1 News and Miscellaneous UPO May Didier Contardo, Jeff Spalding -Phase 2 Scope and Cost exercise

Extend pixel eta range is an option Precision timing added to new calorimetry is an option under consideration, depends on studies and R&D L1 Trigger Upgrade Track-Trigger Push/Pull Track Trigger Long Barrel Barrel+ EndCap EE/EB FE 10µs 500kHz CSC DCFBB 20µs 500kHz DT ROB/ROS 20µs 1MHz New Tracker (silicon and pixels) Endcap/Forward Calorimeters New EE Extend HE longevity: similar or new active elements - same absorber - can increase granularity Retrofit HFNew HF Extending muon eta range is an option New EE and HE - new absorber - extend eta range Overall Upgrade Branches and Options considered for phase 2 2 Muons Complete 1.6<eta<2.4 with GEM/GRPC

Extend pixel eta range is an option Precision timing added to new calorimetry is an option under consideration, depends on studies and R&D L1 Trigger Upgrade Track-Trigger Push Track Trigger Long Barrel Barrel+ EndCap New Tracker (silicon and pixels) Endcap/Forward Calorimeters New EE Extend HE longevity: similar or new active elements - same absorber - can increase granularity Retrofit HFNew HF Extending muon eta range is an option New EE and HE - new absorber - extend eta range Scenario 0 and options: No increase in L1 rate and latency 3 Muons Complete 1.6<eta<2.4 with GEM/GRPC Concerns: Trigger entirely dependent on Track Trigger (is this enough?) FE electronics must operate past 2035 Need to demonstrate Track trigger < 6.4 µs - all forward detector options

Extend pixel eta range is an option Precision timing added to new calorimetry is an option under consideration, depends on studies and R&D L1 Trigger Upgrade Track-Trigger Push/Pull Track Trigger Long Barrel Barrel+ EndCap EE/EB FE 10µs 500kHz CSC DCFBB 20µs 500kHz DT ROB/ROS 20µs 1MHz New Tracker (silicon and pixels) Endcap/Forward Calorimeters New EE Extend HE longevity: similar or new active elements - same absorber - can increase granularity Retrofit HFNew HF Scenario 1 and options: Increase L1 Rate and latency 4 Muons Complete 1.6<eta<2.4 with GEM/GRPC -New EB electronics - New EE - extend longevity of HE/HF (cost optimization) -Option for pull trigger - new Muons electronics for further rate and latency increase …

Extend pixel eta range is an option Precision timing added to new calorimetry is an option under consideration, depends on studies and R&D L1 Trigger Upgrade Track-Trigger Push/Pull Track Trigger Long Barrel Barrel+ EndCap EE/EB FE 10µs 500kHz CSC DCFBB 20µs 500kHz DT ROB/ROS 20µs 1MHz Tracker Replacement (silicon and pixels) Endcap/Forward Calorimeters Extending muon eta range is an option Scenario 2 and options: also replace EE and HE extend eta range 5 Muons Complete forward with GEM/GRPC Replace EE and HE extend eta range -New EB electronics, new EE, new HE, enhanced performance in forward region -Option to extend muon coverage (also requires option for tracking at high η?)

Document on phase 2 cost and scope exercise o Internal document for July 29 MB/FB and then release to the collaboration – Baseline scenarios & options (with cost scales), plus targeted R&D and simulation studies – DESY week to motivate scenarios and options and to cut branches Physics motivation and detector requirements Detector longevity and sustainable integrated luminosity (LS3 delayed, staging) Feasibility of upgrades (Track trigger latency - retrofit of forward calorimeters…) include consideration on technologies, need for R&Ds and issues at P5 Simulation studies and preliminary performance results (narrow options include some in baseline scenarios?) Size of effort/resources needed Impact on shutdown plan/duration Cost estimate  Each Project, Working group, PC, TC & Cross-coordination should draft a few pages on these points by the end of DESY week- to form the basis for the document  DESY week will be summarized at the following WGM for the collaboration o Simulation studies: – Goal for preliminary performance results by the ECFA workshop in Oct. Further motivate scenarios and options (define priorities) o Document for the RRB to the MB in Sept. 6