A simple method for mitigating error in the fixed‐offset of a double‐crystal monochromator. (18th October 2021)

• Record Type: Journal Article
• Authors: Sterbinsky, George E.; Heald, Steve M.
• Is Part Of: Journal of synchrotron radiation. Volume 28:Part 6(2021)
• Page Start: 1737
• Page End: 1746
• Publication Date: 2021-10-18
• Subjects: X‐ray monochromator -- double‐crystal monochromators -- X‐ray absorption spectroscopy -- X‐ray instrumentation; Synchrotron radiation -- Periodicals; Free electron lasers -- Periodicals; 539.73505
• DOI: 10.1107/S1600577521008626
• Languages: English
• ISSNs: 0909-0495

Abstract

Abstract : Sources of error in the fixed offset between incoming and outgoing beams of a double‐crystal monochromator are considered, and in order to correct such errors, a method for calibrating the monochromator crystal gap from measured variation in the X‐ray beam height is provided. Abstract : In order to maintain a constant monochromatic synchrotron X‐ray beam height for all energies, the separation between the crystals of a double‐crystal monochromator is typically adjusted, via translation of the second crystal, while X‐ray energy is varied, via rotation of the crystal pair. The ability to accurately translate the second crystal requires precise knowledge of the separation between the two crystals and, when present, crystal miscuts. Here, a simple method for calibrating the crystal gap from measured variation in the X‐ray beam height that eliminates error in the fixed beam offset is provided.