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A gas Time Projection Chamber can be used for gamma-ray astronomy withexcellent angular-precision and sensitivity to faint sources, and forpolarimetry, through the measurement of photon conversion to $e^+e^-$ pairs. Wepresent the expected performance in simulations and the recent development of ademonstrator for tests in a polarized photon beam.

HARPO: a TPC as a gamma-ray telescope and polarimeter