原子能科学技术2024，Vol.58Issue(1)：14-22,9.DOI:10.7538/yzk.2023.youxian.0284
FAR3d程序对EAST上阿尔芬不稳定性识别过程中的应用
Application of FAR3d in Alfven Instability Identification on EAST
摘要
Abstract
This paper aims to comprehensively analyze the Alfven instability observed in the high βN discharge of EAST,considering both experimental observations and simula-tion studies.There are two purposes of this paper,the first one is to observe the AE activity in EAST,the second one is to apply and validate the FAR3d code in EAST.In the experimental analysis,the presence of a strong instability is detected using magnetic probes and electron cyclotron emission diagnostics.Two kinds of modes are observed:one's frequency ranging from approximately 70 kHz to 100 kHz,exhibiting an upward frequency sweep,and another frequency at around 60 kHz.These instabilities are found to destabilized near ρ=0.46 with a toroidal mode number of 2 calculated by toroidal Mirnov probe array.Complementing the experimental findings,simulations were per-formed using the eigensolver method of the FAR3d code.This is the first time that FAR3d code was applied on EAST,so the model needed to be validated by reproducing the AE activity.The simulation results successfully identify the dominant mode,toroid-al Alfven eigenmode(TAE),occurring at ρ=0.45 with a frequency of 87 kHz,toroidal and poloidal number n/m=2/3,2/4.Additionally,a sub-dominant mode,energetic particle mode(EPM),is identified at ρ=0.55 with a frequency of 62 kHz,n/m=2/4.The agreement between the simulation and experimental results confirms the accuracy of the simulation model in characterizing the instability types,as well as providing consist-ent location and frequency information.Furthermore,the FAR3d code is employed to evaluate the influence of the finite Larmor radius(FLR)effect.The simulation results demonstrate that the FLR effect has minimal impact on identifying low toroidal mode number(n)instability modes in the high βN discharge of EAST.Consequently,the FLR effect can be neglected during the mode identification process,allowing for accelerated calculations.While,in the simulation of high toroidal mode number,the FLR effects should be considered.In conclusion,this study presents a comprehensive analysis of the Alfven instability in the high βN discharge of EAST.By combining experimental obser-vations with simulation results,the types of instabilities,their locations,and frequen-cies are successfully identified and found to be in good agreement.Additionally,the study confirms that the FLR effect has little influence on identifying low n instability modes,enabling faster calculations by excluding FLR effects during mode identification.These findings contribute to a better understanding of the Alfven instability in high βN discharges and provide valuable insights for future research in fusion plasma physics.关键词
FAR3d/阿尔芬本征模/EAST/快离子Key words
FAR3d/Alfven eigenmode/EAST/fast ion分类
能源科技引用本文复制引用
王曦辉,黄娟,赵海林,J.Varela,付静,孙延旭,史唱,王书松..FAR3d程序对EAST上阿尔芬不稳定性识别过程中的应用[J].原子能科学技术,2024,58(1):14-22,9.基金项目
国家磁约束聚变能源研究专项(2019YFE03020004) （2019YFE03020004）
国家自然科学基金(11975276) （11975276）
安徽省重点研发计划(202104b11020003) （202104b11020003）
中国科学院合肥大科学中心高端用户培育基金(2021HSC-UE015) （2021HSC-UE015）
