Analytic Solution for a Quartic Electron Mirror

Authors

Jack C. Straton, Portland State UniversityFollow

Published In

Ultramicroscopy

Document Type

Citation

Publication Date

12-31-2014

Abstract

A converging electron mirror can be used to compensate for spherical and chromatic aberrations in an electron microscope. This paper presents an analytical solution to a diode (two-electrode) electrostatic mirror including the next term beyond the known hyperbolic shape. The latter is a solution of the Laplace equation to second order in the variables perpendicular to and along the mirror׳s radius (z2−r2/2) to which we add a quartic term (kλz4). The analytical solution is found in terms of Jacobi cosine-amplitude functions. We find that a mirror less concave than the hyperbolic profile is more sensitive to changes in mirror voltages and the contrary holds for the mirror more concave than the hyperbolic profile.

Locate the Document

https://doi.org/10.1016/j.ultramic.2014.09.003

DOI

10.1016/j.ultramic.2014.09.003

Persistent Identifier

https://archives.pdx.edu/ds/psu/25887

Citation Details

Straton, J. C. (2015). Analytic solution for a quartic electron mirror. Ultramicroscopy, 148, 168-179.