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Figure 3
Scheme of a clessidra half-lens operated behind a beam-limiting aperture. The spectral resolution and the spectral purity behind this lens can be adjusted by translating it perpendicularly to the incident beam in the direction y (double-headed arrows). With sufficiently wide prisms the photon energy can be tuned in a stationary exit slit when the lens is rotated by the angle α around the vertical axis y.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 19| Part 4| May 2012| Pages 492-496
doi:10.1107/S0909049512013027
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