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Figure 1
Possible schemes for refractive transmission lenses for the focusing of X-rays. (a) and (b) show a double concave and a plane concave lens of parabolic shape. (c) is the standard Fresnel lens obtained directly from (b), while (d) is a compacted design. (e) is the concept for the present clessidra prism lens. All lenses are drawn to scale for identical focal length. R is the radius of curvature of the lens surface in its centre as shown in (a).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 13| Part 3| April 2006| Pages 239-252
doi:10.1107/S0909049506004936
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