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Proceedings Paper

Alignment procedure and divergence behavior in capillary optics: first results with x-ray tubes and synchrotron radiation
Author(s): Giorgio Cappuccio; Sultan B. Dabagov
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Paper Abstract

Due to the low value of the critical angle, the main problem is using a polycapillary lens is to position it correctly with respect to the x-ray source. We have developed a recursive procedure for fast and precise alignment by means of a four-circle diffractometer and a Cu x-ray tube. After the alignment we observed the focusing effect on a fluorescent target and measured an increase of about 30 in the local density of the x-ray beam. During the experiments a sharp decrease in the beam divergence behind the capillary structures was also detected. This unexplained fact, already mentioned in the past by several reserachers, was explained for the first time by our group in the framework of the wave scattering theory. The same alignment procedure was successfully repeated using synchrotron radiation at the Elettra storgae ring at Trieste. The focal spot position was evaluated by a set of photo images. In the same experiment we also tested and evaluated the operating characteristics of a straight polycapillary lens.

Paper Details

Date Published: 30 July 2002
PDF: 5 pages
Proc. SPIE 4765, International Conference on X-ray and Neutron Capillary Optics, (30 July 2002); doi: 10.1117/12.489761
Show Author Affiliations
Giorgio Cappuccio, CNR/Istituto Nazionale di Fisica Nucleare and INFN/LNF (Italy)
Sultan B. Dabagov, INFN/LNF and P.N. Lebedev Physical Institute (Italy)

Published in SPIE Proceedings Vol. 4765:
International Conference on X-ray and Neutron Capillary Optics
Muradin A. Kumakhov, Editor(s)

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