Muon preparation for the Phase 2 TP

1. Muon preparation for the Phase 2 TP For discussion: • What was shown at the upgrade plenary Weds. • Discuss the outline of the muon TP section • Additional thoughts

2. Recap of muon Phase 2 plans • Three main aspects (details in backup slides): • Aging studies, replacement • GIF++ tests for CSC and RPC chamber aging, DT components • Freon replacement for RPC gas after LS3 • DT minicrate replacement • Forward muon trigger and redundancy • GE1/1 and GE2/1 based on improved L1 trigger, redundancy in the most intense region • RE3/1 and R4/1: timing for background rejection and PU mitigation • Forward muon tagging extension (ME0) • Large eta coverage (~2.1-4.0) for big acceptance, S/N boosts in modes with muon • Hermeticity for modes excluding muons

3. High Rapidity Muon (HRM) layout • Proposed at ECFA workshop, Oct. 2013

4. Organization for the muon part of TP • Mindful of the very compressed timescale … • 1 mo (mid-Jan.): Detector conceptual designs frozen for physics perf. • 3 mo (late-March): First draft of sections, plans to complete • 5-6 mo (early July): Full draft to internal readers • …muon IB approved yesterday a simple organizational structure just for preparing the muon part of the TP • A single coordinator (JH) for both main aspects: • Consolidation of the existing detector • High eta detector extensions • Contact persons to coalesce the various aspects of the muon TP • Names to be announced in ~1 week

5. CONSOLIDATION roadmap CSC • Chamber longevity • Radiation tolerance • FE longevity / rate capability; back-end electronics • Workplan of tests to be performed; milestones • Trigger primitive generation • Expected performance - Pile-Up ; simulations; degradation scenarios • Cost of interventions DT Muon Upgrades TP Coordination RPC -- Consolidation of existing detector -- High eta detector extensions

6. Muon Upgrades TP Coordination HIGH ETA EXTENSIONS -- Consolidation of existing detector • What needs? • What constraints? • Integration in CMS? Si-Tracking? Calorimetry? • What options? Costs? Priorities? • Workplan; organization; schedule -- High eta detector extensions Simulation, Physics, trigger New Detectors and R&D Electronics R&D Integration into CMS; infrastructure Costing

7. Muon Upgrades TP organization CSC Contact persons supervise the writing of muon TP parts, report to muon TP Coordination DT Muon Upgrades TP Coordination RPC -- Consolidation of existing detector Simulation, Physics, trigger -- High eta detector extensions New Detectors and R&D Electronics R&D Integration into CMS; infrastructure Costing

8. TP muon section planning • Modeled somewhat after the organization of the 1994 overall TP for the CMS detector • Integrate this with the organization chart • Pages: • Aim for nearly 60 pages on a 1st draft • Subsequently fit it into 30 pages as requested • Put much information into CMS notes that can be referenced – needs discussion

9. TP muon section outline (part I) 1. Introduction: main motivation and goals for upgrade, outline of the section ~2 pp 2. Phase 1 detector longevity ~10 pp: 2.1 DT (electronics), including R&D needed 2.2 CSC (chamber aging), including R&D needed 2.3 RPC (gas), including R&D needed 3. High eta detector extensions – overall design ~3 pp 3.1 Detailed motivation for new detectors (simulations, trigger) 3.2 Design considerations 3.3 Detector overview 3.4 Infrastructure requirements 4. The GEM detectors within existing coverage (GE1/1, GE2/1) ~4 pp 4.1 System overview 4.2 GEM detectors 4.3 On-chamber electronics 4.4 Electronics layout 4.5 R&D needed

10. TP muon section outline (part II) 5. The advanced RPC detectors within existing coverage (RE3/1, RE4/1) ~4 pp 5.1 System overview 5.2 Advanced RPC detectors 5.3 On-chamber electronics 5.4 Electronics layout 5.5 R&D needed 6. The eta extension ME0~3 pp 6.1 System overview 6.2 High granularity detectors 6.3 On-chamber electronics (if different from GE1/1 etc.) 6.4 Electronics layout 6.5 R&D needed 7. Performance estimates ~2 pp 8. Project planning (or does this belong in a later section of the TP overall?) ~2 pp 8.1 Organization 8.2 Timescale for R&D and production 8.3 Plans towards TDR 9. Cost estimate ~2 pp

11. Coordination • Physics coordination to “drive” the physics discussion for muons • Significant interplay with trigger upgrade section • Significant interplay with endcap calorimeter (geometry, infrastructure) • Need to coordinate with GE1/1 TDR as well as active GEM meetings (as well as muon sim, DT, CSC, RPC meetings)

12. Next steps • Fill the contact person positions (~1 week) • For efficiency, mostly 1 name/box… some deserving individuals will be left out  • Expect to use Monday 5 p.m. General Muon Meeting for • A) high eta extension discussions • B) existing detector consolidation discussions • Given the schedule, defining the detector parameters and right simulations is highest priority • ME0 is most interesting: space in Z (thickness), rapidity coverage 2.1-4.0 or ??, number of layers, granularity, polyethylene, steel shielding? Friday 9:00 in Salle A: a special “phase 2 ad hoc muon” meeting (apologies to Physics plenary): https://indico.cern.ch/conferenceDisplay.py?confId=288056

13. Additionally • Would like to create “muon phase 2” email list, hypernews forum • Need to optimize meeting-ology • Try to avoid existing DT, RPC, CSC, GEM meetings • Combine some meetings? • Request meeting room space? • Decisions on scope and important branch points: • Will be discussed in muon IB, seek unanimity… • but upgrade management has decision power (Tiz)

14. Backup slides

15. Longevity of Phase 1 Muon systems • Measured rates are linearly increasing with luminosity and with a strong η dependence as expected from simulation • No aging effects have been observed so far • Test have been performed up to 0.3 C/cm - only forward CSC station will exceed this limit after 3000 fb-1 - new tests including readout will be performed at the GIF++ facility to confirm aging properties of all systems •  The muon systems are expected to sustain 3000 fb-1 Integrated charge collected in CSCs after 3000 fb-1 0.3 C/cm limit tested • Construction tests of the radiation damage to FPGAs in the DT read-out indicate that they need to be replaced for Phase 2 operation • The new electronics design will not limit the L1-trigger rate

16. DT Minicrate replacement • There is a host of reasons for minicrate replacement: • ASICs and boards will be very old • Radiation tolerance is questionable – needs investigation • Bandwidth is limited to 300-500 kHz • Interventions are very delicate • Power consumption is high • Performance with high background rates can be much enhanced • No “sound bites”, but the totality is a pretty strong case (Cristina) First level of DT read-out and trigger

17. Example: L1 rate limitation 300-500 kHz Estimated occupancy region

18. GE1/1: trigger motivation • The leading motivation is to improve muon triggering in this region • Rate reduction from bending angle and increased efficiency from added redundancy

19. Bending angle and multiple scattering • Practically no sensitivity away from zero in YE3 and YE4 • ME0 (YE-1) has the best separation from zero • Some gain still expected from bending angle in GE2/1 • RE3/1,4/1 no use from bending angle==> use them only for redundancy • ==> next slides focus on bending angle information New simulation results (Krutelyov)

20. ME0-ME1/1 bending for eta 2.14-2.4 close far • “Close” chambers have worse separation, still pretty good • Bending angle works really well in ME0 (not as good as GE1/1 though) New simulation results (Krutelyov) Tools used: fast simulation with CSC sim hits — propagate CSC sim to GEM layer — emulate detector channel resolution — compute bending angle

21. GE2/1-ME2/1 bending close far • GE2/1 can give 40% decrease in trigger rate for 2.14-2.4 New simulation results (Krutelyov) Tools used: fast simulation with CSC sim hits — propagate CSC sim to GEM layer — emulate detector channel resolution — compute bending angle

22. Trigger rate reduction: summary New simulation results (Krutelyov) ~4.5