Description
The European Spallation Source (ESS) Test Beamline (TBL) will serve as a multi-purpose in-strument designed for early-stage performance evaluation of the accelerator and neutron source, as well as for testing, integration, and calibration of neutron detection instrumenta-tion. Among the detector technologies employed at TBL, position-sensitive He-3 tubes de-tector (LPSD) play a crucial role in characterizing the direct and transmitted neutron beams by imaging their spatial distribution and intensity. In this work, we present Geant4-based simulations of LPSD modules operated at two different gas pressures: 10 bar and 1 bar. Each module consists of four He-3 tubes. The simulation aims to evaluate the detector response and optimize beam reconstruction methods to mitigate the effects of tube separation on spatial resolution. At TBL, an accurate characterization of the incident and transmitted beam in terms of time structure, spatial resolution, and flux is essential for neutron scattering ex-periments. To achieve this, precise calibration and a deep understanding of the performance of He-3 detectors are required. Our simulations provide insights into beam reconstruction techniques, helping to enhance the reliability of neutron imaging at TBL.
