Author/Authors :
Fiorini، نويسنده , , M. and Carassiti، نويسنده , , V. and Ceccucci، نويسنده , , A. and Cortina، نويسنده , , E. and Cotta Ramusino، نويسنده , , A. and Dellacasa، نويسنده , , G. and Jarron، نويسنده , , P. and Kaplon، نويسنده , , J. and Kluge، نويسنده , , A. and Marchetto، نويسنده , , F. and Martin، نويسنده , , E. and Martoiu، نويسنده , , S. and Mazza، نويسنده , , G. and Noy، نويسنده , , M. and Petrucci، نويسنده , , F. and Riedler، نويسنده , , P.، نويسنده ,
Abstract :
The beam spectrometer of the NA62 experiment, named Gigatracker, has to perform single track reconstruction with unprecedented time resolution (150 ps rms) in a harsh radiation environment. To meet these requirements, and in order to reduce material budget to a minimum, three hybrid silicon pixel detector stations will be installed in vacuum. An adequate strategy to compensate for the discriminator time-walk must be implemented and R&D investigating two different options is ongoing. Two read-out chip prototypes have been designed in order to compare their performance: one approach is based on the use of a constant-fraction discriminator followed by an on-pixel TDC, while the other one is based on the use of a time-over-threshold circuit followed by a TDC shared by a group of pixels. This paper describes the Gigatracker system, presents the global architectures of both read-out ASICs and reviews the current status of the R&D project.
Keywords :
Solid-state detectors , Tracking and position-sensitive detectors , time-to-digital converter , Silicon pixel ASIC
