What is it about?

To generate a wide and parallel x-ray beam from diffraction, a large monochromator crystal, with a high crystalline perfection is needed. To diffract a 1.49 KeV X-ray beam, crystals with large lattice spacing are needed. One of the best crystal available for this X-ray energy is ammonium dihydrogen phosphate (ADP), but there little knownledge about the crystallographic perfection in large crystals.

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Why is it important?

The proposed X-ray expander is important because it permits to generate a parallel and wide X-ray beam, a condition which hard to fulfill on ground.


We met unexpected challenges for the required characterization of crystal quality of such big crystals. The methods proposed are original and we expect some discussion on this paper.

Dr Claudio Ferrari

Read the Original

This page is a summary of: Characterization of ammonium dihydrogen phosphate crystals for soft X-ray optics of the Beam Expander Testing X-ray facility (BEaTriX), Journal of Applied Crystallography, May 2019, International Union of Crystallography,
DOI: 10.1107/s1600576719004631.
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