fast ions stabilize ITG modes, and the effect becomes more significant as the fraction of fast ions increases, reducing the growth rate by approximately 10% when the fraction of fast ions is 10%. The stabilizing effect increases with increasing temperature of fast ions, but varies little for . Fast ions reduce the ion temperature gradient threshold of the dominant instability changes from TEM to ITG. The threshold decreases with decreasing temperature of fast ions, with a reduction of about when the fraction reaches in hydrogen plasmas, and about when deuterium is the main ion. Furthermore, the normalized electron temperature gradient for the dominant instability changes from ITG to TEM is lower in hydrogen plasmas, decreasing from 5.4 to 4.1 as increases from 10 keV to 30 keV, while in deuterium plasmas it decreases from 10.5 to 9.5. Moreover, electron-electron collisions lead to the dominant instability changes from TEM to ITG at and strongly stabilize the ITG mode, reducing its growth rate about , while ion-ion collisions have little influence on TEM and ITG.