Open AccessSide‐bounce beamlines using single‐reflection diamond monochromators at Cornell High Energy Synchrotron Source
Author(s) -
Stoupin Stanislav,
Krawczyk Thomas,
Sagan David,
Temnykh Alexander,
Smieska Louisa,
Woll Arthur,
Ruff Jacob,
Lyndaker Aaron,
Pauling Alan,
Croom Brendan P.,
Trigg Edward B.
Publication year - 2021
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s160057752100120x
Subject(s) - monochromator , beamline , undulator , optics , diamond , synchrotron radiation , high energy x rays , synchrotron , bragg's law , reflection (computer programming) , advanced photon source , synchrotron radiation source , beam (structure) , materials science , physics , diffraction , wavelength , computer science , composite material , programming language
The design and implementation of new beamlines featuring side‐bounce (single‐reflection) diamond monochromators at Cornell High Energy Synchrotron Source (CHESS) are described. Undulator radiation is monochromated using an interchangeable set of diamond crystal plates reflecting radiation in the horizontal (synchrotron) plane, where each crystal plate is set to one of the low‐index Bragg reflections (111, 220, 311 and 400) in either Bragg or Laue reflection geometries. At the nominal Bragg angle of 18° these reflections deliver monochromated X‐rays with photon energies of 9.7, 15.9, 18.65 and 22.5 keV, respectively. An X‐ray mirror downstream of the diamond monochromator is used for rejection of higher radiation harmonics and for initial focusing of the monochromated beam. The characteristics of the X‐ray beam entering the experimental station were measured experimentally and compared with the results of simulations. A reasonable agreement is demonstrated. It is shown that the use of selected high‐dislocation‐density `mosaic' diamond single‐crystal plates produced using the chemical vapor deposition method yields a few‐fold enhancement in the flux density of the monochromated beam in comparison with that delivered by perfect crystals under the same conditions. At present, the Functional Materials Beamline at CHESS, which is used for time‐resolved in situ characterization of soft materials during processing, has been outfitted with the described setup.