1. New Chambers for M23R12 for the Muon Upgrade Alessandro Cardini INFN Cagliari

2. Requirements: from TDR Numbers from Giacomo’s extrapolation of current rates + new shielding effect, still to be verified with upgrade MC CERN, 21/2/2014A. Cardini / INFN Cagliari

3. 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, 21/2/2014A. Cardini / INFN Cagliari

4. From the PID TDR CERN, 21/2/2014A. Cardini / INFN Cagliari

5. From Martellotti’s slides 3/2/2014 CERN, 21/2/2014A. Cardini / INFN Cagliari

6. More from Giuseppe CERN, 21/2/2014A. Cardini / INFN Cagliari

7. Some possible solutions (Martellotti) CERN, 21/2/2014A. Cardini / INFN Cagliari

8. More from Martellotti CERN, 21/2/2014A. Cardini / INFN Cagliari

9. Outlook Slides on upgraded muon system performances available here: https://indico.cern.ch/event/299158/ (muon meeting of 03FEB14)https://indico.cern.ch/event/299158/ Next Monday during LHCb Week we will continue these discussions in Monday’s muon meeting https://indico.cern.ch/event/298016/ https://indico.cern.ch/event/298016/ CERN, 21/2/2014A. Cardini / INFN Cagliari