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G D Archard1
Published under licence by IOP Publishing Ltd
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Citation G D Archard 1960 Br. J. Appl. Phys. 11 521
DOI 10.1088/0508-3443/11/11/310
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Knowledge of the fifth order spherical aberration of magnetic lenses is required in order to show how much error is left when third order aberration is corrected. This is found theoretically for lenses of the bell-shaped field type. It is found that, for lenses of moderate strength, third and fifth order coefficients are numerically very similar.