Physics – Optics
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.3113..369r&link_type=abstract
Conference Paper, SPIE Proceedings, Vol. 3113, p. 369-377.
Physics
Optics
X Ray Astronomy, Light Transmission, X Ray Optics, Optical Fibers, X Ray Spectroscopy, Photon Density, Mathematical Models, Glass, Surface Roughness, Error Analysis, Synchrotron Radiation
Scientific paper
Polycapillary X-ray optics, which is comprised of bundles of tens of thousands to millions of hollow glass capillary tubes, can be used as concentrators of astronomical X-rays for spectroscopic studies. Measurements have been performed of transmission efficiency of straight polycapillary fibers in the range of 10-80 keV. A geometrical optics simulation has been developed which accurately models experimental results and includes the effects of surface roughness and profile error. An optic designed for 8-keV photons has been tested as a concentrator for parallel beam synchrotron radiation. The results, a factor of 65 in intensity gain, are in good agreement with optics simulation. A prototype optic designed for 10-50 keV is currently under construction with a predicted gain of more than 100. Design requirements for higher energy photons are considered. By using a small or position sensitive detector, improvements of two orders of magnitude at 80 keV are expected from the use of this type of collector.
Gibson Winifred
Gubarev Mikhail
Hofmann F. A.
Joy Marhshall
MacDonald Carolyn A.
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