Stoupin S, Terentyev S A, Blank V D, Shvyd'ko Yu V, Goetze K, Assoufid L, Polyakov S N, Kuznetsov M S, Kornilov N V, Katsoudas J, Alonso-Mori R, Chollet M, Feng Y, Glownia J M, Lemke H, Robert A, Sikorski M, Song S, Zhu D
Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois, USA.
Technological Institute for Superhard and Novel Carbon Materials, Troitsk, Russian Federation.
J Appl Crystallogr. 2014 Aug 1;47(Pt 4):1329-1336. doi: 10.1107/S1600576714013028.
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 µm, provides sufficient X-ray transmittance to enable simultaneous operation of two beamlines. This article reports the design, fabrication and X-ray characterization of the first and second (300 µm-thick) crystals utilized in the monochromator and the optical assemblies holding these crystals. Each crystal plate has a region of about 5 × 2 mm 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 × 2 mm working regions of the crystals.
直线加速器相干光源（LCLS）最近安装的双晶金刚石（111）单色仪能够将初级X射线束分离为粉红色（透射）和单色（反射）分支。第一块单色仪晶体厚度约为100 µm，具有足够的X射线透射率，可实现两条光束线的同时运行。本文报道了用于单色仪的第一块和第二块（厚度为300 µm）晶体以及固定这些晶体的光学组件的设计、制造和X射线表征。每块晶体板都有一个约5×2 mm的低缺陷浓度区域，足以用于LCLS的X射线光学。固定晶体的光学组件设计用于安装在刚性基板上，并尽量减少安装引起的晶体应变。使用双晶X射线形貌术评估了诱导应变，发现在晶体的5×2 mm工作区域内应变很小。
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