Evaluation of Chromium Compensated Gallium Arsenide Sensors Using Timepix1, Timepix3, Medipix3 and Timepix2 Readout Electronics

This work summarizes the evaluation results of chromium compensated GaAs sensors manufactured by Advacam Oy and evaluated with four different photon counting readout electronics. Flip chip bonded assemblies were evaluated to study the optimal sensor design and bias voltage; uniformity; sensor stability; energy resolution; Modulation Transfer Function (MTF) and high X-ray flux operation. The presentation summarizes the GaAs performance results received from the contributing authors. It presents analytical comparisons to the other commercially available GaAs sensor material in terms of uniformity and spectral resolution. Advacam's GaAs present better uniformity and similar or better energy resolution. The presentation concludes that it is possible to manufacture radiation sensors of chromium compensated GaAs with high uniformity and a good energy resolution that can operate at high X-ray fluxes.