首页|Numerical study of plasmas start-up by electron cyclotron waves in NCST spheri-cal tokamak and CN-H1 stellarator
Numerical study of plasmas start-up by electron cyclotron waves in NCST spheri-cal tokamak and CN-H1 stellarator
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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 Bv on EC wave assisted start-up,the relationship between EC wave injection power Pinj,Ohmic electric field E,and initial hydrogen atom density nH0 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 of 28 GHz EC wave start-up in the CN-H1 stellarator plasma,the plasma current in the zero-dimensional model is replaced with the current in the poloidal coil of the stellarator.Plasma start-up can be successfully achieved at injection powers in the hundreds of kilowatts range,resulting in electron densities on the order of 1017-1018 m-3.
spherical torusstellaratorelectron cyclotron wavestart-up0D model
刘亿卓行、郑平卫、龚学余、尹岚、陈小昌、钟翊君、杨文军
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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 Physics and Materials,Nanchang University,Nanchang 330031,People's Republic of China
School of Electrical Engineering,University of South China,Hengyang 421001,People's Republic of China
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National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China
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