Abstract
Several multipole correctors compensating for the unavoidable axial aberrations of round lenses are outlined. It is shown that the correction of chromatic aberration requires superposed electric and magnetic quadrupole fields which act as first-order Wien filters. The hexapole semi-aplanat which eliminates third-order spherical aberration and the radial off-axial coma is discussed in detail as well as quadrupole–octopole correctors compensating for spherical and chromatic aberration.
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Rose, H. (2012). Correction of Aberrations. In: Geometrical Charged-Particle Optics. Springer Series in Optical Sciences, vol 142. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-32119-1_9
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DOI: https://doi.org/10.1007/978-3-642-32119-1_9
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