Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995opten..34.1512m&link_type=abstract
Optical Engineering 34(05), 1512-1523, Brian J. Thompson; Ed.
Astronomy and Astrophysics
Astronomy
Scientific paper
We describe a spectrometer used to evaluate curved crystals, crystals originally intended for cosmic x-ray spectroscopy on the AXAF satellite. The most important feature of the AXAF instrument was the high-resolution spectra ((lambda) /(Delta) (lambda) as high as 2000) that could be obtained from astronomical objects over the (lambda) range 1.2 to 100 angstroms. The crystals are formed into narrow cylindrical facets and assembled into a pseudo-toroidal surface. The spectral resolution is degraded by a number of effects, which we described. The primary effect over which we have control is the figure of each cylindrical segment. We measure deviations from the nominal cylindrical shape, which we call (Delta) (theta) slope, using a laboratory x-ray spectrometer. We present spectrometer data for several crystal samples, evaluated at different energies. We compare these results with similar tests performed at optical wavelengths. Our results indicate that the (Delta) (theta) slope error can be controlled, and that curved crystals with the desired resolving power can be fabricated.
Bauer James M.
Canizares Claude R.
Markert Thomas H.
Nelson Christie S.
Puc Bernard P.
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