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Science
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| Number of pages / Number of words: |
13 / 3428 |
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In order to improve performance we must be able to control it. In figure 1 the upper two lenses, the condensers (3), control the beam's diameter and demagnification occurs, when the diameter is reduced from 50 im to around 5 nm. Electron lenses are very different from their optical counterparts.
Figure 3: Simplified electron lens (cross-section)
A coil of wire, with its axis aligned along the beam's path, is partially enclosed in a cylindrical iron case...
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Electron lenses are very different from their optical counterparts.
Figure 3: Simplified electron lens (cross-section)
A coil of wire, with its axis aligned along the beam's path, is partially enclosed in a cylindrical iron case. There is a small gap in the inner bore of the case. When a direct current is passed through the coil an electromagnet is produced, with magnetic poles (N and S), created at the gap in the iron case...
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