Experimental Validation of an End-to-End Simulation Framework for Cd(Zn)Te-Based X-Ray and Gamma-Ray Imaging Spectrometers

Le résumé fourni par la source

With growing demand for high-resolution X-ray and gamma-ray detectors in astrophysical and medical applications, segmented$\text{Cd}(\text{Zn}) \text{Te}$sensors have emerged as a promising technology. Their performance is impacted by complex physical effects such as charge loss and anisotropic transport, which are difficult to accurately simulate with conventional tools. Yet, reliable modeling of these phenomena is critical for designing and optimizing next-generation spectrometers. To address this challenge, we developed CadTool, a high-fidelity simulation framework dedicated to Cd(Zn)Te-based imaging spectrometers. Built upon detailed physical models, it simulates the entire detection chain, from photon interaction in the sensor to 3D charge transport, signal induction and electronic readout, incorporating experimentally derived parameters. CadTool was developed through a collaboration between two leading detector research laboratories. The framework was validated against data measured with two custom detectors featuring different electrode segmentations (pixelated and stripped) and readout schemes (single- and double-sided). By tuning key physical parameters, simulations successfully reproduced the measured energy spectra, spatial event distributions and charge sharing features for fine-pitch geometries. Ongoing developments include machine learning techniques to accelerate computationally intensive modules, as well as novel sensor material and geometries implementation.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.