Speaker
Description
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$^{+} \rightarrow \pi^{+} \nu \overline{\nu}$ at the CERN SPS. The detector has to track particles in a 75 GeV/c hadron beam with a flux reaching 1.3 MHz/mm$^2$ and provide single-hit timing with better than 200 ps r.m.s. resolution for a total material budget of less than 0.5% X$_0$ per station. The tracker comprises three 61mm×27mm stations installed in vacuum (~10$^{−6}$mbar) and cooled with liquid C$_{6}$F$_{14}$ circulating through micro-channels etched inside few hundred of microns thick silicon plates. Each station is composed of a 200$\mu$m thick planar silicon sensor bump-bonded to 2×5 custom 100$\mu$m thick ASIC, called TDCPix. Each chip contains 40×45 asynchronous pixels, each 300$\mu$m×300$\mu$m 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.
