Abstract
The paraxial equation for rotationally symmetric magnetic lenses is integrated numerically by using the Numerov method. The normalized third-order aperture and second-order chromatic aberration coefficients (C3N and CcN) are calculated. A Fourier representation of the lens field is used, and a search for minimum C3N is carried out by varying the Fourier coefficients. Comparisons with comparable quadrupole doublets, and calculations of C3N and CcN for actual coil systems are presented. The main conclusion is that magnetic round lenses are about a factor of 2 better than comparable magnetic quadrupole doublets as far as the third-order aperture aberration is concerned, but the chromatic aberrations in both systems are comparable.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
