Speaker
Romualdo Santoro
(INFN+Uni Bari)
Description
The Silicon Pixel Detector (SPD) forms the two innermost layers of the
ALICE Inner Tracking System (ITS). The SPD consists of 120 detector
modules (halfstaves) on two barrel layers at average radii of 3.9 cm and 7.6
cm, respectively. Each half-stave contains two ladders, each ladder
consisting of a 200 μm thick p +n silicon sensor matrix flip-chip bonded to
five 150 μm thick front-end chips. Each chip contains 8, 192 readout cells
arranged in 256 rows and 32 columns with dimensions 50 μm (rφ) x 425
μm (z). The SPD contains nearly 10 7 pixel cells in total. The SPD provides
the high spatial precision, efficiency and granularity required to reconstruct
secondary vertices of charm and beauty meson decays in a region where the
track density could reach 80 tracks/cm 2. The status of the construction and
integration of the SPD will be overviewed. Results on the detector
performance and its implementation in the ALICE simulation framework will
be also discussed.
Author
Romualdo Santoro
(INFN+Uni Bari)
