  We consider the potential for a 10-kg undoped cryogenic CsI detector
operating at the Spallation Neutron Source to measure coherent elastic
neutrino-nucleus scattering and its sensitivity to discover new physics beyond
the standard model. Through a combination of increased event rate, lower
threshold, and good timing resolution, such a detector would significantly
improve on past measurements. We considered tests of several
beyond-the-standard-model scenarios such as neutrino non-standard interactions
and accelerator-produced dark matter. This detector's performance was also
studied for relevant questions in nuclear physics and neutrino astronomy,
namely the weak charge distribution of CsI nuclei and detection of neutrinos
from a core-collapse supernova.
