  Investigated in this work are sensitivities to non-standard neutrino
interactions (NSI) of a prototype detector placed about 20 meters away from the
Spallation Neutron Source at the Oak Ridge National Laboratory in two years of
data taking. The presumed prototype consists of 10 kg undoped CsI scintillation
crystals directly coupled with SiPM arrays operated at 77 K. Compared to the
COHERENT CsI(Na) detector, a much higher light yield is assumed for the
prototype. An experiment with a cylindrical undoped CsI crystal coupled
directly to a photomultiplier tube at about 77 K was conducted to verify the
light yield assumption. A yield of $33.5 \pm 0.7$ photoelectrons per keV
electron-equivalent (PE/keVee) was achieved in [13, 60] keVee, which is much
closer to the relevant energy region for the NSI search than some of the early
studies.
