First results of the RED-100 experiment for the CEvNS search in close vicinity of the reactor core.

RED-100 is a two-phase emission LXe detector that was deployed at a distance of 19 m from the reactor core at Kalinin Nuclear Power Plant (KNPP). Its goal is to detect Coherent Elastic Neutrino Nucleus Scattering (CEvNS) of reactor electron antineutrinos on Xe nuclei. The data-taking run was provided and included both periods of reactor OFF and ON. Then the detector was decommissioned and shipped back to the laboratory for the upgrade and re-equipment. In this poster, an overview of the experimental setup, preliminary results of background data analysis are discussed. Preliminary plans for the detector upgrade are presented.