Polycapillaries and x-ray lens performances in order to improve conventional radiography experiments

Details Polycapillaries and x-ray lens performances in order to improve conventional radiography experiments Polycapillaries and x-ray lens performances in order to improve conventional radiography experiments

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.3115..311b&link_type=abstract

Proc. SPIE Vol. 3115, p. 311-322, Hard X-Ray and Gamma-Ray Detector Physics, Optics, and Applications, Richard B. Hoover; F. Pat

Physics

Optics

Scientific paper

The goal of polycapillaries and Kumakhov lens study is to bring out possible and liable ameliorations in terms of spatial resolution, brightness and spectral discrimination to a flash radiography chain used to image moving objects. Different kinds of polycapillaries have been tested with an x ray tube and a synchrotron beamline (DCI/LURE), in order to determine the performances of each type and highlight principal parameters which influence transmission and divergence. This report presents theoretical and experimental methods used to characterize polycapillaries and Kumakhov lens. The energy range studied is 10 to 50 keV. Tested polycapillaries are 5 to 20 cm in length. The number of capillaries inside the polycapillaries is: 550, 1250, and 2700. Various profiles have been checked: linear, circular arc curvatures, double circular arc curvatures and cubic curvatures. The transmission measurement is carried out either with a germanium diode or through fluorescence on a metallic foil. The divergence is analyzed either by photosensitive plate or by an x ray camera. Kumakhov lenses are tested in the same way. The knowledge of polycapillaries characteristics allows us to design future collection of polycapillaries (lens) to satisfy restraint, dimensions, positioning in radiography experiment.

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