22-26 May 2017
Temple University - Philadelphia
US/Eastern timezone

HARPO, a Micromegas+GEM TPC for gamma polarimetry above 1 MeV.

May 22, 2017, 1:40 PM
Morgan Hall D301 (Temple University - Philadelphia)

Morgan Hall D301

Temple University - Philadelphia

Morgan Hall, 1398 Cecil B. Moore Ave., Philadelphia, PA 19122, USA


Paul Colas (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR))


Gamma-ray Compton telescopes lack sensitivity above 1 MeV and polarimetry is hampered by multiple scattering in calorimetric telescopes below 100 MeV. To fill the gap and use pair creation between 1 and a few tens of MeV, a high-pressure Argon TPC was proposed as a gamma-ray detector. A (30 cm)^3 demonstrator read out by a hybrid Micromegas+GEM has been built and exposed to polarized photon beams at the NewSUBARU facility in Japan. A report on the operation and preliminary results on polarization asymmetry will be given. Before and after the beam test, the sealed detector operation has been monitored with cosmic rays during several months and the learning from this experience will be presented.

Primary author

Paul Colas (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR))

Presentation materials