Speaker
Description
The aim of the Upgrade II of the LHCb detector is to operate during Run 5 of the CERN Large Hadron Collider (LHC) at a luminosity of 1·1034 cm−2s−1 to collect a data set of 300 f b−1. The increase in particle densities requires a substantial modification of the present Electromagnetic Calorimeter (ECal). The modules of the new calorimeter, the PicoCal, must feature radiation-hard technologies and timing capabilities down to tens of picoseconds. Spaghetti calorimeter (SpaCal) and Shashlik technologies will be used for the upgrade. Moreover, an enhancement is planned already during the LS3 of the LHC, to cope with ageing effects of the present
modules.
Achieving picosecond-level time resolution requires optimization of all calorimeter components. Protypes of SpaCal have been tested on beam at DESY and SPS with electrons between 1 − 100 GeV, studying the contribution to the time resolution of the cables, shaping circuits and readout electronics. Time resoulution at tens of picoseconds have been achieved at high energies.
This contribution will describe the upgraded modules of the LHCb ECal, and the preliminary results of characterization at test beam.