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X-Ray Imaging (0.1 arcsec at 6.7 keV) and HXR Polarimetry (10 – 50 keV)

X-Ray Imaging (0.1 arcsec at 6.7 keV) and HXR Polarimetry (10 – 50 keV). Brian Dennis NASA/GSFC. Focusing X-rays. Zone Plate Phase Zone Plate Phase Fresnel Lens e < 10.1% e < 40.4% e< 100%. G.K.Skinner. Phase Fresnel Lens.

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X-Ray Imaging (0.1 arcsec at 6.7 keV) and HXR Polarimetry (10 – 50 keV)

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  1. X-Ray Imaging (0.1 arcsec at 6.7 keV)andHXR Polarimetry(10 – 50 keV) Brian Dennis NASA/GSFC

  2. Focusing X-rays Zone Plate Phase Zone Plate Phase Fresnel Lens e < 10.1% e < 40.4% e<100% G.K.Skinner

  3. Phase Fresnel Lens Focal length is a function of photon energy

  4. 1 2 4 6 8 GOES M2.8 Flare DEM = 0.36 1049 (T/2keV)-0.72 cm-3 keV-1 Fe abundance = 2.0 x photospheric Ca – 4.7 x photospheric S – 0.4 x coronal Si – 0.2 x coronal

  5. Fresnel lens(es) or PZPs eg 1-2 cm dia Fresnel lens or PZPs eg 1-2 cm dia CCD array(s) eg 100 mm CCD array eg 100 mm • Phase Fresnel Lens – a possible design concept 50-100 m boom or formation flying Angular resolution ~ 0.1 arc sec Field of view ~ few arc mins Effective area ~ 1 cm2 (in a line)

  6. Hard X-ray Imaging Polarimetry • Energy range ~2 – ~50 keV • Complements Compton scattering polarimetry >50 keV • Photoelectron track imaging • Time Projection Chamber (TPC) • Goddard development • Gas Electron Multiplier (GEM) with strip readout • 70%/30% mixture of argon and dimethyl ether (DME) • 2-D positional information – strip number & time • Modulation collimators for Fourier-transform imaging • Leverage off GEMS SMEX for astrophysics • Italians developing direct 2-D capability • Focusing optics for direct imaging polarimetry

  7. Time Projection ChamberPolarimeter

  8. Effective Area vs. Energy Time Projection Chamber

  9. Imaging Polarimeter Concept

  10. The End

  11. Lens Parametersto focus 6.7 keV X-rays

  12. X-ray Imaging Requirements

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