Speaker
Description
A proof-of-concept test of the PoWER (Polymer Wavelength Shifter and Enhanced Reflection) photon detection system was performed at the Leptons Laboratory, Unicamp. PoWER is an innovative photon detection concept for large liquid argon detectors, aiming at an extremely high light yield of hundreds of photoelectrons per MeV and the capability of actively vetoing events outside the active volume. The system relies on PEN foils as wavelength shifters and on a combination of visible and VUV-sensitive silicon photomultipliers (SiPMs), forming the basis of the active veto. The setup consists of two concentric cubes: an outer $1000~\text{cm}^3$ Teflon cube and an inner $512~\text{cm}^3$ acrylic cube, defining the active volume. The Teflon internal surfaces are covered with Vikuiti reflective foil and four Hamamatsu S14160-6050HS SiPMs, two conventional and two TPB-coated for VUV sensitivity. The acrylic inner walls are lined with PEN foils. Three radioactive sources were used: a natural uranium alpha source inside the active volume, a $^{241}$Am alpha source in the veto region, and an external $^{22}$Na gamma source. The detector operated in liquid argon obtained via \textit{in situ} liquefaction of high-purity gas. A dedicated GEANT4 Monte Carlo simulation of the set-up was developed, and a comparison between real and simulated data will be presented.
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