Abstract
The Darkside experiment aims at the direct detection of WIMPs using a dual phase liquid Argon TPC . The next generation experiment, DarkSide-20k, will push the fiducial mass liquid argon to 20 tonnes. The light detection is a crucial part of the project; DS-20k will use, instead of the standard PhotoMultipliers (PMs), the Silicon PhotoMultipliers (SIPMs). This kind of photo-sensors will permit a higher photo-detection efficiency and a lower background, compared to standard PMs. The TPC will be outfitted with about 200,000 SiPMs grouped into 8200 single readout channels, 25 cm2 Photo Detection Module (PDM) . In this paper, the design and performance of the PDMs will be reported. The strategy to scale from the R&D to the DS-20k will be also discussed, together with recent results obtained from the first prototype Darkside-Proto-0 detector.
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