Abstract
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
Highlights
The Effect of Coils Area's Ratio and their Separated Distance on the Optical Performance of the Condenser-Objective Magnetic Lens
ABSTRACT 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 improve the optical performance of the condenser-objective magnetic lens.
Summary
The Effect of Coils Area's Ratio and their Separated Distance on the Optical Performance of the Condenser-Objective Magnetic Lens. يتضمن هذا الجزء من البحث اختيار قيم مختلفة من نسبة مساحة مقطع الملف الأول إلى مساحة مقطع الملف الثاني) (A1/A2=0.2, 0.25, 0.33, 0.4, 0.5, 0.66, & 1.0لكل عدسة على التوالي ،واستخدام برنامج AMAG ) (Lencova', 1986لإيجاد توزيع كثافة المجال المغناطيسي لهذه العدسات المتماثلة في أبعادها الهندسية والمختلفة في النسبة بين مساحتي مقطعي ملفيها ،عند تهيج ثابت ) .(NI=10.5 kA-tويبين الشكل ) (2ان العدسة ذات النسبة )
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