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Author(s)
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Federici, L (CERN) ; Aglieri Rinella, G (CERN) ; Alvarez Feito, D (CERN) ; Arcidiacono, R (INFN, Turin ; Turin U. ; L'Aquila U.) ; Biino, C (INFN, Turin ; Turin U.) ; Bonacini, S (CERN) ; Ceccucci, A (CERN) ; Chiozzi, S (Ferrara U. ; INFN, Ferrara) ; Cortina Gil, E (Louvain U., CP3) ; Cotta Ramusino, A (Ferrara U. ; INFN, Ferrara) ; Degrange, J (CERN) ; Fiorini, M (Ferrara U. ; INFN, Ferrara) ; Gamberini, E (CERN) ; Gianoli, A (Ferrara U. ; INFN, Ferrara) ; Kaplon, J (CERN) ; Kleimenova, A (Louvain U., CP3) ; Kluge, A (CERN) ; Mapelli, A (CERN) ; Marchetto, F (INFN, Turin ; Turin U.) ; Migliore, E (INFN, Turin ; Turin U.) ; Minucci, E (Louvain U., CP3) ; Morel, M (CERN) ; Noël, J (CERN) ; Noy, M (CERN) ; Perktold, L (CERN) ; Perrin-Terrin, M (Marseille, CPPM) ; Petagna, P (CERN) ; Petrucci, F (Ferrara U. ; INFN, Ferrara) ; Poltorak, K (CERN) ; Romagnoli, G (CERN) ; Ruggiero, G (Lancaster U.) ; Velghe, B (Louvain U., CP3) ; Wahl, H (Ferrara U. ; INFN, Ferrara) |
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Abstract
| The NA62 experiment at the CERN SPS is a fixed target experiment designed to measure the branching ratio of the ultra-rare Kaon decay $K^+$ → $\pi^+$ $\nu$ $\overline{\nu}$. The experiment uses an high-momentum $K^+$ decay in-flight technique to increase the rejection power of the main background: $K^+$ → $\pi^+$ $\pi^0$ . The Gigatracker is a hybrid silicon pixel detector, exposed to a 750 MHz high-energy charged hadron beam, built to give an accurate measurement of $K^+$ momentum and direction together with an high precision measurement of the beam particle arrival time (115 ps RMS resolution per plane). It comprises three stations placed right before the $K^+$ decay region and inserted around two achromats. The detector works in vacuum
(∼10$^{-6}$ mbar) at about −10°C.
Each station is made of a 200 μm thick silicon sensor readout by 10 TDCPix, custom 100 μm thick ASICs, and cooled by an innovative double circuit silicon micro-channel cooling system. All these parts are designed to minimize the total material budget which, in the final detector, amounts to less than 1.5% 𝑌 0 for the three stations.
In order to sustain the high rate of incoming particles, each TDCPix, operating in a self triggered mode, is equipped with four 3.2 Gb/s serializers sending data to the detector DAQ system based on a read-out card per TDCPix chip sending trigger-matched hits to 6 PC servers. I will describe the whole detector and present some of the results from data collected during the 2016 NA62 runs. |