Speaker
Description
The Scintillating Fibre (SciFi) Tracker is designed to replace the current downstream tracking detectors in the LHCb Upgrade during 2019-20 (CERN/LHCC 2014-001; LHCb TDR 15). Collecting data at the increased luminosity foreseen for the upgrade will only be possible with front-end electronics read out at 40MHz and a flexible software-based triggering system that will increase the data rate as well as the events-of-interest efficiency . The SciFi Tracker is based on 2.5 metre long multi-layered ribbons from a total of 11000 km of 0.250 mm diameter scintillating fibre as the active medium and signal transport over 12 planes covering 340 m^2. Cooled silicon photomultiplier (SiPM) arrays with 128 channels and 0.25 mm channel width are used as readout. The front-end electronics are designed to digitise the signals from the SiPMs with a custom ASIC chip, the PACIFIC, for the approximately 500k channels and reconstruct the track hit position within an on-board FPGA. The PACIFIC is a 64-channel chip with a fast 10~ns shaping time, dual 25 ns interleaved integrators, and provides binary signal-over-threshold information from three signal comparators per channel.
This presentation will cover the test beam results and experiences from the 2018 Slice Test at the CERN SPS. We will report the performance of the fibre tracker from first measurements using the production front-end electronics readout with the LHCb MiniDaq2 (PCIE40) 40 MHz readout which was run synchronously with the TimePix3 telescope.
