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Numbers from Giacomo’s extrapolation of current rates + new shielding effect, still to be verified with upgrade MC
CERN, 21/2/2014 A. Cardini / INFN Cagliari
Some comments• M23R1 rates after LS1 will be as high as what we experience now in M1R1
• We will also experience important rates in M23R2
• Detector aging should hopefully not be a major problem – although we would like to perform an R&D on this
• Rate is (usually) not the main issue: the current reaodut (tuned to have the maximum possible efficiency in a low occupancy environment) is not optimized for the upgrade conditions large occupancies, mainly due to low energy photon conversion in gas gaps, create a large number of ghost hits that will affect muon identification performance
• Efforts should go in the following directions:
– Performance studies with extrapolations/toy MC/full upgrade MC– Optimized readout geometry– Optimized readout logic (for example, AND+OR instead of current OR+OR)– Ageing tests– New FE electronics
CERN, 21/2/2014 A. Cardini / INFN Cagliari
Outlook
• Slides on upgraded muon system performances available here: https://indico.cern.ch/event/299158/ (muon meeting of 03FEB14)
• Next Monday during LHCb Week we will continue these discussions in Monday’s muon meeting https://indico.cern.ch/event/298016/
CERN, 21/2/2014 A. Cardini / INFN Cagliari