Polarization Measurements with the MEGA Telescope

Details Polarization Measurements with the MEGA Telescope Polarization Measurements with the MEGA Telescope

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.552..921z&link_type=abstract

Proceedings of the 5th INTEGRAL Workshop on the INTEGRAL Universe (ESA SP-552). 16-20 February 2004, Munich, Germany. Scientific

Astronomy and Astrophysics

Astronomy

Scientific paper

The tracking Medium Energy Gamma-ray Astronomy telescope MEGA, which detects gamma-rays via Compton scattering and pair creation, has been calibrated at the High Intensity Gamma Source of the Free Electron Laser facility at Duke University. Exposures to monoenergetic (range 710 keV to 50 MeV, dE/E < 2%), 100% linearly polarized pencil beams allow the derivation of the imaging and spectral properties, sensitivity and field of view of this prototype instrument. Since the gamma-ray test beam is generated by Compton back-scattering inside a free electron laser, the degree and angle of polarization are completely determined. We describe the measured response of MEGA to these polarized photons in the range below about 5 MeV, where Compton scattering is the dominant detection process. Key words: Compton telescope; polarization; gamma-ray astronomy.

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