Study on 2D interpolating readout for GEM detector

The two-dimensional interpolating readout, a new readout concept based on resistive anode structure, was studied for the micro-pattern gaseous detector. Within its high spatial resolution, the interpolating resistive readout structure leads to an enormous reduction of electronic channels compared with pure pixel devices, and reduces the cost of the detector. A GEM (gaseous electron multiplier) detector with 2D interpolating resistive readout structure was set up and the performance of the detector was studied with ⁵⁵Fe 5.9 keV X-ray. The 2D position reconstruction algorithms of interpolating readout were developed. The results show that an energy resolution of about 19%, and a spatial resolution of about 219 μm (FWHM) of the detector were reached, and the detector also had a good imaging performance. (authors)