A tonne-scale liquid argon scintillation detector for precision CEvNS studies

Large-scale, low-threshold detectors offer the possibility to measure coherent elastic neutrino-nucleus scattering (CEvNS) cross-sections with high statistical precision. These measurements permit a broad collection of physics studies, such as placing improved constraints upon non-standard neutrino interactions and probing neutron distributions within nuclei. Further, a large-scale detector at a spallation target provides a highly sensitive probe of accelerator-produced dark-matter. The COHERENT collaboration has designed a $\sim$750~kg liquid argon (LAr) scintillation detector to be deployed at the spallation neutron source at Oak Ridge National Laboratory with a $\sim$610~kg fiducial volume viewed by an array of 3-inch photo-multiplier tubes. The detector is designed to achieve the required $\sim$20 keVnr threshold needed for efficient and robust detection of nuclear recoils. In this talk, we will discuss the physics sensitivity of the detector, present the experimental design, and outline ongoing R\&D to further improve scintillation light collection for future CEvNS studies with LAr.