Abstract:  Based on the scaling laws that the plasma parameters change with the major radius and minor radius for compressed plasma by considering two-step magnetic compression, the vertical magnetic field and related plasma parameters are analyzed during flat-top phase of plasma current. Non-linear dimensionless magnetic field is utilized to analyze the effect of non-inductive current drive, including the effect of bootstrap current. Furthermore, the relationship of vertical magnetic field and line-averaged density is derived and validated during flat-top phase for given plasma current to further study the compressed plasma. Results based on EAST No.41195 discharge show that an increase in magnetic strength of vertical field will allow high T_e, high ne, high β_p and high bootstrap current fraction fBS to be reached, which provide a possibility reference for the high plasma parameters, especially high β_p.

Key words:  EAST, Vertical magnetic field, Compressed plasma

摘要：  基于等离子体参数随大半径/小半径变化的规律，分析了电流平顶段垂直磁场与相关等离子体参数的关系。垂直磁场的非线性部分用于分析非感应电流驱动效应，包括自举电流效应。此外，对于给定的等离子体电流，推导了平顶段垂直磁场与线平均密度之间的关系，并进一步研究压缩后的等离子体。基于EAST第41195次放电的数据分析表明，垂直磁场强度的增大可以使得等离子体温度、密度、βp和自举电流份额获得提升，为等离子体参数高参数，特别是βp提供了一种可能性参考。

关键词:  , EAST；垂直磁场；压缩等离子体