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

Shusaku Hayama, Graham Duller, John P. Sutter, Monica Amboage, Roberto Boada, Adam Freeman, Luke Keenan, Brian Nutter, Leo Cahill, Pete Leicester, Ben Kemp, Nico Rubies, Sofia Diaz-Moreno*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

27 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1556-1564
Number of pages9
JournalJournal of Synchrotron Radiation
Issue number5
Publication statusPublished - Sept 2018


  • beamline
  • monochromator
  • optics
  • X-ray absorption spectroscopy


Dive into the research topics of 'The scanning four-bounce monochromator for beamline I20 at the Diamond Light Source'. Together they form a unique fingerprint.

Cite this