HARPO: Gamma ray telescope and polarimeter in MeV-GeV range Philippe GROS LLR, École Polytechnique for the HARPO collaboration 04/12/2015 Atelier accéleration.

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Presentation transcript:

HARPO: Gamma ray telescope and polarimeter in MeV-GeV range Philippe GROS LLR, École Polytechnique for the HARPO collaboration 04/12/2015 Atelier accéleration de particules dans les sources astrophysiques de haute énergie IPAG, Grenoble

Motivation for a MeV-GeV telescope Working principles of the HARPO detector First results from polarised gamma ray beam 2015-12-04

Gamma source sensitivity 100keV-100MeV gap Disclaimer: this is a personal representation of estimations extracted from different presentations for illustrative purposes 2015-12-04

HARPO Demonstrator scintillators micromegas +GEM readout strips field cage 2015-12-04

Electronics Readout of strips AFTER electronics (developed at CEA for T2K experiment) Trigger PM readout with PARISROC chip (Omega) Micromegas signal read through preamp and CFD Trigger built with FPGA on PMm2 card 2015-12-04

TPC: photon conversion The incoming photon interacts with the gas and decays into an electron-positron pair γ 𝑍 + → 𝑒 + 𝑒 − 𝑍 + γ 𝑒 − → 𝑒 + 𝑒 − 𝑒 − 2015-12-04

TPC: Gas ionisation Ar++e- The electron and positron travel through the gas (mostly Argon) and ionises it, freeing many electrons and positive ions This takes a few nanoseconds 2015-12-04

TPC: Drift and Readout The electrons drift along the electric field in a few microseconds. The are amplified and read out on the readout plane 2015-12-04

Polarisation measurement φ The azimuthal angle φ is related to the polarisation direction 𝑑Γ 𝑑ϕ ∝1+Α𝑃cos 2 ϕ− ϕ 0 2015-12-04

Beam test Demonstrator built and tested in polarised photon beam in NewSUBARU, Japan 13 Energy points, 1.6 to 74MeV, ~60Mevents Laser gamma beam electron beam 2015-12-04

Events 2015-12-04

Events Nucleus recoil 2015-12-04

Events triplet conversion 2015-12-04

Reconstructed event 2015-12-04

Very preliminary results Ongoing analysis Effects of polarisation visible down to 11MeV Reconstruction needs improvement Large systematic effects low reconstruction efficiency No optimal fit yet 2015-12-04

Conclusions Many low energy gamma telescopes are being studied A gaseous tracker would give the best resolution Polarimetry in the pair regime is possible! 2015-12-04

Questions? The HARPO team 2015-12-04

Science case Blazar (most sources seen by Fermi) E spectrum described by both leptonic and hadronic models In gamma range Leptonic unpolarised Hadronic polarised example of HBL H. Zhang and M. Böttcher, A.P. J. 774, 18 (2013) 2015-12-04