Numerical study of plasmas start-up by electron cyclotron waves in NCST spherical tokamak and CN-H1 stellarator  

作　　者：刘亿卓行 郑平卫 龚学余 尹岚 陈小昌 钟翊君 杨文军 Yizhuohang LIU;Pingwei ZHENG;Xueyu GONG;Lan YIN;Xiaochang CHEN;Yijun ZHONG;Wenjun YANG(School of Nuclear Science and Technology,University of South China,Hengyang 421001,People’s Republic of China;School of Resource,Environment,and Safety Engineering,University of South China,Hengyang 421001,People’s Republic of China;School of Electrical Engineering,University of South China,Hengyang 421001,People’s Republic of China;School of Physics and Materials,Nanchang University,Nanchang 330031,People’s Republic of China)

机构地区：[1]School of Nuclear Science and Technology,University of South China,Hengyang 421001,People’s Republic of China [2]School of Resource,Environment,and Safety Engineering,University of South China,Hengyang 421001,People’s Republic of China [3]School of Electrical Engineering,University of South China,Hengyang 421001,People’s Republic of China [4]School of Physics and Materials,Nanchang University,Nanchang 330031,People’s Republic of China

出　　处：《Plasma Science and Technology》2024年第7期12-22,共11页等离子体科学和技术（英文版）

基　　金：supported by the National Key Research and Development Program of China(Nos.2022YFE03070000 and 2022YFE03070003);National Natural Science Foundation of China(Nos.12375220 and 12075114)。

摘　　要：According to the physics of tokamak start-up,this study constructs a zero-dimensional(0D)model applicable to electron cyclotron(EC)wave assisted start-up in NCST spherical torus(spherical tokamak)and CN-H1 stellarators.Using the constructed 0D model,the results obtained in this study under the same conditions are compared and validated against reference results for pure hydrogen plasma start-up in tokamak.The results are in good agreement,especially regarding electron temperature,ion temperature and plasma current.In the presence of finite Ohmic electric field in the spherical tokamak,a study on the EC wave assisted start-up of the NCST plasma at frequency of 28 GHz is conducted.The impact of the vertical magnetic field B_(v)on EC wave assisted start-up,the relationship between EC wave injection power P_(inj),Ohmic electric field E,and initial hydrogen atom density n_(H0)are explored separately.It is found that under conditions of Ohmic electric field lower than ITER(~0.3 V m^(-1)),EC wave can expand the operational space to achieve better plasma parameters.Simulating the process of28 GHz EC wave start-up in the CN-H1 stellarator plasma,the plasma current in the zerodimensional model is replaced with the current in the poloidal coil of the stellarator.Plasma startup can be successfully achieved at injection powers in the hundreds of kilowatts range,resulting in electron densities on the order of 10^(17)-10^(18)m^(-3).

关 键 词：spherical torus STELLARATOR electron cyclotron wave START-UP 0D model 

分 类 号：TL6[核科学技术—核技术及应用]