  We describe the design and assembly of the LUX-ZEPLIN experiment, a direct
detection search for cosmic WIMP dark matter particles. The centerpiece of the
experiment is a large liquid xenon time projection chamber sensitive to low
energy nuclear recoils. Rejection of backgrounds is enhanced by a Xe skin veto
detector and by a liquid scintillator Outer Detector loaded with gadolinium for
efficient neutron capture and tagging. LZ is located in the Davis Cavern at the
4850' level of the Sanford Underground Research Facility in Lead, South Dakota,
USA. We describe the major subsystems of the experiment and its key design
features and requirements.
