典型静磁阱的磁场结构

The Field Structures of Some Typical Magnetostatic Traps

中性粒子的静磁囚禁依赖于非均匀电磁场与粒子的磁多极矩之间的相互作用,能提供这种非均匀场的电流结构被称为静磁阱.具有不同场结构的静磁阱有着各自不同的静磁囚禁特性.这里呈现的几种电流组态是一些最典型的静磁阱,也是构成复杂静磁阱的基本组成部分.在柱坐标之下,讨论了这些典型静磁阱中磁感应强度的精确表达式,并且在近轴条件下,利用泰勒级数展开等技巧,导出场的近似表达.

The magnetostatic trapping of neutral particles is based on the interaction between the magnetic multipole momeats of the particles and the non-uniform electromagnetic fields. The current configurations that can produce such .fields are called as magnetostatic traps. In this paper, some basic and simple magnetostatic traps were discasd, which are important parts of other complex magnetostatie traps. In cylindrical coordinates, by the Blot-Savart law and other techniques, the exact expressions of magnetic induction of such traps are presented. Under the paraxial condition, considering the multipole polynomial expansions, the approximate expressioas are obtained.