Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - Detector R&D and Data Handling
The Gigatracker of the NA62 experiment at CERN
A. Kleimenova,* M. Perrin-Terrin, G. Aglieri Rinella, D. Alvarez Feito, S. Bonacini, A. Ceccucci, J. Degrange, L. Federici, E. Gamberini, J. Kaplon, A. Kluge, A. Mapelli, M. Morel, J. Noël, M. Noy, L. Perktold, P. Petagna, K. Poltorak, G. Romagnoli, E. Minucci, G. Ruggiero, B. Velghe, R. Arcidiacono, C. Biino, F. Marchetto, E. Migliore, S. Chiozzi, A. Cotta Ramusino, M. Fiorini, A. Gianoli, R. Malaguti, F. Petrucci, H. Wahl, E. Cortina Gil
*corresponding author
Full text: Not available
Abstract
NA62 is a fixed-target experiment at the CERN SPS designed to measure the branching ratio of the very rare kaon decay $K^{+} \rightarrow \pi^{+}\nu \bar{\nu}$ with 10% precision. Measurements of time, momentum and direction of incoming beam particles are provided by a beam spectrometer called GigaTracker. The GigaTracker is made of three stations of hybrid silicon pixel detector installed in vacuum ($\sim10^{-6}$ mbar). Each station consists of 18000 pixels of $300\times300\mu m^{2}$ area each, arranged in a matrix of $200\times90$ elements corresponding to a total area of $62.8\times27mm^{2}$. The beam particles, flowing at 750 MHz, are tracked in 4-dimensions by means of time-stamping pixels with the single hit time resolution reaching 115 ps. This performance has to be maintained despite the beam irradiation amounting to a yearly fluence of $4.5\times 10^{14} 1MeV n_{eq}/cm^{2}/200\ days$. In order to limit multiple scattering and beam hadronic interactions, the station material budget is reduced to $0.5\%X_{0}$ by using micro channel cooling (first application in HEP). We will present the detector design and performances during the NA62 data taking periods.
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