Eur. Phys. J. AP 17, 243-245 (2002)
https://doi.org/10.1051/epjap:2002018

Iron-free objective lenses II

Department of Physics, Assiut University, Assiut, Egypt

Corresponding author: amir@aun.eun.eg

Received: 13 July 2001
Accepted: 20 October 2001
Published online: 15 March 2002

Abstract

The main factors limit the field of the magnetic lenses are the current density σ and the accelerating voltage V_r. Optical properties such as chromatic and spherical aberration have been studied in terms of σ and V_r. Values of the other aberration coefficients for the optimum lens size corresponding to the desired minimum aberration are estimated.