The LHCb Milano group is responsible of designing, building and assembly the hybrid circuits of the front-end electronic and the flex cables of the Upstream Tracker (UT) for the upgraded LHCb detector. The UT detector replaces the existing TT stations upstream of the LHCb magnet with a new silicon micro-strip detector.

The UT has a new front-end chip compatible with 40 MHz readout, silicon sensors with improved radiation hardness, finer readout granularity, and improved acceptance coverage at small polar angles. The outer region of each detection layer will be covered by p-in-n sensors with 10 cm long strips and a pitch of about 180 mum, while n-in-p sensors with half the pitch and strip length will be employed in the regions of highest particle density close to the beam pipe. The innermost sensors will have a circular cutout to optimize the forward acceptance. The  LHCb Milano group is also involved in the design and supply of the cooling system of the whole detector, provided by evaporative C02.

The Milano group will deliver more than 1,000 hybrid circuits to the collaboration, testing their performance before mounting them on the detector module. A dedicated burn-in procedure has been designed to qualify the electronics and prevent early failures.