摘要
本文基于OMFIT(One Modeling Framework for Integrated Tasks)平台,结合中国环流器二号M(HL-2M)托卡马克装置参数,自洽耦合等离子体平衡、外部辅助加热和电流驱动、输运等物理过程,考虑杂质浓度变化引起的等离子体密度、温度等输运量变化,以及引起的等离子体磁面中心Shafranov位移变化,从理论上进行杂质浓度变化对电子回旋波(Electron CyclotronWave,ECW)沉积位置和驱动电流效率的影响研究。研究结果表明,考虑杂质对等离子体的影响时,随着杂质浓度的增加,ECW沉积径向位置先向等离子体芯部移动然后向边缘移动,电流驱动效率先增加后减小。不考虑杂质对等离子体影响时,ECW沉积位置基本不变,电流驱动效率降低。
[Background]In recent years,electron cyclotron wave(ECW)heating and current drive(ECCD)have been widely used in tokamak discharge experiments.The inevitable presence of impurity particles in the tokamak plasma affects the ECCD through radiation energy,inhibition of turbulent transport,and change the collision rate.Changes in plasma density,temperature and other transport quantities caused by the change of impurity concentration,induce the changes of Shafranov displacement at the center of magnetic surface of the plasma.[Purpose]This study aims to investigate the influence of impurity concentration changes on the ECW deposition position and current drive efficiency theoretically with consideration of all above related variations.[Methods]The One Modeling Framework for Integrated Tasks(OMFIT)platform was used to conduct integrated simulation study of the effect of impurity effect on ECW heating and current drive.The HL-2M Tokamak device parameters were combined with self-consistent coupled plasma equilibrium,external auxiliary heating and current drive,transport and other physical processes for simulation computation with the carbon ions as the unique impurity ions.[Results]The simulation results show that when the influence of impurities on the plasma is considered,with the increase of the impurity concentration,the radial position of the ECW deposition first moves to the plasma core and then moves to the edge,and the current drive efficiency first increases and then decreases.Due to the competition between the radiation effect and the dilution effect of the impurity-plasma interaction,the radiation loss power basically increases linearly with the increase of Zeff,while the dilution effect suppresses the turbulence and improve the confinement,but the stabilization effect slows down with the increase of Zeff.[Conclusions]When the influence of impurities on the plasma is not considered,the deposition position of ECW is basically unchanged,and the current drive efficiency decreases.Results of this study have guiding
作者
杨光
钟翊君
龚学余
黄千红
郑平卫
王占辉
YANG Guang;ZHONG Yijun;GONG Xueyu;HUANG Qianhong;ZHENG Pingwei;WANG Zhanhui(Department of Nuclear Science and Technology,University of South China,Hengyang 421001,China;Department of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,China;Institute of Fusion Sciences,Southwestern Institute of Physics,Chengdu 610000,China)
出处
《核技术》
CAS
CSCD
北大核心
2022年第12期18-24,共7页
Nuclear Techniques
基金
国家磁约束核聚变能发展研究专项(No.2018YFE0303102,No.2018YFE0309101)
国家自然科学基金(No.12075114)
湖南省自然科学基金(No.2021JJ50090,No.2021JJ50095,No.2022JJ50157)
湖南省教育厅科学研究一般项目(No.21C0309)资助。
