论文标题
局部和全局陀螺仪计算的无碰撞区域流量阻尼中的准对称恒星剂中的比较
Comparison of local and global gyrokinetic calculations of collisionless zonal flow damping in quasi-symmetric stellarators
论文作者
论文摘要
针对磁导管，磁通面和全容量几何形状的准对称恒星平衡，计算了Zonal流的线性无碰撞阻尼。从螺旋形式对称实验（HSX），HSX的断裂对称性配置以及国家紧凑型恒星体实验（NCSX）的准轴对称几何形状（NCSX）的准对称性结构（NCSX）中研究了平衡。小径向波数的纬向流动振荡和长期阻尼会影响纬向流动的演变，而纬向流量残留为零。振荡频率和阻尼速率取决于根据理论的弹跳平均径向颗粒漂移。虽然通量表面上的每个通量管都是唯一的，但HSX或NCSX中的几个不同的通量管可以从磁通量压缩的划分后表面计算，但给定适当的平行范围。磁通式表面或通量管计算可以准确地重现适中$ k_x $的全册长期残留物，但是振动和阻尼时间尺度更长的局部表示形式，尤其是对于小$ k_x $接近系统尺寸的小$ k_x $。
The linear collisionless damping of zonal flows is calculated for quasi-symmetric stellarator equilibria in flux-tube, flux-surface, and full-volume geometry. Equilibria are studied from the quasi-helical symmetry configuration of the Helically Symmetric eXperiment (HSX), a broken symmetry configuration of HSX, and the quasi-axial symmetry geometry of the National Compact Stellarator eXperiment (NCSX). Zonal flow oscillations and long-time damping affect the zonal flow evolution, and the zonal flow residual goes to zero for small radial wavenumber. The oscillation frequency and damping rate depend on the bounce-averaged radial particle drift in accordance with theory. While each flux tube on a flux surface is unique, several different flux tubes in HSX or NCSX can reproduce the zonal flow damping from a flux-surface calculation given an adequate parallel extent. The flux-surface or flux-tube calculations can accurately reproduce the full-volume long-time residual for moderate $k_x$, but the oscillation and damping time scales are longer in local representations, particularly for small $k_x$ approaching the system size.
