Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1343..500h&link_type=abstract
IN: X-ray/EUV optics for astronomy, microscopy, polarimetry, and projection lithography; Proceedings of the Meeting, San Diego,
Astronomy and Astrophysics
Astronomy
Bragg Cells, Crystal Structure, Graphite, Polarimeters, Satellite-Borne Instruments, X Ray Telescopes, Focal Plane Devices, Lithium, Thomson Scattering, Wave Reflection, X Ray Astronomy, X Ray Spectra
Scientific paper
A Bragg crystal polarimeter for the focal plane of the SODART telescope on the Spectrum-X-Gamma mission is being designed. A mosaic graphite crystal will be oriented at 45 deg to the optic axis of the telescope, thereby preferentially reflecting those X-rays which satisfy the Bragg condition and have electric vectors that are perpendicular to the plane defined by the incident and reflected photons. The reflected X-rays will be detected by an imaging proportional counter with the image providing direct X-ray aspect information. The crystal will be about 50 microns thick to allow X-rays with energies of 4 keV or greater to be transmitted to a lithium block mounted below the graphite. The lithium is used to measure the polarization of these high energy X-rays by exploiting the polarization dependence of Thomson scattering. The development of thin mosaic graphite crystals is discussed and recent reflectivity, transmission, and uniformity measurements are presented.
Beeman Jeff
Elsner Ronald
Holley Julian
Kaaret Phil
Novick Robert
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