A Network of Dual-Phase Xenon Time Projection Chambers for Dark Matter: Exposure, Background and Cross-Section Reach Computed from Counting Statistics

Three dual-phase xenon time projection chambers, each with 7 tonnes of fiducial liquid xenon, are designed as a network and their dark-matter reach is computed from exposure and background counting. One thousand live days give 57.5 tonne-years of exposure; at a stated post-discrimination background of 1.5 events per tonne-year in the search window, 86 background events are expected, and the computed spin-independent WIMP-nucleon cross-section reach at 40 GeV is 2.61e-49 square centimetres. The network holds 25.5 tonnes of xenon inventory, 495 tonnes of plant and 390 kW of continuous power. All figures are computed from the stated exposure model; the design is simulated, not measured.