Towards an asynchronously operating hybrid photon detector based on the Timepix readout chip

Hybrid photon detectors equipped with a photocathode and a pixelated anode allow for spatially resolved photo-detection. We present the concept of an asynchronously operating, trigger-free hybrid photon detector with integrated digitization electronics. The front-end electronics is based on the Timepix detector that was developed in the Medipix collaboration. Results from experiments with the Timepix detector exposed to photoelectrons, and from GEANT4 simulations are used to optimize the detector design.