METHOD FOR AXIAL ALIGNMENT OF CHARGED PARTICLE BEAM AND CHARGED PARTICLE BEAM SYSTEM
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United States of America Patent
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Aug 27, 2014
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Nov 16, 2010
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Abstract
A method for axial alignment of a charged particle beam relative to at least three stages of multipole elements and a charged particle beam system capable of making the axial alignment. Some parts of the orbit of the beam or the distributions of three astigmatic fields, or both, are simultaneously translated in a direction perpendicular to the optical axis such that astigmatisms of the same order and same type due to axial deviations between successive ones of the astigmatic fields cancel.
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