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The Hard X-ray Polarimeter X-Calibur - Design and Tests

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arxiv 1109.6850 v1 pith:EB7AWC4U submitted 2011-09-30 astro-ph.HE

The Hard X-ray Polarimeter X-Calibur - Design and Tests

M. Beilicke , W.R. Binns , J. Buckley , R. Cowsik , P. Dowkontt , A. Garson , Q. Guo , M.H. Israel
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K. Lee H. Krawczynski M.G. Baring S. Barthelmy T. Okajima J. Schnittman J. Tueller Y. Haba H. Kunieda H. Matsumoto T. Miyazawa K. Tamura
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keywords x-caliburx-rayhardcomptonpolarimeterachievesactiveassembly
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X-ray polarimetry promises to give new information about high-energy astrophysical sources, such as binary black hole systems, micro-quasars, active galactic nuclei, and gamma-ray bursts. We designed, built and tested a hard X-ray polarimeter X-Calibur to be used in the focal plane of the InFOCuS grazing incidence hard X-ray telescope. X-Calibur combines a low-Z Compton scatterer with a CZT detector assembly to measure the polarization of 10-80 keV X-rays making use of the fact that polarized photons Compton scatter preferentially perpendicular to the electric field orientation. X-Calibur achieves a high detection efficiency of order unity.

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