Origin-X: A Ktonne Scale Neutrinoless Double Beta Decay Experiment with 10³⁰yr Half-life Sensitivity.

Large detectors employing xenon are a leading technology in existing and planned searches for new physics, including searches for neutrinoless double beta decay (0νββ) and dark matter. While upcoming detectors will employ target masses of a ton or more, further extending gas- or liquid-phase Xe detectors to the ktonne scale would enable extremely sensitive next-generation searches for rare phenomena. The key challenge to extending this technology to detectors well beyond the tonne scale is the acquisition of the xenon itself. We describe the motivation for extending xenon time-projection chambers to the kton scale and possible avenues for xenon acquisition.