Chapter Two: Definitions, notation, and methods of analysis
Peter Hawkes
Abstract
The optics of rotationally symmetric (round) electrostatic and magnetic lenses, electrostatic and magnetic quadrupoles and octopoles is recapitulated at length. Formulae for cardinal elements and aberration coefficients are then given for various model potentials. Fifth-order aberrations are mentioned briefly.
Keywords
Round lenses; Quadrupoles; Octopoles; Aberration coefficients; Model potentials
1: Equations of motion
The behavior of electrons in the electric or magnetic fields of well-aligned electron lenses is completely determined by the magnetic field on the optic axis and by the electrostatic and magnetostatic potential functions. In round magnetic ...
