Beam Test Performance of AstroPix sensor with 120 GeV protons

TL;DR

This paper reports beam test results of the AstroPix HV-CMOS sensor with 120 GeV protons, demonstrating its capability for precise beam profiling and energy deposit measurements relevant for future collider calorimeters.

Contribution

First beam test of AstroPix v3 sensor with high-energy protons, showcasing its application in particle tracking and calorimeter performance studies.

Findings

Accurate beam profile measurement using 500 um pixel pitch.

Effective depletion depth determined from minimum ionizing particles.

Validation of AstroPix sensor for high-energy particle detection.

Abstract

AstroPix is a high-voltage CMOS (HV-CMOS) monolithic active pixel sensor (MAPS) developed for precision gamma-ray imaging and spectroscopy in the medium energy regime, as well as for precise shower imaging and tracking in the Barrel Imaging Calorimeter (BIC) of the Electron Proton/Ion Collider (ePIC) detector at the future Electron-Ion Collider (EIC). We present beam test results of the AstroPix v3 sensor using a 120 GeV proton beam at the Fermilab Test Beam Facility (FTBF), performed as part of the broader experimental campaign for the BIC prototype calorimeter. The sensor's 500 um pixel pitch enabled precise measurement of the beam profile, providing important information for calorimeter performance studies. Using the measured 120 GeV proton data, we measure the energy deposit of minimum ionizing particles and use them to extract the corresponding effective depletion depth.