Spherical crystal cosmic X-ray spectrometer

Details Spherical crystal cosmic X-ray spectrometer Spherical crystal cosmic X-ray spectrometer

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30..607s&link_type=abstract

(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie

Physics

Optics

6

Cosmic Rays, Satellite-Borne Instruments, Spaceborne Telescopes, Spectrometers, Spectroscopic Telescopes, X Ray Spectroscopy, Astronomical Spectroscopy, Crystal Optics, Focal Plane Devices, Grazing Incidence, Grazing Incidence Telescopes, Plasma Diagnostics, Radiant Flux Density, Satellite Rotation, Spatial Resolution, Spectral Resolution, Systems Engineering, X Ray Sources

Scientific paper

It is shown that, for spectral studies at energies of approximately 3 keV (higher than those usually neglected by grazing incidence telescopes with high efficiency), freestanding, self-focusing crystal arrays offer the most practical way to achieve adequate sensitivity through concentration. Spectrometers of this type can be designed for the entire range of energies that can be diffracted by crystals (approximately 500 eV to 10,000 eV); for energies below 3 keV, they can have sensitivities greater than or comparable to that of instruments at the focal plane of a large telescope. It is noted that the concave spherical surface provides the only diffraction geometry which is preserved under all spacecraft rotations. This minimizes the loss of spectral and/or spatial resolution which may arise from source extent and spacecraft pointing and/or alignment errors.

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