New Chambers for M23R12for the Muon Upgrade

Alessandro Cardini INFN Cagliari

Requirements: from TDR

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

From the PID TDR

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

From Martellotti’s slides 3/2/2014

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

More from Giuseppe

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

Some possible solutions (Martellotti)

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

More from Martellotti

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