New veto hodoscope ANTI-0 for the NA62 experiment at CERN

The NA62 experiment is a fixed-target experiment at the CERN SPS. The main goal of the experiment is to measure the branching ratio of the ultra-rare kaon decay K+π+ν. The NA62 detector allows also to study other rare kaon decays and to search for very weakly coupled particles of MeV-GeV mass-scale. The new ANTI-0 hodoscope is proposed and designed to veto events with charged halo particles entering the decay volume. It is now being assembled at CERN. The detector design, the performance simulation and the results of measurements with cosmic rays and test beams for the individual elements are presented. The commissioning and the first run of data-taking is scheduled for after the end of LS2 long shutdown (April 2021).