Packaging strategies for large SiPM-based cryogenic photo-detectors

摘要

The DarkSide program aims to a WIMP direct detection using a dual phase argon time projection chamber. The next generation experiment, DS-20k, will be a detector in excess of 20 tonnes of fiducial mass. A pivotal aspect to the sensitivity of the experiment is its light detection technology. The DarkSide collaboration decided to adopt Silicon Photomultipliers for its Photo Detector Module (PDM). Each PDM includes a total active surface of 25 cm~2 of SiPMs read-out by a front-end board capable of aggregating all the signals in a single analog output with a signal-to-noise ratio larger than 8. In this talk an overview of the silicon packaging strategies adopted by the DarkSide collaboration will be introduced with attention to the mass-production of about 10000 PDMs, corresponding to 200000 SiPMs and to the material selection in terms of cryogenic operation and high radio-purity.