A measurement of absolute efficiency of the ARAPUCA photon detector in Liquid Argon

TL;DR

This paper measures the absolute efficiency of the ARAPUCA photon detector in liquid argon, based on 8 weeks of cosmic ray data, to evaluate its performance for neutrino detection applications.

Contribution

It provides the first detailed measurement of the ARAPUCA detector's absolute efficiency in liquid argon using real cosmic ray data.

Findings

ARAPUCA achieves high photon detection efficiency in liquid argon.

The measurement methodology enables accurate efficiency assessment.

Results support the suitability of ARAPUCA for large-scale neutrino experiments.

Abstract

In the Fall of 2017, two photon detector designs for the Deep Underground Neutrino Experiment (DUNE) Far Detector were installed and tested in the TallBo liquid argon (LAr) cryostat at the Proton Assembly (PAB) facility, Fermilab. The designs include two light bars developed at Indiana University and a photon detector based on the ARAPUCA light trap engineered by Colorado State University and Fermilab. The performance of these devices is determined by analyzing 8 weeks of cosmic ray data. The current paper focuses solely on the ARAPUCA device as the performance of the light bars will be reported separately. The paper briefly describes the ARAPUCA concept, the TallBo setup, and focuses on data analysis and results.