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Figure 5
Far-field beam profile image and visualization camera. At large distances (>500 mm) from the capillary tip, the X-ray microbeam is annular in form as seen by fluorescence on a CdWO4 crystal (a). The direct unfocused beam is the disc at the center while the focused beam has diverged into a halo. Black grid lines mark 1 mm squares. A mini video camera equipped with optical spacers and CdWO4 crystal is fixed to the protective `garage door' shield on the crystallography CCD detector and can be easily moved into place to check the alignment of the X-ray optic (b).

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