NA62 is a fixed-target experiment at the CERN SPS dedicated to measurements of rare kaon decays. Such measurements, like the branching fraction of the K+ → π+ ν ν̄ decay, have the potential to bring significant insights into new physics processes when comparison is made with precise theoretical predictions. For this purpose, innovative techniques have been developed, in particular, in the domain of low-mass tracking devices. Detector construction spanned several years from 2009 to 2014. The collaboration started detector commissioning in 2014 and will collect data until the end of 2018. The beam line and detector components are described together with their early performance obtained from 2014 and 2015 data.

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