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Proceedings Paper

Saturated electron lens design using a second-order finite element method
Author(s): John Hodkinson; Khadija Tahir
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Paper Abstract

The design of electron optical systems involves the calculation of electromagnetic fields to high accuracy. The first-order finite element method has been extensively used in electron optical design. In the design of magnetic lenses, for instance, discrepancies have been found between computed and measured fields. This discrepancy becomes larger as the saturation level is increased. Rapid variations of permeability with distance causes problems when using a first-order finite element method. These problems are overcome by the application of a second-order finite element method. The method also allows the easier modelling of curved electrodes.

Paper Details

Date Published: 25 September 1995
PDF: 6 pages
Proc. SPIE 2522, Electron-Beam Sources and Charged-Particle Optics, (25 September 1995); doi: 10.1117/12.221587
Show Author Affiliations
John Hodkinson, Imperial College of Science, Technology and Medicine (United Kingdom)
Khadija Tahir, Imperial College of Science, Technology and Medicine (United Kingdom)

Published in SPIE Proceedings Vol. 2522:
Electron-Beam Sources and Charged-Particle Optics
Eric Munro; Henry P. Freund, Editor(s)

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