Performance evaluation of PSD for silicon ECAL

TL;DR

This study evaluates the performance of position sensitive silicon detectors (PSD) for improving the spatial resolution of electromagnetic calorimeters in particle detectors, through laser irradiation and particle source experiments.

Contribution

It demonstrates that high resistance in the p+ layer enhances position reconstruction accuracy in PSDs for ECAL applications.

Findings

High resistance p+ layer improves position reconstruction.

Laser and particle source tests confirm effective position detection.

Potential for improved ECAL spatial resolution.

Abstract

We are developing position sensitive silicon detectors (PSD) which have an electrode at each of four corners so that the incident position of a charged particle can be obtained using signals from the electrodes. It is expected that the position resolution the electromagnetic calorimeter (ECAL) of the ILD detector will be improved by introducing PSD into the detection layers. In this study, we irradiated collimated laser beams to the surface of the PSD, varying the incident position. We found that the incident position can be well reconstructed from the signals if high resistance is implemented in the p+ layer. We also tried to observe the signal of particles by placing a radiative source on the PSD sensor.