| 摘要 |
The invention provides a lens system for a plurality of charged particle beams. Therein, at least one common excitation coil (106a,b) for at least two lens modules is provided. The lens modules comprise a first pole piece, a second pole piece and at least two openings (22) for charged particle beams along optical axes (24). The lens modules constitute a component and share the excitation coil. Thereby, raw material availability, processing of work pieces and symmetry conditions for the lens fields are improved.
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