Erko, A.

Paper	Title	Page
FRAAU04	A New Generation of X-Ray Optics Based on Pyrolytic Graphite	798
	H. Legall, H. Stiel MBI, Berlin A. Antonov, I. Grigorieva Optigraph GmbH, Berlin V. Arkadiev IAP, Berlin A. Bjeoumikhov IfG, Berlin A. Erko BESSY GmbH, Berlin
	Highly Oriented Pyrolytic Graphite (HOPG) is a mosaic crystal, which consists of a large number of small nearly perfect crystallites. The unique structure of HOPG crystals enables them to be highly efficient in an energy range between 2 keV up to several 10 keV. The mosaicity of the crystal is responsible for the dramatic increase of integral reflectivity in comparison to perfect crystals. Furthermore thin HOPG crystal films can be easily bent and exhibit a very high thermal conductivity making them interesting for application in experiments with high average power x-ray sources. For application in x-ray spectroscopy the achievable spectral resolution of the crystal optics is in particular of interest. Recently performed measurements with very low foil thickness have revealed a spectral resolution of E/DeltaE=2900 in 004-reflection (H. Legall et al., Opt. Expr. 14 (2006)). This is by far the highest spectral resolution reported for HOPG crystals. The integral reflectivity of these films is still comparable to that of ideal Ge crystals. In the present work we will present new results concerning the energy resolution, integral reflectivity and application of thin bent Graphite films.
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