تأثير بعض المعلمات الهندسية على خواص عدسة مغناطيسية ثلاثية

Abstract

Abstract
The Present work aim at is mainly concern with compute the projector properties of the doublet (triple pole-piece or double air gap)magnetic lens by using of well-known magnetic field model in electron optics ,which is (Gray). This model is employed to approximate the axial magnetic flux density distribution of proposed magnetic lens. The influence of the most effective optimization parameters to obtaining a rotation and distortion free images has been studied .Results have clearly shown that the optimization parameter (d) the axial bore diameter in mathematical function has a considerable effect on the lens aberration, the reconstructed pole-pieces