Applications of mosaic crystals to high-brilliance x-ray optics

Andreas K. Freund

doi:10.1117/12.138715

20 January 1993 Applications of mosaic crystals to high-brilliance x-ray optics

Andreas K. Freund

Proceedings Volume 1740, Optics for High-Brightness Synchrotron Radiation Beamlines; (1993) https://doi.org/10.1117/12.138715
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

Usually perfect crystals are used as x-ray monochromators for low-emittance/high brilliance beamlines because their reflection widths often match the angular divergence of synchrotron x- ray beams. However, this matching is not always the best condition to optimize an experiment and in several cases intensity can be gained without loss in resolution by choosing mosaic crystals. Moreover, the matching is quite generally not fulfilled at high x-ray energies and here mosaic crystals would be especially useful. There are other applications presently under consideration at the ESRF and elsewhere, in particular for beryllium and diamond single crystals that have the advantage to absorb an only small fraction of the incoming flux while reflecting efficiently the useful photons thereby decreasing the heat load problem to an acceptable level. The inconvenience of increasing the angular beam divergence inherent to mosaic crystals can often be tolerated and substantially reduced in the scattering plane by inserting a second crystal. The expected efficiency depends on the uniformity of the mosaic distribution that is generally not easy to obtain as shown by rocking curve techniques and by topography. Experimental results obtained with several single crystal materials are presented and compared with their theoretically possible performance. Various applications presently proposed are then mentioned.

Citation Download Citation

Andreas K. Freund "Applications of mosaic crystals to high-brilliance x-ray optics", Proc. SPIE 1740, Optics for High-Brightness Synchrotron Radiation Beamlines, (20 January 1993); https://doi.org/10.1117/12.138715

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