Evaluation of Timepix3 with a 1 mm thick silicon sensor as a Compton imaging polarimeter in the hard X-ray band

The present work demonstrates the usage of a Timepix3 with a 1 mm thick silicon sensor as a scattering polarimeter with simultaneous Compton-camera imaging. For this purpose, laboratory experiments were designed where the detector was placed at different scattering angles with respect to a plastic target that is irradiated with X-rays from a Hamamatsu microfocus tube (tube voltage 75 kV, tube current 60 mu A). Photons scattered in the target at 90 degrees are almost 100 % linearly polarized. Measurements in an energy range of 32.5-67.5 keV showed modulation factors above 70%. Simulations of 100% linearly polarized beams showed modulation factors mu (100) > 77 % in energy range of 45-80 keV. The efficiency of detection has a maximum above 0.13 % at 45-50 keV. implemented the origin ensemble with resolution recovery (OE-RR) algorithm for Compton camera imaging. The full width at half maximum (FWHM) of the image of 16-21 degrees was achieved.