Performance of Newly Developed Hard X-Ray Polarimeter with Multianode PMT

We designed a Compton scattering type polarimeter using a multianode photomultiplier and segmented scintillators. Though optical cross talk for the multianode photomultiplier is observed, we succeeded in much reducing the affection. Considering results of basic experiments, we carried out computer simulations to estimate the basic performance of the polarimter. We recognized that the polarimeter can obtain the modulation factor of 48 % and the detection efficiency of ∼13 % in the energy range between 40 keV and 300 keV.