DarkSide-20k and its research and development

The DarkSide-20k project is aiming to use a dual-phase argon detector to search WIMPs. It has the capability to push the sensitivity for WIMP detection several orders of magnitude beyond current levels. It will have ultra-low backgrounds and sensitivity to WIMP-nucleon cross section down to 1.2 x 10$^{47}$ cm$^2$ for WIMPs of 1 TeV/c$^2$ mass with a LAr exposure of 100 t yr. The DarkSide-20k detector is currently under construction at LNGS. The detector mainly consists of a sealed acrylic Time Projection Chamber (TPC), an active neutron veto constructed by gadolinium-doped acrylic panels and a membrane cryostat. The R&D of the TPC and the cryogenic system is currently in progress at CERN. The R&D of the veto detector is also underway, by cooperating with a company called Donchamp Acrylic. This talk will give an overview of the DarkSide-20k detector and discuss the R&D work for the TPC, the cryogenic system and the Veto detector.