Neutrino Heavy Water Detector at the SNS

COHERENT collaboration at the Spallation Neutrino Source (SNS) at ORNL utilizing intensive low energy neutrino flux to measure various neutrino interactions. With the focus to study Coherent Elastic Neutrino Scattering (CEvNS). Precise measurement of the CEvNS can test prediction of the standard model (SM) and look for hints of a new physics beyond SM. Preset limitation for the experiment is knowledge of the neutrino flax which is based on theoretical calculations and presently estimated to have accuracy of 10%. We will describe a new heavy water detector which was recently commissioned at the SNS with the goal to calibrate neutrino flux with accuracy up to 2-3%.