A: The GigaTracKer (GTK) is the beam spectrometer of the CERN NA62 experiment. The detector features challenging design specifications, in particular a peak particle flux reaching up to 2.0 MHz/mm 2 , a single hit time resolution smaller than 200 ps and, a material budget of 0.5% X 0 per tracking plane. To fulfil these specifications, novel technologies were especially employed in the domain of silicon hybrid time-stamping pixel technology and micro-channel cooling. This article describes the detector design and reports on the achieved performance. K: Particle tracking detectors, Timing detectors, Detector cooling and thermo-stabilization A X P : 1904.12837 1present address:

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The GigaTracker is a hybrid silicon pixel detector built for the \NA62\ experiment aiming at measuring the branching fraction of the ultra-rare kaon decay K + → π + ν ν ¯ at the \CERN\ SPS. The detector has to track particles in a beam with a flux reaching 1.3 MHz/mm2 and provide single-hit timing with 200 ps \RMS\ resolution for a total material budget of less than 0.5% \X0\ per station. The tracker comprises three 60.8 mm×27 mm stations installed in vacuum ( ∼ 10 − 6 mbar ) and cooled with liquid \C6F14\ circulating through micro-channels etched inside a few hundred micron thick silicon plates. Each station is composed of a 200 μm thick silicon sensor read out by 2×5 custom 100 μm thick ASICs, called TDCPix. Each chip contains 40×45 asynchronous pixels, 300 μm×300 μm each and is instrumented with 100 ps bin time-to-digital converters. In order to cope with the high rate, the \TDCPix\ is equipped with four 3.2 Gb/s serialisers sending out the data. We will describe the detector and the results from the 2014 and 2015 \NA62\ runs

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