Dynamic microapertures

D. Axford, G. Evans

We have developed a miniature four blade aperture system that can be positioned between on axis visualisation system and sample crystal. On the I24 microfocus beamline this aperture has so far permitted the beam to be resized in both vertical and horizontal directions down to a minimum of 3 microns. The minimum size achievable is limited by the beam convergence at the sample and the aperture blade distance from the sample. The apetures have already been successfully used to record diffraction data from crystals only 1 micron in size.

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