The Gigatracker detector of the NA62 experiment at CERN SPS

The NA62 experiment at the CERN SPS is a fixed target experiment designed to measure the branching ratio of the ultra-rare Kaon decay [Formula presented]. The experiment uses an high-momentum [Formula presented] decay in-flight technique to increase the rejection power of the main background: [Formula presented]. The Gigatracker is a hybrid silicon pixel detector, exposed to a 750 MHz high-energy charged hadron beam, built to give an accurate measurement of [Formula presented] momentum and direction together with an high precision measurement of the beam particle arrival time (115 ps RMS resolution per plane). It comprises three stations placed right before the [Formula presented] decay region and inserted around two achromats. The detector works in vacuum ([Formula presented]) at about [Formula presented]. Each station is made of a [Formula presented] thick silicon sensor readout by 10 TDCPix, custom [Formula presented] thick ASICs, and cooled by an innovative double circuit silicon micro-channel cooling system. All these parts are designed to minimize the total material budget which, in the final detector, amounts to less than 1.5% [Formula presented] for the three stations. In order to sustain the high rate of incoming particles, each TDCPix, operating in a self triggered mode, is equipped with four 3.2 Gb/s serializers sending data to the detector DAQ system based on a read-out card per TDCPix chip sending trigger-matched hits to 6 PC servers. I will describe the whole detector and present some of the results from data collected during the 2016 NA62 runs.