DarkSide-20k: A 20 tonne two-phase LAr TPC for direct dark matter detection at LNGS C. E. Aalseth, F. Acerbi, P. Agnes, I. F. M. Albuquerque, T. Alexander, A. Alici, A. K. Alton, P. Antonioli, S. Arcelli, R. Ardito et al. (277 more) Eur. Phys. J. Plus, 133 3 (2018) 131 Published online: 29 March 2018 DOI: 10.1140/epjp/i2018-11973-4