A Pair Production Telescope for Medium-Energy Gamma-Ray Polarimetry
2014
Abstract We describe the science motivation and development of a pair production telescope for medium-energy (∼5–200 MeV) gamma-ray polarimetry. Our instrument concept, the Advanced Energetic Pair Telescope (AdEPT), takes advantage of the Three-Dimensional Track Imager, a low-density gaseous time projection chamber, to achieve angular resolution within a factor of two of the pair production kinematics limit (∼0.6° at 70 MeV), continuum sensitivity comparable with the Fermi-LAT front detector ( −6 MeV cm −2 s −1 at 70 MeV), and minimum detectable polarization less than 10% for a 10 mCrab source in 10 6 s.
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