Design and investigate the optical characteristics of single polepiece magnetics lenses

Computational analysis has been presented in this paper to discuss one of the approaches of optimum synthesis for the design of magnetics lenses (analytical method). This investigation concentrates on finding the optimum design for single-pole piece magnetics lenses magnetically unsaturated to use in construction magnetics optical systems for transmission electron microscopes (TEM). In this investigation, the same computer program (EOD) program is the geometry of the magnetic lens and the axial magnetic field generated and drawing lines of magnetic flux through the lens. The electron beam's trajectory and objective optical characteristics have been calculated, taking the values of axial magnetics field as input data to calculate the objective length of focal and coefficient of aberrations (spherical and chromatic). In present work has been studied the impact of geometrical parameters for magnetics lenses (axial bore diameter). This investigation's importance is the possibility of determining suitable geometry of the magnetics lenses for benefiting from it in making transmission electron microscopes.