Focusing properties of mosaic crystals

被引：29

作者：

del Río, MS ^{[1
]}

Gambaccini, M ^{[1
]}

Pareschi, G ^{[1
]}

Taibi, A ^{[1
]}

Tuffanelli, A ^{[1
]}

Freund, A ^{[1
]}

机构：

[1] European Synchrotron Radiat Facil, F-38043 Grenoble, France

来源：

CRYSTAL AND MULTILAYER OPTICS | 1998年 / 3448卷

关键词：

mosaic crystals; Highly Oriented Pyrolytic Graphite (HOPG); x-ray focusing; secondary extinction;

D O I：

10.1117/12.332512

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页码：246 / 255

页数：10

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