螺旋驱动球环等离子体双流体流动平衡的数值研究
Numerical Study of Two-fluid Flowing Equilibria of Helicity-driven Spherical Torus Plasmas
摘要：
采用有限差分法和边界元法相结合的方法，数值求解了螺旋驱动球环（HD-ST）的两相流平衡位形。结果表明，中心导体附近的电子流体与外环向场有关，而离子流体与外环向场无关。磁性配置从高- $q$ HD-ST（$q$ >1），具有顺磁环向场和低- $β$（体积平均$β$值，（$<β>\approx$ 2%）通过螺旋驱动的球马克和RFP到超低- $q$ HD-ST（0<q<1）与对角磁环向场和高- $β$（$β \approx 18\%），因为内边缘区域的外部环向场减小并反转符号。当双流体中离子偏磁漂移占主导地位时，双流体效应在这种平衡转变中更为显著。
英文摘要：
Two-fluid flowing equilibrium configurations of a helicity-driven spherical torus (HD-ST) are numerically determined by using the combination of the finite difference and the boundary element methods. It is found from the numerical results that electron fluids near the central conductor are tied to an external toroidal field and ion fluids are not. The magnetic configurations change from the high-$q$ HD-ST ($q$>1) with paramagnetic toroidal field and low-$β$ (volume average $β$ value, ($<β>\approx$ 2 %) through the helicity-driven spheromak and RFP to the ultra low-$q$ HD-ST (0<q<1) with diagmagnetic toroidal field and high-$β$ ($β\approx 18\%) as the external toroidal field at the inner edge region decreases and reverses the sign. The two-fluid effecs are more significant in this equilibrium transition when the ion diagmagnetic drift is dominant in the flowing two-fluid.
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