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The three‐dimensional resolution function of the four‐reflection monochromator: a route to a higher intensity
Author(s) -
Van Der Sluis P.
Publication year - 1994
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889893006387
Subject(s) - monochromator , reflection (computer programming) , intensity (physics) , optics , resolution (logic) , function (biology) , physics , materials science , computer science , artificial intelligence , biology , wavelength , evolutionary biology , programming language
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.