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Description
CadTool is an open source simulation framework for x-ray and gamma-ray solid state detectors. The tool uses the SolidStateDetectors.jl library for the simulation of detector electric and weighting fields and implements a modified charge drift model to take into consideration initial charge cloud size, self-repulsion, charge trapping and thermal diffusion. The estimation of the initial charge cloud is done with the simulation of the electron paths inside a given detector material using GATE physics simulation tool. Considering charge dynamics and charge trapping probability we compute Charge Induction Efficiency maps for a 2x2 pixel area. The induced charge/current signals on the cathode and anode electrodes can also be extracted allowing the user to perform parameterization of the transient signals for new electronics design philosophy (ie:. subpixel localization, depth of interaction, timing requirements). To correlate the simulated detector response to real measurement we use GATE to obtain charge deposits on the detector volume according to tunable source geometries and experimental environment. Electronics readout logic models are also implemented to mimic real data acquisition systems (ie:. electronic noise, shaping time, ADC characteristics). The tool has been validated with real detectors operating <100 keV, pixel and double sided strip, and we are actively updating the physics models for the validation of keV - MeV detectors.