  RED-100 is a two-phase detector for study of coherent elastic scattering of
reactor electron antineutrinos off xenon atomic nuclei. The detector contains a
total of 200 kg of liquid xenon in a titanium cryostat with 160 kg of xenon in
active volume inside a Teflon-made light collection cage associated with
electrode system. The active volume is viewed by two arrays of nineteen
3"-diameter Hamamatsu R11410-20 PMTs assembled in two planes on top and bottom.
The electrode system is equipped with an electron shutter (a patented device)
to reduce a "spontaneous" single-electron noise. The detector was tested in a
ground-level laboratory. The obtained results demonstrate that detection of
coherent elastic scattering of reactor antineutrinos off xenon nuclei at
Kalinin nuclear power plant with the RED-100 detector is feasible with a
threshold of 4 ionization electrons.
