Study on SiPM performance at low temperatures between $-60^{\circ}$C and $-20^{\circ}$C

TL;DR

This study investigates how silicon photomultiplier (SiPM) performance varies between -60°C and -20°C to optimize detector sensitivity for low-background experiments.

Contribution

It provides a comprehensive low-temperature measurement system and detailed analysis of SiPM parameters across a temperature range, identifying optimal operating conditions.

Findings

SiPM parameters vary with temperature

Optimal working conditions improve detector sensitivity

Performance characteristics like SPE resolution and crosstalk are characterized

Abstract

Radon is the main background source of dark matter and neutrino experiments. Radon concentration ($\rm mBq/m^3$) measurement by liquid scintillation detector is a highly sensitive method at low temperatures using silicon photomultipliers (SiPMs) arrays. The SiPM performance characteristics are closely related to the lower detection limit of the detector. In this study, we built an automatic and accurate low-temperature measurement system to study the single photoelectron spectrum, SPE resolution, optical crosstalk, and after-pulse of the SiPM at different temperatures. As a result, we obtained the variation trend of the SiPM parameters at different temperatures, and the SiPM optimal working conditions were obtained, which can improve the detector's sensitivity