Bragg crystal polarimeter for the Spectrum-X-Gamma misson

Jeff Holley; Eric H. Silver; Klaus Ziock; Robert Novick; Philip E. Kaaret; Martin C. Weisskopf; Ronald F. Elsner; Jeffrey W. Beeman

doi:10.1117/12.23219

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1 February 1991 Bragg crystal polarimeter for the Spectrum-X-Gamma misson

Jeff Holley, Eric H. Silver, Klaus Ziock, Robert Novick, Philip E. Kaaret, Martin C. Weisskopf, Ronald F. Elsner, Jeffrey W. Beeman

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Proceedings Volume 1343, X-Ray/EUV Optics for Astronomy, Microscopy, Polarimetry, and Projection Lithography; (1991) https://doi.org/10.1117/12.23219
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

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 &square; 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.

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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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