The Gigatracker, the silicon beam tracker for the NA62 experiment at CERN

Federici, L. and Aglieri Rinella, G. and Alvarez Feito, D. and Arcidiacono, R. and Biino, C. and Bonacini, S. and Ceccucci, A. and Chiozzi, S. and Cortina Gil, E. and Cotta Ramusino, A. and Degrange, J. and Fiorini, M. and Gamberini, E. and Gianoli, A. and Kaplon, J. and Kleimenova, A. and Kluge, A. and Mapelli, A. and Marchetto, F. and Migliore, E. and Minucci, E. and Morel, M. and Noël, J. and Noy, M. and Perktold, L. and Perrin-Terrin, M. and Petagna, P. and Petrucci, F. and Poltorak, K. and Romagnoli, G. and Ruggiero, G. and Velghe, B. and Wahl, H. (2020) The Gigatracker, the silicon beam tracker for the NA62 experiment at CERN. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 958. ISSN 0168-9002

Abstract

The Gigatracker is the NA62 beam tracker. It is made of three 63.1mm×29.3mm stations of 300μm×300μm hybrid silicon pixel detectors installed in vacuum (∼10 −6 mbar). The beam particles, flowing at 750MHz, are traced in 4-dimensions by mean of time-stamping pixels with a design resolution of 200ps. This performance has to be maintained despite the beam irradiation amounting to a yearly fluence of 2×10 14 1MeVn eq ∕cm 2 . The detector material minimization is paramount, as the detector faces the full beam. The station material budget is reduced to 0.5%X 0 by using (HEP world first) micro-channels cooling. We will describe the detector design and performances during the NA62 runs.