Wavelength-shifting light traps for SWGO and other applications
M. Pihet (1), M. Mariotti (1, 2), C. Arcaro (1) (for the SWGO, Collaboration, (1) INFN Padua, (2) University of Padua)

TL;DR
This paper explores wavelength-shifting light traps using SiPMs as a cost-effective alternative to PMTs, demonstrating their potential for improved gamma/hadron separation in SWGO and other applications.
Contribution
It introduces a novel WLS detector design with single and double-shift configurations, evaluating their efficiency and potential for broad scientific use.
Findings
Double-shift design channels light effectively to fiber ends.
Light traps with SiPMs outperform traditional PMTs in non-focused light scenarios.
Potential for improved gamma/hadron separation in SWGO using WLS light traps.
Abstract
Wavelength-shifting (WLS) materials contain molecules that absorb light and reemit at longer wavelengths. They can be used for light detection because they provide a large effective area for low cost and they are able to efficiently trap and guide light because of total internal reflection processes. We are currently developing such a WLS detector, considering two main designs: A single-shift design with one wavelength shift (tile) and a double-shift design with two wavelength shifts (tile and fiber). As photodetectors we use small Silicon photomultipliers (SiPMs) with a high photon detection efficiency (PDE) and single-photon sensitivity. The double-shift layout goes at the expense of detection efficiency. In this design however, light is channeled to the two ends of a fiber, thus requiring a reduced photosensitive area compared to the single-shift layout. We will present the results…
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