Mikhail Rumiantcev (Joint Institute for Nuclear Research)
The BM&N is designed as a spectrometer capable of detecting charged hadrons, electrons and photons in heavy-ion collisions in the energy range of the Nuclotron. To reach this goal the detector will include a precise tracking system and a high-performance particle identification system based on time-of-flight measurements. ToF system consist of two part: ToF400 and ToF700 which are located on 4 m and 7 m from target respectively. ToF700 wall will provide with the pion/kaon separation up to 3 GeV/c and proton/kaon separation up to 5 GeV/c in “high rate” region near to beam. ToF400 will provide identification of charged hadrons at intermediate momentum (0.1 – 2.5 GeV/c) and large angles. In both case ToF system will based on multigap Resistivity Plate Chamber with time resolution better than 80 ps. Result of R&D and beam test of mRPC for ToF400 will present in report. The construction of ToF400 wall, design of gas box for mRPC, and gas system are discussing.
Serguei Lobastov (Joint Institute for Nuclear Research (JINR))