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. 2012 Feb 2;117:61–79. doi: 10.6028/jres.117.002

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig 2 — (Left) Double stack monochromator system. Each blade consists of 10 2×2 cm² crystals, mounted on an aluminum plate that can be rotated to any angle to achieve the desired crystal alignment. Each top and bottom blade is coupled together and driven by a single motor. (Right) Vertical focusing is achieved by bending the Al plates (and then translating the array to maintain a centered monochromator), which is done under computer control. The Al plates are contoured so that the mechanical bending produces the correct cylindrical focusing condition [4].