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The "Auger Muons and Infill for the Ground Array" (AMIGA) project providesdirect muon counting capacity to the Pierre Auger Observatory and extends itsenergy detection range down to 0.3 EeV. It currently consists of 61 detectorpairs (a Cherenkov surface detector and a buried muon counter) distributed overa 23.5 km2 area on a 750 m triangular grid. Each counter relies on segmentedscintillator modules storing a logical train of '0's and '1's on eachscintillator segment at a given time slot. Muon counter data is sampled andstored at 320 MHz allowing both the detection of single photoelectrons and theimplementation of an offline trigger designed to mitigate multi-pixel PMTcrosstalk and dark rate undesired effects. Acquisition is carried out by thedigital electronics built around a low power Cyclone III FPGA. This paperpresents the digital electronics design, internal and external synchronizationschemes, hardware tests, and first results from the Observatory.

Digital Electronics for the Pierre Auger Observatory AMIGA Muon Counters