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The NA62 experiment aims at measuring rare kaon decays, in order to precisely test the standard model. The RICH (Ring Imaging CHerenkov) detector of the experiment is instrumental in charged-particle identification and in measurement of their crossing time, with a resolution better than 100 ps. Here we describe the design of the Level-0 trigger system for the RICH, which provides a precise time reference by counting the input hit multiplicity within programmable fine-time windows. Since the design does not use spatial information and stands the maximum input rate of TDC-based NA62 systems, it can be deployed also in other subdetectors.

Real-time FPGA design for the L0-trigger of the RICH detector of the NA62 experiment at CERN SPS