Data transmission and selection for the L0 calorimeter trigger of LHCb

This report describes the optical transmitter boards and the Selection Crate, designed by the Bologna INFN-LHCb group, for the data transmission and the L0 calorimeter trigger of the LHCb experiment. The optical transmitters are used throughout the calorimeter system for data acquisition and the data transmission to the L0 trigger system. The optical transmitters allow transmitting 32 bit at the LHC clock of 40.08 MHz on a single fibre. The Selection Crate (SC) is used to select the most energetic deposits detected by the electromagnetic and the hadron calorimeters of LHCb, as well as to evaluate other auxiliary global trigger quantities (i.e. the total energy released and the hit multiplicity). The Selection Crate is a modular system equipped with homogeneous Selection Boards

Study of penetrating cosmic ray muons and search for large scale anisotropies at the Gran Sasso Laboratory

The MACRO detector, located in the underground Gran Sasso Laboratory, had its initial data run from February 27 to May 30, 1989, using the first supermodule (SΩ∼800 m2sr). Approximately 245 000 muon events were recorded. Here are reported the results of the analysis of penetrating muons which determine the measured vertical muon flux at depths greater than 3000 m.w.e. In addition the data have been used to search for large scale anisotropies. © 1990