Herman L. Marshall,1 Alan Garner,1 Sarah N. Heine,1 Norbert S. Schulz,1 Ralf K. Heilmann,1 Brian Ramsey,2 David L. Windt3
1MIT Kavli Institute for Astrophysics and Space Research (United States) 2NASA Marshall Space Flight Ctr. (United States) 3Reflective X-Ray Optics LLC (United States)
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The Rocket Experiment Demonstration of a Soft X-ray Polarimeter (REDSoX Polarimeter) is a sounding rocket instrument that can make the first measurement of the linear X-ray polarization of an extragalactic source in the 0.2-0.5 keV band as low as 10%. We employ multilayer-coated mirrors as Bragg reflectors at the Brewster angle. By matching the dispersion of a dispersive spectrometer using critical angle transmission gratings to three laterally graded multilayer mirrors (LGMLs), we achieve polarization modulation factors over 90%. We will describe new prototyping work as well as extensions of the design for an orbital version.
This work was supported in part by NASA grants NNX15AL14G and NNX17AE11G to develop the design for a soft X-ray polarimeter.
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Herman L. Marshall, Alan Garner, Sarah N. Heine, Norbert S. Schulz, Ralf K. Heilmann, Brian Ramsey, David L. Windt, "Soft x-ray polarimetry with the REDSoX Polarimeter and beyond (Conference Presentation)," Proc. SPIE 11118, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXI, 111180A (9 September 2019); https://doi.org/10.1117/12.2529546