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Double Focusing with Wedge‐Shaped Magnetic Fields

机译：楔形磁场双重聚焦

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摘要

Geometric focusing in two directions for charged particles of a single energy is produced with a wedge‐shaped magnetic field. The uniform field in the gap focuses in the plane of the pole faces, while the fringe fields focus perpendicular to the pole faces. With a single wedge the energy dispersion is too large for the weak electron intensities available with our source; i.e., for are asonable size slit at the collector only a narrow energy width and, thus, a small number of electrons is accepted. With the use of two wedge‐shaped fields the energy dispersion can take a wide range of values, even zero in the first order. General formulas for either one or two magnet systems are derived for the focusing conditions, the energy dispersion, the second‐order beam spread, and the effect of source width. These formulas are then applied to two special cases from which practically all design requirements can be obtained. Finally, a design is recommended for which the following requirements are fulfilled : five percent energy spread in an inch collector slit, large angular collection, and the same size source and collector slits.
机译：楔形磁场在两个方向上对单个能量的带电粒子进行几何聚焦。间隙中的均匀场集中在极面的平面上，而边缘场垂直于极面聚焦。对于单个楔形来说，对于我们的光源可用的弱电子强度而言，能量色散太大。即，对于在集电极处合理尺寸的狭缝，仅窄的能量宽度，因此，可以接受少量的电子。通过使用两个楔形场，能量色散可以取值范围很广，甚至在一阶为零。针对聚焦条件，能量色散，二阶电子束展宽和光源宽度的影响，推导了一个或两个磁体系统的通用公式。然后将这些公式应用于两个特殊情况，从中可以实际上获得所有设计要求。最后，建议满足以下要求的设计：在1英寸的收集器狭缝中散布5％的能量，大角度收集以及相同尺寸的源极和收集器狭缝。

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  • 来源
    《Review of Scientific Instruments》 |1951年第3期|共8页
  • 作者

    Camac Morton;

  • 作者单位

    Laboratory of Nuclear Studies, Cornell University, Ithaca, New York;

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  • 正文语种 eng
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