Low-energy response of a prototype detector array for the PoGO astronomical hard x-ray polarimeter

J. Kataoka; Y. Kanai; M. Arimoto; T. Ikagawa; T. Saito; M. Ueno; N. Kawai; R. Blandford; P. Chen; T. Kamae; G. Madejski; T. Mizuno; J. Ng; H. Tajima; T. Thurston; L. Barbier; A. Harding; J. Krizmanic; S. Hunter; J. Mitchell; R. Streitmatter; E. Groth; R. Fernholtz; D. Marlow; Y. Saito; T. Takahashi; S. Gunji; H. Sakurai; Y. Fukazawa; V. Anderson; P. Carlson; W. Klamra; M. Pearce; M. Suhonen; S. Larsson; F. Ryde; C-I. Bjornsson; G. Bogaert; S. Kishimoto

doi:10.1117/12.613621

18 August 2005 Low energy response of a prototype detector array for the PoGO astronomical hard x-ray polarimeter

J. Kataoka, Y. Kanai, M. Arimoto, T. Ikagawa, T. Saito, M. Ueno, N. Kawai, R. Blandford, P. Chen, T. Kamae, G. Madejski, T. Mizuno, J. Ng, H. Tajima, T. Thurston, L. Barbier, A. Harding, J. Krizmanic, S. Hunter, J. Mitchell, R. Streitmatter, E. Groth, R. Fernholtz, D. Marlow, Y. Saito, T. Takahashi, S. Gunji, H. Sakurai, Y. Fukazawa, V. Anderson, P. Carlson, W. Klamra, M. Pearce, M. Suhonen, S. Larsson, F. Ryde, C-I. Bjornsson, G. Bogaert, S. Kishimoto

Author Affiliations +

Proceedings Volume 5898, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV; 58980J (2005) https://doi.org/10.1117/12.613621
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The Polarized Gamma-ray Observer (PoGO) is a new balloon-borne instrument designed to measure polarization from astrophysical objects in the 30-200 keV range. It is under development for the first flight anticipated in 2008. PoGO is designed to minimize the background by an improved phoswich configuration, which enables a detection of 10 % polarization in a 100 mCrab source in a 6--8 hour observation. To achieve such high sensitivity, low energy response of the detector is important because the source count rate is generally dominated by the lowest energy photons. We have developed new PMT assemblies specifically designed for PoGO to read-out weak scintillation light of one photoelectron (1 p.e.) level. A beam test of a prototype detector array was conducted at the KEK Photon Factory, Tsukuba in Japan. The experimental data confirm that PoGO can detect polarization of 80-85 % polarized beam down to 30 keV with a modulation factor 0.25 ± 0.05.

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J. Kataoka, Y. Kanai, M. Arimoto, T. Ikagawa, T. Saito, M. Ueno, N. Kawai, R. Blandford, P. Chen, T. Kamae, G. Madejski, T. Mizuno, J. Ng, H. Tajima, T. Thurston, L. Barbier, A. Harding, J. Krizmanic, S. Hunter, J. Mitchell, R. Streitmatter, E. Groth, R. Fernholtz, D. Marlow, Y. Saito, T. Takahashi, S. Gunji, H. Sakurai, Y. Fukazawa, V. Anderson, P. Carlson, W. Klamra, M. Pearce, M. Suhonen, S. Larsson, F. Ryde, C-I. Bjornsson, G. Bogaert, and S. Kishimoto "Low energy response of a prototype detector array for the PoGO astronomical hard x-ray polarimeter", Proc. SPIE 5898, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV, 58980J (18 August 2005); https://doi.org/10.1117/12.613621

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