15 July 2008 Polarimetry with a soft x-ray spectrometer
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An approach for measuring linear X-ray polarization over a broad-band using conventional spectroscopic optics is described. A set of multilayer-coated flats reflect the dispersed X-rays to the instrument detectors. The intensity variation as a function of energy and position angle is measured to determine three Stokes parameters: I, Q, and U. By laterally grading the multilayer optics and matching the dispersion of the gratings, one may take advantage of high multilayer reflectivities and achieve modulation factors over 80% over the entire 0.2 to 0.8 keV band. A sample design is shown that could be used with a small orbiting mission.
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Herman L. Marshall, Herman L. Marshall, } "Polarimetry with a soft x-ray spectrometer", Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 701129 (15 July 2008); doi: 10.1117/12.787249; https://doi.org/10.1117/12.787249


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