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 K+-> pi(+)v (v) over bar. The experiment uses an high-momentum K+ decay in-flight technique to increase the rejection power of the main background: K+-> pi(+)pi(0).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 K+ 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 K+ decay region and inserted around two achromats. The detector works in vacuum (similar to 10(-6) mbar) at about -10 degrees C.Each station is made of a 200 mu m thick silicon sensor readout by 10 TDCPix, custom 100 mu m 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% X-0 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.