文献类型：期刊文献

英文题名：Gyrokinetic simulation of electromagnetic instabilities in the high βp scenario on EAST

作者：EAST Team[2];Zheng, S. Y.[1];Zhang, D. B.[1];Yu, L. M.[1];Zhang, X. M.[1];Xue, E. B.[1];Ma, L. J.[1];Tang, R. Z.[1];Huang, J.[2];Xiao, Y.[3];Wu, M. Q.[4];Ye, L.[2];Gong, X. Z.[2]

机构：[1]East China Univ Sci & Technol, Dept 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;[4]Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Peoples R China

年份：2023

卷号：65

期号：7

外文期刊名：PLASMA PHYSICS AND CONTROLLED FUSION

收录：;EI(收录号：20232514265287);WOS:【SCI-EXPANDED(收录号:WOS:001004565700001)】；

基金：This work was supported by the National MCF Energy R&D Program of China under Nos. 2019YFE03060000, 2019YFE03050000 and 2019YFE03020004, National Natural Science Foundation of China (Grant Nos. 11675053, 12005063, and 11875131), Users with Excellence Program of Hefei Science Center CAS, Grant Nos. 2020HSC-UE011 and 2021HSC-UE015, and Anhui Provincial Natural Science Foundation No. 2008085Jo4.

语种：英文

外文关键词：high poloidal beta; gyrokinetic simulation; electromagnetic instability

摘要：High poloidal beta scenarios with favorable plasma performance (beta(p) similar to 2.0,H-98 similar to 1.3) have be achieved on Experimental Advanced Superconducting Tokamak (EAST) since the 2018 international atomic energy agency (IAEA). Linear electromagnetic gyrokinetic simulations using gyrokinetic toroidal code (GTC) code are performed based on the experimental data of a typical high beta(p) discharge on EAST. In the core region of plasma, an electromagnetic instability with similar beta(e) dependence and mode structure with kinetic ballooning mode (KBM) but exhibits positive or nearly zero frequency is observed. This instability is referred as unconventional KBM (UKBM). Simulation results demonstrate that UKBM occurs in low ion-electron temperature ratio conditions and UKBM will transit to KBM when ion-electron temperature is high. Further investigation shows the driven mechanism of UKBM differs at different electron beta region. When the electron beta exceeds the threshold of electrostatic instability to UKBM, UKBM is driven by electron pressure gradient. When electron beta is close to the beta threshold of UKBM, the main driven mechanism is eta(e). Reversed magnetic shear is found to have a significant stabilize effect on UKBM.