1962•Journal of Electronics and ControlRequires access

A Study of some Properties of an Electrostatic Quadrupole Lens using an Automatic Electron Trajectory Tracer†

B. C. Gregory, K.F. Sander

Abstract

A particular form of electrostatic quadrupole lens has been investigated with the aid of an electron trajectory tracer. The lens consists of two co-axial cylinders, the outer being at cathode potential and the inner at anode potential. Two symmetrically placed longitudinal slots in the inner produce a quadrupole-type field near the axis. Focal length, focal point and spherical aberration coefficient are given as functions of slot length for the two planes of symmetry.

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Key concepts: Electrostatic lens, Quadrupole, Lens (geology), Magnetic lens, Electron, Optics, Physics, Trajectory