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Proceedings Article

A soft x-ray polarimeter designed for broadband x-ray telescopes

[+] Author Affiliations
Herman L. Marshall

MIT Kavli Institute

Proc. SPIE 6688, Optics for EUV, X-Ray, and Gamma-Ray Astronomy III, 66880Z (September 20, 2007); doi:10.1117/12.746957
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From Conference Volume 6688

  • Optics for EUV, X-Ray, and Gamma-Ray Astronomy III
  • Stephen L. O'Dell; Giovanni Pareschi
  • San Diego, CA | August 26, 2007

abstract

A novel approach for measuring linear X-ray polarization over a broad-band using conventional imaging optics and cameras is described. A new type of high efficiency grating, called the critical angle transmission grating is used to disperse soft X-rays radially from the telescope axis. A set of multilayer-coated paraboloids re-image the dispersed X-rays to rings in the focal plane. The intensity variation around these rings 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 50% over the entire 0.2 to 0.8 keV band. A sample design is shown that could be used with the Constellation-X optics.

© (2007) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Herman L. Marshall
"A soft x-ray polarimeter designed for broadband x-ray telescopes", Proc. SPIE 6688, Optics for EUV, X-Ray, and Gamma-Ray Astronomy III, 66880Z (September 20, 2007); doi:10.1117/12.746957; http://dx.doi.org/10.1117/12.746957


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