The Gigatracker is a hybrid silicon pixel detector developed for the NA62 experiment at CERN, which aims at measuring the branching fraction of the ultra-rare kaon decay K+ → π+ vv at the CERN SPS. The detector has to track particles in a 75 GeV/c hadron beam with a flux reaching 1.3 MHz/mm2 and provide single-hit timing with better than 200 ps r.m.s. resolution for a total material budget of less than 0.5% X0 per station. The tracker comprises three 61 × 27 mm2 stations installed in vacuum (about 10-6 mbar) and cooled with liquid C6F14 circulating through micro-channels etched inside few hundred of microns thick silicon plates. Each station is composed of a 200 μm thick planar silicon sensor bump-bonded to 2 × 5 custom 100 μm thick ASIC, called TDCpix. Each chip contains 40 × 45 asynchronous pixels, each 300 × 300 μm2 and is instrumented with 720 time-to-digital converter channels with 100 ps bin. In order to cope with the high rate, the TDCpix is equipped with four 3.2 Gb/s serializers sending out the data. Detector description, operational experience and results from the NA62 experimental runs will be presented.

Operational experience with the NA62 Gigatracker

Fiorini, Massimiliano;Petrucci, F.;
2016

Abstract

The Gigatracker is a hybrid silicon pixel detector developed for the NA62 experiment at CERN, which aims at measuring the branching fraction of the ultra-rare kaon decay K+ → π+ vv at the CERN SPS. The detector has to track particles in a 75 GeV/c hadron beam with a flux reaching 1.3 MHz/mm2 and provide single-hit timing with better than 200 ps r.m.s. resolution for a total material budget of less than 0.5% X0 per station. The tracker comprises three 61 × 27 mm2 stations installed in vacuum (about 10-6 mbar) and cooled with liquid C6F14 circulating through micro-channels etched inside few hundred of microns thick silicon plates. Each station is composed of a 200 μm thick planar silicon sensor bump-bonded to 2 × 5 custom 100 μm thick ASIC, called TDCpix. Each chip contains 40 × 45 asynchronous pixels, each 300 × 300 μm2 and is instrumented with 720 time-to-digital converter channels with 100 ps bin. In order to cope with the high rate, the TDCpix is equipped with four 3.2 Gb/s serializers sending out the data. Detector description, operational experience and results from the NA62 experimental runs will be presented.
2016
Branching fractions, Hadron beams, Hybrid silicon, Rare kaon decay, Time to digital converters
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2400075
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