Abstract
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/mm2, a single hit time resolution smaller than 200 ps and, a material budget of 0.5% X0 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.
Highlights
Detector designThe GTK was designed to fulfil the specifications listed in table 1
The NA62 GigaTracKer: a low mass high intensity beam 4D tracker with 65 ps time resolution on tracks
The assembly made of the hybrid pixel detector (HPD) and cooling plate is inserted in a countersink in a printed circuit board (Carrier PCB) to which the plate is clamped as shown in figure 6
Summary
The GTK was designed to fulfil the specifications listed in table 1. The GTK had to be made such that any tracking plane could be promptly replaced once the irradiation had induced significant performance degradation This consideration imposed a tracking station concept that would be compact, standard and self-contained. The assembly made of the HPD and cooling plate is inserted in a countersink in a printed circuit board (Carrier PCB) to which the plate is clamped as shown in figure 6. In the region outside the vacuum vessel, the PCB is equipped with optical tranceivers communicating through fibers with readout boards 250 meters away in surface counting room. These boards provide clocks and configuration instructions and receive and process the data of all fired pixels.
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