Phase‐space matching between bent Laue and flat Bragg crystals. (24th October 2019)

• Record Type: Journal Article
• Authors: Zhong, Z.; Hasnah, M.; Broadbent, A.; Dooryhee, E.; Lucas, M.
• Is Part Of: Journal of synchrotron radiation. Volume 26:Part 6(2019)
• Page Start: 1917
• Page End: 1923
• Publication Date: 2019-10-24
• Subjects: bent Laue crystals -- Dumond diagram -- phase‐contrast imaging -- analyser‐based imaging -- diffraction‐enhanced imaging -- monochromator -- analyzers -- phase space -- high‐energy X‐rays; Synchrotron radiation -- Periodicals; Free electron lasers -- Periodicals; 539.73505
• DOI: 10.1107/S1600577519010774
• Languages: English
• ISSNs: 0909-0495

Abstract

Abstract : Conditions for phase‐space matching between a bent Laue crystal and a flat Bragg crystal, and between a double‐bent Laue monochromator and a flat Bragg crystal, are derived. The concept of phase‐space manipulation via a bent Laue crystal is introduced and applied to practical examples of phase‐contrast X‐ray imaging. Abstract : Through phase‐space analysis of Dumond diagrams for a flat Bragg crystal, a single bent Laue crystal and a monochromator consisting of double‐bent Laue crystals, this work shows that it is possible to match the flat Bragg crystal to both the single‐crystal and double‐crystal Laue monochromators. The matched system has the advantage that the phase space of the bent crystal's output beam is much larger than that of the flat crystal, making the combined system stable. Here it is suggested that such a matched system can be used at synchrotron facilities to realize X‐ray dark‐field imaging, analyzer‐based imaging and diffraction‐enhanced imaging at beamlines using double‐Laue monochromators.