Bent Crystals By Superficial Grooves For High-efficiency Concentration Of Hard X-ray Photons By A Laue Lens

Details Bent Crystals By Superficial Grooves For High-efficiency Concentration Of Hard X-ray Photons By A Laue Lens Bent Crystals By Superficial Grooves For High-efficiency Concentration Of Hard X-ray Photons By A Laue Lens

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011xau5.confe..28g&link_type=abstract

"The Second Ferrara Workshop on "X-ray Astrophysics up to 511 keV", held in Ferrara (Italy), September 14 - 16, 2011, article #2

Astronomy and Astrophysics

Astrophysics

Scientific paper

We propose a technique to fabricate self-standing curved crystals for high-efficiency concentration of hard X-ray photons by a Laue lens. This technique relies on superficial grooves on a mono- crystal by a diamond saw. Extension of the method to materials with higher atomic number, e.g., Ge, has been undertaken to provide high-efficiency diffraction up to 800 keV. With respect to other proposed techniques, the method of indentations is cheap, simple and reproducible, being based on mass production tools. It is possible to use curved crystal in two different geometries. Employing the ``geometry one'', it is possible to exploit the curvature directly imparted to the crystal to achieve high-efficiency diffraction. Grooved Si crystals were characterized in this geometry at ESRF and efficiently diffracted up to 500 keV, peaking 95% at 150 keV. The ``geometry two'' consists in exploiting the so-called quasi-mosaicity to obtain high-resolution focusing of X-rays. 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. Quasi-Mosaic crystals would increases the signal-to-noise ratio of about one orders of magnitude with respect to mosaic crystals and no mosaic defocusing would occur.

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