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. 2009 Feb 25;16(Pt 2):173–182. doi: 10.1107/S0909049508040120

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© Robin L. Owen et al. 2009

This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.

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The effect of drilling on the optical and X-ray transmission properties of the Schwarzschild objective. (a) Ray traces calculated using the ray-tracing software Zemax (http://www.zemax.com/) from the focal point (blue) and a point a distance δ off-axis (green) through the system are shown. Translation of a knife-edge across the X-ray beam allows the profile to be determined with and without the spectroscopy objective in place; no change is observed in either (b) the horizontal or vertical (data not shown) directions.