Production and optical properties of an unscreened but localized magnetic field
Production and optical properties of an unscreened but localized magnetic field
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未屏蔽但局部磁场的产生和光学特性
DOI：
10.1063/1.1147004
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发表时间：
1996
影响因子：
1.6
通讯作者：
J. Channing
中科院分区：
文献类型：
--
作者：
F. H. Read;J. Channing
本文描述了一种利用载流线圈产生磁场的技术，该磁场定位良好，随着距离的增加而迅速衰减。该技术的基础是将系统的前四个磁多极矩安排为零。然后研究了这类场的偏转和电子光学性质。结果表明，光束最初会聚到场对称轴上的一点时，会发生偏转，使其仍能穿过对称轴。同样地，从轴发出的光束将是渐近径向的，但方向改变了。
A technique is described of using current carrying coils to produce a magnetic field that is well localized, falling off quickly with distance. The basis of the technique is that the first four magnetic multipole moments of the system are arranged to be zero. The deflection and electron optical properties of this type of field are then investigated. It is shown that a beam that initially converges to a point on the axis of symmetry of the field will be deflected in such a way that it still passes through the axis. Similarly, a beam originating at the axis will be asymptotically radial but with a changed direction.