THE CRL'S OPTICAL PROPERTIES OF BERYLLIUM GRADES IS-50M AND O-30-H
- Mr. Ivan LYATUN
- Mr. Ivan LYATUN (X-Ray Coherent Optics Laboratory (IKBFU))
X-ray refractive lenses [1-3] are widely used as beam transport and beam conditioning optics at the new generation synchrotron radiation sources. In order to extend their use for microscopy applications the significant improvements of the optical properties in terms of shape quality and bulk homogeneity are needed. It turned out that beryllium, as a low-Z element, is the most suitable for lens manufacturing. However, beryllium being a sintered material has an internal grain structure with a relatively high content of the beryllium oxide, which create a strong small- and ultra-small angular scattering. In this work we report results of study of different types of beryllium (Materion Brush and Russian ROSATOM grades) using small angle scattering and phase contrast imaging techniques. It was shown that Be with a reduced oxygen content is preferable for microbeam applications. As for the full-field microscopy, Be with small grain sizes is required. In this view a so-called “nano-beyllium” with grain sizes smaller than 50 nm is very promising for lens manufactuiring.
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