24 July 2014 The use of laterally graded multilayer mirrors for soft X-ray polarimetry
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ABSTRACT We present continued development of laterally graded multilayer mirrors (LGMLs) for a telescope design capable of measuring linear X-ray polarization over a broad spectral band. The multilayer-coated mirrors are used as Bragg re ectors at the Brewster angle. By matching to the dispersion of a spectrometer, one may take advantage of high multilayer re ectivities and achieve modulation factors over 50% over the entire 0.2-0.8 keV band. In Phase II of the polarimetry beam-line development, we demonstrated that the system provides 100% polarized X-rays at 0.525 keV (Marshall et al. 2013). Here, we present results from phase III of our development, where a LGML is used at the source and laterally manipulated in order to select and polarize X-rays from emission lines for a variety of source anodes. The beam-line will then provide the capability to test polarimeter components across the 0.15-0.70 keV band. We also present plans for a suborbital rocket experiment designed to detect a polarization level of better than 10% for an active galactic nucleus.
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Herman L. Marshall, Herman L. Marshall, Norbert S. Schulz, Norbert S. Schulz, David L. Windt, David L. Windt, Eric M. Gullikson, Eric M. Gullikson, Eric Blake, Eric Blake, Dan Getty, Dan Getty, Zane McInturff, Zane McInturff, } "The use of laterally graded multilayer mirrors for soft X-ray polarimetry", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91441K (24 July 2014); doi: 10.1117/12.2057003; https://doi.org/10.1117/12.2057003


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