Theory of a time dependent magnetic field lens

Authors: Calvo, M.1; Paola, P.2

Source: Optik – International Journal for Light and Electron Optics, Volume 113, Number 1, 1 April 2002 , pp. 31-34(4)

Publisher: Urban & Fischer

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Abstract:

A time dependent magnetic field lens capable of focusing charged particles and producing images is proposed. The system consists of an axially symmetric ellipsoidal selenoid producing a spatially-homogeneous but time-pulsating magnetic field. A pulsed beam of charged particles drifting parallel to the coil axis are shown to be focused and particles emitted by some object to form an image. The main advantage of this lens is that it does not depend on the paraxial approximation and therefore operates, in principle, with no geometric aberrations and handles wider cross sectional beams. A new form of aberration results from the finite duration of the beam pulses.

Document Type: Original Article

DOI: http://dx.doi.org/10.1078/0030-4026-00108

Affiliations: 1: Instituto de Física, Universidad Católica de Valparaíso, P. O. Box 4059, Valparaíso, Chile and Departamento de Física, Universidad Técnica Federico Santa María. Av. España 1680, Valparaíso, Chile 2: Instituto de Física, Universidad Católica de Valparaíso, P. O. Box 4059, Valparaíso, Chile

Publication date: April 1, 2002

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