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Side-bounce beamlines using single-reflection diamond monochromators at Cornell High Energy Synchrotron Source.

Stanislav Stoupin¹, Thomas Krawczyk¹, David Sagan¹

¹Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York, USA.

Journal of Synchrotron Radiation

|March 2, 2021

Summary

New diamond monochromators at Cornell High Energy Synchrotron Source (CHESS) enhance X-ray beam flux. Using chemical vapor deposition

Keywords:

X-ray monochromators beamlines diamond

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Area of Science:

Materials Science
Synchrotron Radiation Physics
Optics

Background:

Cornell High Energy Synchrotron Source (CHESS) utilizes undulator radiation.
Monochromatization is crucial for X-ray experiments.

Purpose of the Study:

To describe the design and implementation of new beamlines with diamond monochromators at CHESS.
To evaluate the performance of these new monochromators.

Main Methods:

Utilized interchangeable diamond crystal plates with low-index Bragg reflections (111, 220, 311, 400).
Employed Bragg and Laue reflection geometries.
Incorporated an X-ray mirror for harmonic rejection and focusing.
Measured and simulated X-ray beam characteristics.

Main Results:

Achieved monochromated X-rays at energies of 9.7, 15.9, 18.65, and 22.5 keV.
Demonstrated reasonable agreement between experimental measurements and simulations.
Observed a few-fold enhancement in flux density using high-dislocation-density 'mosaic' diamond crystals compared to perfect crystals.

Conclusions:

The new side-bounce diamond monochromator beamlines at CHESS are successfully implemented.
High-dislocation-density diamond crystals offer superior flux density for monochromated X-ray beams.
The Functional Materials Beamline is now equipped with this advanced setup for time-resolved in situ characterization.