Speaker
Mr
Giulio Avoni
(Istituto Nazionale di Fisica Nucleare (INFN))
Description
This report describes the Selection Crate, designed by INFN for the L0 calorimeter
trigger of the LHCb experiment.
The Selection Crate is a modular system which consists in 8 Selection Boards (SB)
used to select the most energetic clusters detected by the electromagnetic and hadron
calorimeters, as well to evaluate other global trigger variables.
A SB is equipped with 28 x 1.6 Gbps optical inputs and 3 x 1.6 Gbps optical outputs.
The slow control is achieved by using a onboard diskless ethernet-booting CreditCard
PC with a related GlueCard bus converter, while a TTCrq board provides the fast
control TFC signals of the LHC TTC system.
Each SB receives data from the front-end through 3 MPO ribbon connectors and sends
data to the trigger decision unit through single channel optical links.
All the optical links are suited for multimode, 1.6 Gbps, 850 nm fiber with sync
patterns and 8B/10B coding. The optical transmitters used throughout the calorimeter
have been designed by INFN Bologna. The optical transmitter boards are capable of
sending on a single fiber up to 8 x 32bit at the LHCb clock of 40.08 MHz.
Author
Mr
Giulio Avoni
(Istituto Nazionale di Fisica Nucleare (INFN))
Co-authors
Mr
Domenico Galli
(Universita' di Bologna e Istituto Nazionale di Fisica Nucleare (INFN))
Mr
Gabriele Balbi
(Istituto Nazionale di Fisica Nucleare (INFN))
Mr
Ignazio D'Antone
(Istituto Nazionale di Fisica Nucleare (INFN))
Mr
Ignazio Lax
(Istituto Nazionale di Fisica Nucleare (INFN))
Mr
Umberto Marconi
(Istituto Nazionale di Fisica Nucleare (INFN))
Mr
Vincenzo Vagnoni
(Istituto Nazionale di Fisica Nucleare (INFN))
