First beam test results of the FORTIS sensor

We have obtained first results in a testbeam for the first 4T Monolithic Active Pixel Sensor for particle physics, FORTIS. We have measured a S/N of more than 100 for MIPs due to the excellent noise performance of the 4T architecture. Two versions of the sensor were tested; with and without deep Pwell areas in-pixel. The deep Pwell areas allow the incorporation of PMOS transistors inside the pixels signal charge loss. The presented results demonstrate that the deep Pwell sensors improve the performance.