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Self‐filtering extremely inclined X‐ray crystal monochromator
Author(s) -
Hrdá Jaromíra,
Hrdý Jaromír
Publication year - 2011
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/s0021889811040763
Subject(s) - monochromator , optics , diffraction , radiation , bragg's law , refraction , crystal (programming language) , beam (structure) , wavelength , physics , x ray optics , range (aeronautics) , x ray , materials science , computer science , composite material , programming language
It is shown that an extremely inclined X‐ray double‐crystal monochromator can diffract a beam with the required wavelength and at the same time may reflect a great deal of unwanted radiation in a broad range of Bragg angles. This is a generalization of the idea of Cowan & Brennan [ Rev. Sci. Instrum. (1989), 60 , 1987–1990], which partially solves the radiation heat load problem. The properties of such a device are discussed. It is shown that in some cases the diffracted beam may be significantly broadened as a result of refraction effects. In these cases a four‐crystal arrangement or an additional mirror is necessary.