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Geodesic acoustic modes in tokamak plasmas with anisotropic distribution and a radial equilibrium electric field

Plasma Science and Technology 2018年第8期20卷 16-21页

作者： Yue MING Deng ZHOU Wenjia WANG Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 People's Republic of China University of Science and Technology of China Hefei 230026 People's Republic of China Center for Magnetic Fusion Theory Chinese Academy of Sciences Hefei 230031 People's Republic of China

The dispersion relation of standard geodesic acoustic modes in tokamak plasmas with anisotropic distribution and a radial equilibrium electric field is derived and analyzed. Both frequencies and damping rates increase with respect to the poloidal Mach number which indicates the strength of the radial electric field. The strength of anisotropy is denoted by the ratio of the parallel temperature（T_‖） to the perpendicular temperature（T_⊥）. It is shown that, when the parallel temperature is lower than the perpendicular temperature, the enhanced anisotropy tends to enlarge the real frequency but reduces the damping rate, and when the parallel temperature is higher than the perpendicular temperature, the effect is opposite. The radial equilibrium electric field has stronger effect on the frequency and damping rate for the case with higher parallel temperature than the case with higher perpendicular temperature.

关键词： geodesic acoustic mode anisotropy equilibrium flow

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引用

Theoretical & Applied Mechanics Letters 2022年第3期12卷 213-219页

作者： Peng Zhang Yanchong Duan Qiang Zhong Danxun Li Shengfa Yang Jiang Hu Wenjie Li National Engineering Research Center for Inland Waterway Regulation Chongqing Jiaotong UniversityChongqing 400074China State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084China College of Water Resources&Civil Engineering China Agricultural UniversityBeijing 100083China Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System in China Agricultural University Beijing 100083China Key Laboratory of Ministry of Education for Hydraulic and Water Transport Engineering Chongqing Jiaotong UniversityChongqing 400074China

Decelerating open-channel flow is a type of flow that gradually moves forward with decreasing velocity and increasing water *** all flow parameters change along the streamwise direction,previous studies have revealed that these parameters’vertical distributions at different sections can be universally described with a single profile when being nondimensionalised by appropriate *** study focuses on the population trends of spanwise rotational motions at various sections along the main flow direction by particle imaging velocimetry(PIV)*** wall-normal population distributions of density,radius,swirling strength,and convection velocity of the prograde and retrograde motions show similar trends in uniform open-channel *** dimensionless representation is invariant along the main flow *** study’s results indicate the self-similar characteristic of population trends of spanwise rotational motions prevails in decelerating open-channel flow.

关键词： Self-similarity Population trends Spanwise rotational motions Decelerating open-channel flow equilibrium flow

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