Investigations into the impact of locally modified sensor architectures on the detection efficiency of silicon micro-strip sensors

TL;DR

This study investigates how local modifications in silicon micro-strip sensor architectures affect their detection efficiency, using detailed measurements in X-ray and particle beams to understand the influence of specific sensor features.

Contribution

It provides new insights into how sensor features like metal pads and p-stops impact the response regions of silicon strip sensors, informing future detector design improvements.

Findings

Sensor response varies with local sensor features.

Metal pads and p-stops influence the responding area.

Results aid in optimizing sensor architecture for better detection efficiency.

Abstract

The High Luminosity Upgrade of the LHC will require the replacement of the Inner Detector of ATLAS with the Inner Tracker (ITk) in order to cope with higher radiation levels and higher track densities. Prototype silicon strip detector modules are currently developed and their performance is studied in both particle test beams and X-ray beams. In previous test beam studies of prototype modules, silicon sensor strips were found to respond in regions varying from the strip pitch of 74.5 {\upmu}m. The variations have been linked to local features of the sensor architecture. This paper presents results of detailed sensor measurements in both X-ray and particle beams investigating the impact of sensor features (metal pads and p-stops) on the responding area of a sensor strip.