Inverse Design of Asymmetrical Magnetic Lenses Using a Mathematical Field Model

The inverse design ol asymmetrical double polepiece magneticelcctron lenses has beei investigated with the aid ofan axial magnetic fielddistribution representetl by a well-known malhematical field modcl inelectron optics. The influence ofthe magnetic field model parameters onthe focal propenies and the polepieces profile ot asymmEtrical magneticelectron lenses has becn taken into account. 'fhe mr.)st effective parameterson the design configuration are the two halfuidths ol the axial magneticfield distribution. Tie results have shown that the polepieces of variousasymmetrical double polepiece magnetic lcnses can be. reconstructedec'ccrCing tc thc Cif{brint halF.':idths of the fiel'l nn th6 ofr.iqq! and irn'ages ide.