Quasi-mosaic Crystals For High-resolution Focusing Of Hard X-rays Through A Laue Lens

Details Quasi-mosaic Crystals For High-resolution Focusing Of Hard X-rays Through A Laue Lens Quasi-mosaic Crystals For High-resolution Focusing Of Hard X-rays Through A Laue Lens

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011xau5.confe..11c&link_type=abstract

"The Second Ferrara Workshop on "X-ray Astrophysics up to 511 keV", held in Ferrara (Italy), September 14 - 16, 2011, article #1

Astronomy and Astrophysics

Astrophysics

Scientific paper

We propose the usage of bent crystals exploiting the Quasi-Mosaicity for high-resolution focusing of hard X-rays. Quasi-Mosaicity is an effect of anisotropy in crystals that manifests itself along selected crystallographic directions. As a result of primary curvature imparted to the crystal, a secondary curvature (Quasi-Mosaic curvature) occurs. We demonstrated that a combination of primary and Quasi-Mosaic curvatures allows high-efficiency diffraction and high-resolution focusing of diffracted photons. As compared to traditional mosaic crystals with same size and energy passband, Quasi-Mosaic crystals would increases the signal-to-noise ratio by about an order of magnitude and no mosaic defocusing would occur.

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