Mr Victor Rogov (JINR)
The fast triggering of nucleus – nucleus collisions and the precise TOF measurement with picosecond time resolution are important features of all high-energy heavy ion experiments at colliders. The fast interaction trigger system of the Multi-Purpose Detector (MPD)experiment is developed for study of Au + Au collisions in energy interval 4 ≤ √Snn ≤ 11 GeV of the NICA collider. The main aims of the trigger system are fast and effective triggering of collision events in the center of MPD setup and the generation of start pulse for the TOF detector. For realization of this goals a two-arm modular Cherenkov detector based on MCP-PMTs, a system of special electronics and a laser calibration system are developed. The required time resolution of the detector is 50 ps (sigma). The detector and electronics concept and design, results of test measurements and MC simulation are presented and discussed.