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A double-crystal diamond (111) monochromator recently implemented at theLinac Coherent Light Source (LCLS) enables splitting of the primary X-ray beaminto a pink (transmitted) and a monochromatic (reflected) branch. The firstmonochromator crystal with a thickness of 100 um provides sufficient X-raytransmittance to enable simultaneous operation of two beamlines. Here we reporton the design, fabrication, and X-ray characterization of the first and second(300-um-thick) crystals utilized in the monochromator and the opticalassemblies holding these crystals. Each crystal plate has a region of about 5 X2 mm2 with low defect concentration, sufficient for use in X-ray optics at theLCLS. The optical assemblies holding the crystals were designed to providemounting on a rigid substrate and to minimize mounting-induced crystal strain.The induced strain was evaluated using double-crystal X-ray topography and wasfound to be small over the 5 X 2 mm2 working regions of the crystals.

All-diamond optical assemblies for a beam-multiplexing X-ray monochromator at the Linac Coherent Light Source