Recent Progress on the Ton-Scale Liquid Argon CEvNS Detector COH-Ar 750 from the COHERENT Collaboration

Since the first observation of CEvNS interactions in liquid argon by the COHERENT collaboration in 2017, the 24 kg CENNS-10 detector has continued data collection, accumulating more than three times the original integrated beam power at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). COH-Ar 750 is a forthcoming upgraded ton-scale liquid argon detector designed for precision CEvNS measurements, with a footprint that fits within the same location previously occupied by the CENNS-10 detector in Neutrino Alley. Building on the operational experience and background characterization of its predecessor, COH-Ar 750 incorporates several key upgrades, including a purpose-built cryostat and a redesigned optical light collection system, yielding improved light output with an expected CEvNS event rate of approximately 5,000 events per SNS year. In this talk, I will present the current status of COH-Ar 750 and ongoing efforts toward its first engineering run in 2026.