A gas Time Projection Chamber can be used for gamma-ray astronomy with
excellent angular-precision and sensitivity to faint sources, and for
polarimetry, through the measurement of photon conversion to e+e− pairs. We
present the expected performance in simulations and the recent development of a
demonstrator for tests in a polarized photon beam.Comment: SPIE Astronomical Telescopes + Instrumentation, Ultraviolet to gamma
ray, Montr\'eal, Canada 2014. v2: note added in proof. Copyright 2014 SPIE.
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