Efficiency and resolution measurements of X-ray transmission gratings between 7.1 and 304 A

Details Efficiency and resolution measurements of X-ray transmission gratings between 7.1 and 304 A Efficiency and resolution measurements of X-ray transmission gratings between 7.1 and 304 A

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apopt..19.1601b&link_type=abstract

Applied Optics, vol. 19, May 15, 1980, p. 1601-1605.

Astronomy and Astrophysics

Astronomy

15

Gratings (Spectra), Infrared Spectra, Satellite-Borne Instruments, Spectral Resolution, Transmission Efficiency, X Ray Astronomy, Astigmatism, Design Analysis, Exosat Satellite, Mirrors, Spaceborne Astronomy

Scientific paper

Efficiency and resolution measurements are reported of an X-ray transmission grating to be flown on board the European X-ray Observatory Satellite (EXOSAT). By optimizing the thickness of the grating bars, very high efficiencies can be obtained over a limited energy range. An absolute efficiency of 20% at 7.1 A decreasing to 10% above 15 A has been achieved, including all effects of support structure and mounting necessary to withstand qualification. This means that 10% of the incoming radiation at 7.1 A results in the minus first spectral order and 10% in the plus first order. The measured resolution at the short wavelength end of the range (wavelength less than 20 A) is determined by the mirror resolution; at the longer wavelengths (300 A), the effects of coma and astigmatism dominate. The measured resolution at 304 A for the EXOSAT-mirror-grating system is 4.5 A in agreement with theoretical predictions.

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