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Curtis Odell explains about grazing incidence reflection. An
animation shows light rays passing through two sets of the
reflectors (seen in cross-section). The rays focus onto the detector. The
cross-section of the precollimator appears, with light rays that
are outside of the main beam not passing through the precollimator.
This animation ends with an overlay of the Astro-E2 satellite over
the mirror and detector.
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CURTIS: We use an X-ray telescope, which depends on a grazing incidence reflection, in which the reflectors are nearly edge on to the X-ray source. The X-ray beam hits the primary reflector, then hits the secondary reflector and then moves on to the detector about four and a half meters away. We add a pre-collimator, before the primary reflection, to block off axis X-rays.
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