Speakers
Description
We present the development of a proof-of-concept (PoC) for the PoWER system, a novel photon detection proposal for large-scale Liquid Argon Time Projection Chambers (LArTPCs). The PoWER system distinguishes itself by integrating veto capabilities, low production cost, and a streamlined assembly process.
This PoC was developed at the Leptons Laboratory (UNICAMP-Brazil), including detector modeling, as well as a liquid-argon-based cryogenic and electronic setup. The device employs four SiPM arrays: two sensitive to VUV light and two for visible light. Its mechanical structure consists of two concentric cubes: an outer cube internally lined with Vikuiti foils and an inner acrylic cube with internal walls covered by PEN foils.
Two alpha sources were used during testing. One source, placed inside the inner cube, produced scintillation light wavelength-shifted by PEN and detected by both SiPM types. A second source, positioned between the cubes, generated light detected exclusively by VUV-sensitive SiPMs, allowing the study of veto capabilities. Additionally, a gamma source located outside the cryostat produced events in both regions, enabling event discrimination.
A Geant4-based Monte Carlo simulation was developed alongside the experimental setup, and the veto performance and light yield of the system for alpha and gamma sources were evaluated.
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