تأثير نسبة مساحتي الملفين و المسافة الفاصلة بينهما على الأداء البصري في العدسة المغناطيسية المكثفة-الشيئية

Abstract EN

The work handles the design of an asymmetric double polepiece magnetic lens for the condenser-objective mode having optimum properties through the change of coils area's ratio and their separated distance, which leads to a highest flux density peak of the magnetic field with a lowest spherical aberration coefficient, at the relativistic corrected voltage (Vr = 200 kV) and excitation of (NI = 10.5 kA-t).

The calculation has been made for the magnetic flux lines trajectories and optical properties to limit the defects in the lens and consequently improve the optical performance of the condenser-objective magnetic lens.