  The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory,
Tennessee, provides an intense flux of neutrinos in the few tens-of-MeV range,
with a sharply-pulsed timing structure that is beneficial for background
rejection. In this white paper, we describe how the SNS source can be used for
a measurement of coherent elastic neutrino-nucleus scattering (CENNS), and the
physics reach of different phases of such an experimental program (CSI:
Coherent Scattering Investigations at the SNS).
