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Figure 1
(a) Diagram of a cross section of a microfocusing glass capillary; the capillary is drawn to an elliptical internal profile. A divergent X-ray source located in the left focus of the ellipse is reflected on the inside of the glass capillary (shown here in green) towards the second focus of the ellipse, where the sample resides (L is the distance from the source, Lc the actual length of the capillary, F the focal length; the angle θdiv describes the beam divergence at the sample). A beamstop centered upstream of the capillary blocks the direct beam. (Diagram courtesy of S. Cornaby, PhD thesis 2008, Cornell University, USA.) (b) A glass capillary (red) mounted in a precision-bored and reamed brass barrel. The capillary is guided in the front and back in two brass bores while being supported in the center by two Viton O-rings (blue) at 1/4 and 3/4 of its length. A brass cap in the back pushes onto a Viton cushion that holds the capillary in place. A clean-up aperture made of lead is added onto the front of the brass barrel.

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ISSN: 1600-5775
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