Speaker
Description
DarkSide-20k is a global direct dark matter detection experiment in the construction phase at LNGS (in Italy). The core of the detector is a dual-phase Time Projection Chamber (TPC) filled with 50 tonnes of low-radioactivity liquid argon. The entire TPC wall is surrounded by a pure polymethylmethacrylate (PMMA) of 15 cm, which acts as a neutron veto, immersed in a second low-radioactivity liquid argon bath enclosed in a stainless steel vessel. The entire detector is enclosed in a protoDUNE-like cryostat filled with 600 tons of atmospheric argon. DarkSide-20k is designed to deploy several major novel technologies: (i) underground argon at the >100 tonne scale (integrated over the central time projection chamber and inner veto volumes); (ii) large-area cryogenic SiPM array detectors at the scale of 26 m2; and, (iii) a TPC fully formed in acrylic. This talk presents the progress of the overall experiment construction, and its flagship dark matter search sensitivity based on radioassay of the experiment component materials.