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1 February 1991 Bragg crystal polarimeter for the Spectrum-X-Gamma misson
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Abstract
We are designing a Bragg crystal polarimeter for the focal plane of the SODART telescope on the Spectrum-XGamma mission. A mosaic graphite crystal will be oriented at 45 0 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 defmed 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 50 jtm thick to allow x-rays with energies □ 4 keV 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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jeff Holley, Eric H. Silver, Klaus Ziock, Robert Novick, Philip E. Kaaret, Martin C. Weisskopf, Ronald F. Elsner, and Jeffrey W. Beeman "Bragg crystal polarimeter for the Spectrum-X-Gamma misson", Proc. SPIE 1343, X-Ray/EUV Optics for Astronomy, Microscopy, Polarimetry, and Projection Lithography, (1 February 1991); https://doi.org/10.1117/12.23219
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