Author/Authors :
Kanai، نويسنده , , Y. and Ueno، نويسنده , , M. and Kataoka، نويسنده , , J. and Arimoto، نويسنده , , M. and Kawai، نويسنده , , N. and Yamamoto، نويسنده , , K. and Mizuno، نويسنده , , T. and Fukazawa، نويسنده , , Y. and Kiss، نويسنده , , M. and Ylinen، نويسنده , , T. and Marini Bettolo، نويسنده , , C. and Carlson، نويسنده , , P. and Klamra، نويسنده , , Christopher W. Pleydell-Pearce، نويسنده , , M. and Chen، نويسنده , , P. and Craig، نويسنده , , B. and Kamae، نويسنده , , T. and Madejski، نويسنده , , G. and Ng، نويسنده , , J.S.T. and Rogers، نويسنده , , R. and Tajima، نويسنده , , H. and Thurston، نويسنده , , T.S. and Saito، نويسنده , , Y. and Takahashi، نويسنده , , T. and Gunji، نويسنده , , S. and Bjornsson، نويسنده , , C.-I. and Larsson، نويسنده , , S. and Ryde، نويسنده , , F. and Bogaert، نويسنده , , Parunag G. and Kishimoto، نويسنده , , S.، نويسنده ,
Abstract :
We report about the beam test on a prototype of the balloon-based astronomical soft gamma-ray polarimeter, PoGOLite (Polarized Gamma-ray Observer – Light Version) conducted at KEK Photon Factory, a synchrotron radiation facility in Japan. The synchrotron beam was set at 30, 50, and 70 keV and its polarization was monitored by a calibrated polarimeter. The goal of the experiment was to validate the flight design of the polarimeter. PoGOLite is designed to measure polarization by detecting a Compton scattering and the subsequent photo-absorption in an array of 217 well-type phoswich detector cells (PDCs). The test setup included a first flight model PDC and a front-end electronics to select and reconstruct valid Compton scattering events. The experiment has verified that the flight PDC can detect recoil electrons and select valid Compton scattering events down to 30 keV from background. The measure azimuthal modulations (34.4%, 35.8% and 37.2% at 30, 50, and 70 keV, respectively) agreed within 10% (relative) with the predictions by Geant4 implemented with dependence on the initial and final photon polarizations.
