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Three-energy focusing Laue monochromator for the diamond light source x-ray pair distribution function beamline I15-1

DOI: 10.1063/1.4952877 DOI Help

Authors: John Sutter (Diamond Light Source) , Philip Chater (Diamond Light Source) , Michael R. Hillman (Diamond Light Source) , Dean S. Keeble (Diamond Light Source) , Matt G. Tucker (ISIS, Diamond Light Source) , Heribert Wilhelm (Diamond Light Source)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: AIP Conference Proceedings
Peer Reviewed: No

State: Published (Approved)
Published: July 2016

Open Access Open Access

Abstract: The I15-1 beamline, the new side station to I15 at the Diamond Light Source, will be dedicated to the collection of atomic pair distribution function data. A Laue monochromator will be used consisting of three silicon crystals diffracting X-rays at a common Bragg angle of 2.83°. The crystals use the (1 1 1), (2 2 0), and (3 1 1) planes to select 40, 65, and 76 keV X-rays, respectively, and will be bent meridionally to horizontally focus the selected X-rays onto the sample. All crystals will be cut to the same optimized asymmetry angle in order to eliminate image broadening from the crystal thickness. Finite element calculations show that the thermal distortion of the crystals will affect the image size and bandpass.

Journal Keywords: Diamond; Particle distribution functions; Monochromators; Atomic and molecular beam sources; Finite element methods

Subject Areas: Physics, Technique Development


Instruments: I15-1-X-ray Pair Distribution Function (XPDF)

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1.4952877.pdf