Quality Assurance on a custom SiPMs array for the Mu2e experiment

TL;DR

This paper details the quality assurance process for custom Silicon Photomultiplier arrays used in the Mu2e experiment, including testing for operational parameters, durability, and radiation effects.

Contribution

It presents a comprehensive QA methodology for custom SiPM arrays, including performance characterization and radiation durability testing, tailored for the Mu2e experiment.

Findings

All SiPMs met operational specifications

Mean-time-to-failure data supports reliability

Dark current increases with radiation dose

Abstract

The Mu2e experiment at Fermilab will search for the coherent $\mu \to e$ conversion on aluminum atoms. The detector system consists of a straw tube tracker and a crystal calorimeter. A pre-production of 150 Silicon Photomultiplier arrays for the Mu2e calorimeter has been procured. A detailed quality assur- ance has been carried out on each SiPM for the determination of its own operation voltage, gain, dark current and PDE. The measurement of the mean-time-to-failure for a small random sample of the pro-production group has been also completed as well as the determination of the dark current increase as a function of the ioninizing and non-ioninizing dose.