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The properties of a polarimeter using reflection at a Bragg angle of 45 are discussed and applied to the design of a rocket payload for determining the polarization of x rays from celestial sources. Small detector areas are accomplished through the use of torroidally bent crystals to focus the x rays. This device will detect polarizations of as small as a few percent from sources such as Sco XR-1 and the Crab Nebula. With slight modifications, this device can also be used to obtain polarization images of x-ray sources, and also to obtain a spectrum of polarization as a function of energy.
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Schnopper et al. (1969) studied this question.
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