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The scanning four-bounce monochromator for beamline I20 at the Diamond Light Source

DOI: 10.1107/S1600577518008974 DOI Help

Authors: Shusaku Hayama (Diamond Light Source) , Graham Duller (Diamond Light Source) , John Sutter (Diamond Light Source) , Monica Amboage (Diamond Light Source) , Roberto Boada (Diamond Light Source) , Adam Freeman (Diamond Light Source) , Luke Keenan (Diamond Light Source) , Brian Nutter (Diamond Light Source) , Leo Cahill (Diamond Light Source) , Pete Leicester (Diamond Light Source) , Ben Kemp (Diamond Light Source) , Nicholas Rubies (Diamond Light Source) , Sofia Diaz-Moreno (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Synchrotron Radiation , VOL 25

State: Published (Approved)
Published: September 2018

Open Access Open Access

Abstract: A description of the technical and design details of a scanning four-bounce crystal monochromator that has recently been commissioned for the Versatile X-ray Absorption Spectroscopy (XAS) beamline at Diamond Light Source is presented. This device consists of two independent rotary axes of unique design which are synchronized using a multiple read-head encoder system. This monochromator is shown to be capable of maintaining the flux throughput of the Bragg axes without the need of any external feedback mechanism from 4 to 20 keV. The monochromator is currently equipped with cryogenically cooled crystals with the upstream axis consisting of two independent Si(111) crystals and a pair of channel-cut crystals in the downstream axis. The possibility of installing an additional Si(311) crystal-set to extend the energy range to 34 keV is incorporated into the preliminary design of the device. Experimental data are presented showing the exceptional mechanical stability and repeatability of the monochromator axes.

Journal Keywords: X-ray absorption spectroscopy; beamline; monochromator; optics

Subject Areas: Physics

Instruments: I20-Scanning-X-ray spectroscopy (XAS/XES)

Added On: 08/08/2018 08:39


Discipline Tags:

Optics Physics

Technical Tags: