Abstract
The relation between the coefficients of spherical and chromatic aberration of round magnetic lenses and the flux distribution over a cylindrical surface that touches the pole-piece at some point is studied. The magnetic flux density distribution over the cylindrical surface is approximated by a polygonal line, and the successive approximation is used to determine the optimum field distributions which make either of the aberration coefficients minimum. The minimum spherical and chromatic aberration coefficients and the magnetic flux density corresponding to these are calculated. It is found that the aberration coefficients become larger as the minimum inside diameter of the pole-piece becomes larger.
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