Physics – Optics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3448..246s&link_type=abstract
Proc. SPIE Vol. 3448, p. 246-255, Crystal and Multilayer Optics, Albert T. Macrander; Andreas K. Freund; Tetsuya Ishikawa; Denni
Physics
Optics
4
Scientific paper
X-ray instruments with mosaic crystals are proposed and used in many applications in synchrotron radiation, medical physics and astrophysics. These crystals present a parafocusing of the x-ray beam in the diffraction plane, which is thoroughly analyzed in this paper. We studied the evolution of the cross- section of the diffracted beam, using several samples of Highly Oriented Pyrolythic Graphite crystals coming from different suppliers. The experiment has been performed at the European Synchrotron Radiation Facility (beamline BM5). The results clearly show a parafocusing effect in the 1:1 magnification ratio along the diffraction plane and a defocusing effect along the perpendicular plane. The secondary extinction coefficient is also measured.
Freund Andreas K.
Gambaccini Mauro
Pareschi Giovanni
Sanchez del Rio Manuel
Taibi Angelo
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