Status update on COH-Ar-750 for the COHERENT Collaboration

COH-Ar-750, a tonne-scale liquid argon detector for the COHERENT effort at the Oak Ridge National Lab (ORNL) Spallation Neutron Source (SNS), will have an event rate an order of magnitude higher than its predecessor CENNS-10, allowing for a precision (percent-level) measurement of the coherent elastic neutrino-nucleus scattering (CEvNS) cross section. Achieving this requires 122 3-inch PMTs with custom designed bases and applying wavelength-shifting coating (TPB) throughout the light collection volume. The results of PMT characterization work and TPB coating will be presented. The cryostat and vacuum chamber have underdone extensive testing together with the accompanying liquefying system and these tests and results will also be discussed. The current status of COH-Ar-750 will lead into the discussion of its physics goals including measurement of the CEvNS cross section, charged-current cross section measurements, sensitivity to nuclear form factors, accelerator-produced dark matter, neutrino magnetic moment and other beyond standard model physics scenarios. The COH-Ar-750 deployment timeline at the ORNL SNS will be presented as it will take advantage of the recent SNS proton beam upgrades. Lastly, potential upgrades to the detector, such as the use of silicon photomultipliers, will also be presented.