Abstract
The relative intensity passed by a four-reflection monochromator as a function of horizontal and vertical divergence and wavelength is calculated. From this three-dimensional function, the horizontal and vertical divergences, the wavelength band pass and the relative intensity of the monochromator in different settings are calculated. The information is used to design a high-intensity four-reflection monochromator, which is used for applications that require extra intensity. The current design has a 3.8 times higher intensity than the original design but a factor of 15 can be reached without serious redesign of the monochromator. A simple method of calculating rocking-curve peak widths of samples from the monochromator parameters is presented.
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