HARPO, a gas TPC active target for high-performance $\gamma$-ray astronomy; demonstration of the polarimetry of MeV $\gamma$-rays converting to $e^{+}{e}^{-}$ pair

Abstract

No $\gamma$-ray polarimeter sensitive above 1 MeV has ever flown space. $\gamma$-ray polarimetry would be a new window on the radiative processes at work in cosmic sources, processes that produce linearly polarised emission, each of which with different polarisation fractions. The HARPO Collaboration has designed, built and characterised on beam a gas-TPC active target with which we have demonstrated for the first time the polarimetry of a linearly polarised MeV $\gamma$-ray beam, from the analysis of the conversions to $e^{+}{e}^{-}$ pairs.

Presented at PM2018, 14th Pisa Meeting on advanced detectors, 27 May - 02 June 2018, Isola d'Elba, Italy

References in corpus (9)

• Multiwavelength Polarization of Rotation-Powered Pulsars
• Performance measurement of HARPO: a Time Projection Chamber as a gamma-ray telescope and polarimeter
• $\gamma$-ray polarimetry with conversions to $e^{+}{e}^{-}$ pairs: polarization asymmetry and the way to measure it
• Constraining axion by polarized prompt emission from gamma ray bursts
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Cited by in corpus (5)

• Gamma-Ray Polarimetry
• Telescope Concepts in Gamma-Ray Astronomy
• MeV-GeV Polarimetry with $\gamma \to e^{+}{e}^{-}$: Asserting the Performance of Silicon Strip Detectors-Based Telescopes
• Time projection chambers for gamma-ray astronomy
• A 5D, polarised, Bethe-Heitler event generator for $\gamma \to {\mu }^{+}{\mu }^{-}$ conversion