  The Large Hadron Collider beauty (LHCb) detector is designed to detect decays
of b- and c- hadrons for the study of CP violation and rare decays. At the end
of the LHC Run 2, many of the LHCb measurements remained statistically
dominated. In order to increase the trigger yield for purely hadronic channels,
the hardware trigger will be removed, and the detector will be read out at 40
MHz. This, in combination with the five-fold increase in luminosity, requires
radical changes to LHCb's electronics, and, in some cases, the replacement of
entire sub-detectors with state-of-the-art detector technologies. The Vertex
Locator (VELO) surrounding the interaction region is used to reconstruct the
collision points (primary vertices) and decay vertices of long-lived particles
(secondary vertices). The upgraded VELO will be composed of 52 modules placed
along the beam axis divided into two retractable halves. The modules will each
be equipped with 4 silicon hybrid pixel tiles, each read out by 3 VeloPix
ASICs. The total output data rate anticipated for the whole detector will be
around 1.6 Tbit/s. The highest occupancy ASICs will have pixel hit rates of
approximately 900 Mhit/s, with the corresponding output data rate of 15 Gbit/s.
The LHCb upgrade detector will be the first detector to read out at the full
LHC rate of 40 MHz. The VELO upgrade will utilize the latest detector
technologies to read out at this rate while maintaining the required
radiation-hard profile and minimizing the detector material.
