Pulse-shape calculations and applications using the AGATAGeFEM software package

TL;DR

The paper introduces AGATAGeFEM, a software tool for modeling segmented germanium detectors, detailing its methods and demonstrating its effectiveness in improving pulse-shape analysis accuracy.

Contribution

It presents a new software package for detailed modeling of germanium detectors, including geometry, electric fields, and charge transport, with improved pulse-shape data for experimental analysis.

Findings

Crosstalk has minor impact on position resolution.

Pulse-shape sensitivity varies with detector position.

New pulse-shape database improves analysis results.

Abstract

A software package for modeling segmented High-Purity Segmented Germanium detectors, AGATAGeFEM, is presented. The choices made for geometry implementation and the calculations of the electric and weighting fields are discussed. Models used for charge-carrier velocities are described. Numerical integration of the charge-carrier transport equation is explained. Impact of noise and crosstalk on the achieved position resolution in AGATA detectors are investigated. The results suggest that crosstalk as seen in the AGATA detectors is of minor importance for the position resolution. The sensitivity of the pulse shapes to the parameters in the pulse-shape calculations is determined, this as a function of position in the detectors. Finally, AGATAGeFEM has been used to produce pulse-shape data bases for pulse-shape analyses of experimental data. The results with the new data base indicate improvement with respect to those with the standard AGATA data base.