All-diamond optical assemblies for a beam-multiplexing X-ray monochromator at the Linac Coherent Light Source
Abstract
A double-crystal diamond (111) monochromator recently implemented at the Linac Coherent Light Source (LCLS) enables splitting of the primary X-ray beam into a pink (transmitted) and a monochromatic (reflected) branch. The first monochromator crystal with a thickness of 100 um provides sufficient X-ray transmittance to enable simultaneous operation of two beamlines. Here we report on the design, fabrication, and X-ray characterization of the first and second (300-um-thick) crystals utilized in the monochromator and the optical assemblies holding these crystals. Each crystal plate has a region of about 5 X 2 mm2 with low defect concentration, sufficient for use in X-ray optics at the LCLS. The optical assemblies holding the crystals were designed to provide mounting on a rigid substrate and to minimize mounting-induced crystal strain. The induced strain was evaluated using double-crystal X-ray topography and was found to be small over the 5 X 2 mm2 working regions of the crystals.
Keywords
Cite
@article{arxiv.1401.5879,
title = {All-diamond optical assemblies for a beam-multiplexing X-ray monochromator at the Linac Coherent Light Source},
author = {S. Stoupin and S. A. Terentyev and V. D. Blank and Yu. V. Shvyd'ko and K. Goetze and L. Assoufid and S. N. Polyakov and M. S. Kuznetsov and N. V. Kornilov and J. Katsoudas and R. Alonso-Mori and M. Chollet and Y. Feng and J. M. Glownia and H. Lemke and A. Robert and S. Song and M. Sikorski and D. Zhu},
journal= {arXiv preprint arXiv:1401.5879},
year = {2014}
}