Timepix4 spatial response characterization with X-ray monochromatic synchrotron beam

The Timepix4 is a readout ASIC developed by the Medipix4 collaboration, designed to work with various semiconductor sensors to form detection systems with 448×512 pixels with a pitch of 55 µm. Its ability to simultaneously measure the Time of Arrival (ToA) and the Time over Threshold (ToT) of the signal makes it particularly suitable for spectral imaging applications. The ToT allows to measure the hit's energy, while the ToA enables to cluster the acquired events, recomposing the signal of the detected photons. The ability to cluster events allows to limit the degradation of the detector's spatial response caused by charge sharing effects, a common issue that affect conventional single-photon-counting detectors. This work aims to characterize the spatial response of a Timepix4-based detection system, in terms of the Edge Spread Function (ESF) and Line Spread Function (LSF), using a monochromatic X-ray beam. The characterization was performed at different energies (10 keV and 20 keV) using the moving edge method; different clustering methods were applied and compared during the analysis.