Copper Mosaic Crystals for Laue Lenses |
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| Authors: | P Courtois K H Andersen P Bastie |
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| Institution: | (1) Institut Laue Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France;(2) Laboratoire de Spectrométrie Physique de Grenoble, UMR 5588 du CNRS, Université Joseph Fourier, GrenobleI, BP 87, 38402 Saint Martin d'Hères cedex, France |
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| Abstract: | Large single crystals of copper with an uniform and very narrow mosaic spread between 25 seconds and 1 minute of arc are now available at I.L.L. This result is of great interest in the construction of a Laue lens for astrophysical applications for which such quality copper single crystals may be used. The X-ray diffraction properties of copper single crystals produced at I.L.L. were studied for x-ray energies ranging from 100 keV to 400 keV. Several monocrystalline plates with different thicknesses and mosaic distributions were then prepared from the as-grown crystals in order to measure their diffraction efficiency as a function of energy. As expected, the value of the peak reflectivity depends on the crystal thickness. Reflectivity measurements show the excellent properties of copper crystals for gamma-ray diffraction. A peak reflectivity of 24% was measured at 220 keV from a copper single crystal of 3.75 mm thickness having a mosaic spread of 1.5 minutes of arc. Some technical aspects on the preparation of copper single crystal plates are also discussed. |
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| Keywords: | Copper crystal growth mosaic crystal lens X-ray diffraction reflectivity |
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