The Cedar (Cerenkov Differential Counters with Achromatic Ring Focus) Project

All hadron beams of the CERN SPS are being equipped with a mass identification facility. The project involves the construction of twelve differential Cerenkov counters specialized either for the energy range of 15 GeV/c to 150 GeV/c (CEDAR-W) or 30 GeV/c to 340 GeV/c (CEDAR-N). The performances of four W-type and one N-type CEDAR are reported.