Method for axial alignment of charged particle beam and charged particle beam system
First Claim
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1. A method of making axial alignment of a charged particle beam in a charged particle beam system, said method comprising the steps of:
- producing at least three astigmatic fields; and
translating parts of the orbit of the charged particle beam simultaneously along a direction perpendicular to an optical axis such that astigmatisms of the same order and same type due to axial deviations between successive ones of the astigmatic fields cancel out each other by deflectors mounted between said astigmatic fields.
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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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7 Claims
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1. A method of making axial alignment of a charged particle beam in a charged particle beam system, said method comprising the steps of:
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producing at least three astigmatic fields; and translating parts of the orbit of the charged particle beam simultaneously along a direction perpendicular to an optical axis such that astigmatisms of the same order and same type due to axial deviations between successive ones of the astigmatic fields cancel out each other by deflectors mounted between said astigmatic fields. - View Dependent Claims (2, 3)
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4. A charged particle beam system comprising:
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at least three stages of multipole elements for producing astigmatic fields; and deflectors mounted between the multipole elements and operating to translate parts of the orbit of a charged particle beam simultaneously along a direction perpendicular to an optical axis such that astigmatisms of the same order and same type due to axial deviations between successive ones of the multipole elements cancel out each other. - View Dependent Claims (5, 6, 7)
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Specification