  The Dark matter Experiment using Argon Pulse-shape discrimination (DEAP) has
been designed for a direct detection search for particle dark matter using a
single-phase liquid argon target. The projected cross section sensitivity for
DEAP-3600 to the spin-independent scattering of Weakly Interacting Massive
Particles (WIMPs) on nucleons is $10^{-46}~\rm{cm}^{2}$ for a 100 GeV/$c^2$
WIMP mass with a fiducial exposure of 3 tonne-years. This paper describes the
physical properties and construction of the DEAP-3600 detector.
