Efficiency and resolution measurements of X-ray transmission gratings between 7.1 and 304 Å.
Abstract
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.
- Publication:
-
Applied Optics
- Pub Date:
- May 1980
- DOI:
- 10.1364/AO.19.001601
- Bibcode:
- 1980ApOpt..19.1601B
- Keywords:
-
- Gratings (Spectra);
- Infrared Spectra;
- Satellite-Borne Instruments;
- Spectral Resolution;
- Transmission Efficiency;
- X Ray Astronomy;
- Astigmatism;
- Design Analysis;
- Exosat Satellite;
- Mirrors;
- Spaceborne Astronomy;
- Astronomy;
- Gratings:X Rays