High diffraction efficiency with hard X-rays through a thick silicon crystal bent by carbon fiber deposition

Abstract

The diffraction capability of two crystalline silicon plates bent by carbon fiber deposition has been studied. The performed treatment induced a permanent curvature in the samples, resulting in an increase of the diffraction efficiency. The obtained efficiencies are constant over a wide angular range and close to the theoretical expectations, meaning that the curvatures were homogeneous. Most importantly, the bending technique allowed the manufacture of bent samples up to 5 mm thick and with a radius of curvature down to 30 m. With such a technique, the fabrication of crystals for the realization of a hard X-ray concentrator (Laue lens) for astrophysical purposes is enabled

Manufacturing of advanced bent crystals for Laue Optics for Gamma ObservationS (LOGOS)

“…The sample and the experimental set-up reported in this paper are the same as for the Sample 1 reported in [25]. However, the samples characteristics were not completely identical.…”

“…The deposition of thin films may be a viable technique to obtain self-standing bent crystals with a controlled and uniform curvature [25]. The curvature induced by film deposition is already wellknown in the electronics sector as a drawback of device manufacturing.…”

Design study of a Laue lens for nuclear medicine

“…Some promising results have been already achieved and further studies are under development (Camattari, Dolcini et al, 2014).…”

Hard x-ray broad band Laue lenses (80-600 keV): building methods and performances

“…An extremely uniform and highly reproducible curvature is achieved even if the grooves cause damage and fragility of the crystals 12 . Instead, a self-standing curvature is obtained by imem/cnr Parma by means of a controlled mechanical damaging of one surface of the sample 13 .…”