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Properties of Electron Lenses

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Magnetic Electron Lenses

Part of the book series: Topics in Current Physics ((TCPHY,volume 18))

Abstract

A magnetic lens is defined as an axisymmetric magnetic field existing in a finite axial interval between two field-free regions. The effect of saturation of the shielding material on the axial field distribution is discussed. Parameters describing lens strength and field form are defined, and scaling laws discussed. Results of numerical field calculations are given together with analytical models for symmetrical and asymmetrical lens fields. Field models are presented for which the paraxial trajectory equation can be solved analytically. A review is given of the paraxial properties, such as focal lengths, focal positions and chromatic aberration coefficients, and their dependence on lens strength and gap-bore ratio defining their field form, as well as unified representations in which each of these dependences is approximately described by one single curve in which the lens size and the gap-bore ratio occur only in the horizontal and vertical scales. A classification of third-order aberrations is given together with their unified representations for the limiting case of high magnification.

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Authors
  1. F. Lenz
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Editors and Affiliations

  1. Laboratoire d’Optique Electronique du C.N.R.S., B.P. 4347, F-31055, Toulouse Cedex, France

    Peter W. Hawkes

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© 1982 Springer-Verlag Berlin Heidelberg

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Lenz, F. (1982). Properties of Electron Lenses. In: Hawkes, P.W. (eds) Magnetic Electron Lenses. Topics in Current Physics, vol 18. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-81516-4_3

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  • DOI: https://doi.org/10.1007/978-3-642-81516-4_3

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-81518-8

  • Online ISBN: 978-3-642-81516-4

  • eBook Packages: Springer Book Archive

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