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ME0 Baseline – Design, Project Planning & Execution –

ME0 Baseline – Design, Project Planning & Execution –. Marcus Hohlmann Florida Institute of Technology. Comprehensive Review – Phase 2 Muon Upgrade, CERN, June 28, 2016. Outline. Motivation Performance requirements Status of baseline design Schedule, milestones, project planning

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ME0 Baseline – Design, Project Planning & Execution –

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  1. ME0Baseline– Design, Project Planning & Execution – Marcus Hohlmann Florida Institute of Technology Comprehensive Review – Phase 2 Muon Upgrade, CERN, June 28, 2016

  2. Outline • Motivation • Performance requirements • Status of baseline design • Schedule, milestones, project planning • Summary M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  3. ME0 muon detector in CMS New nose of CMS endcap: Services for HGC/BH Services for ME0 High Granularity Calorimeter (silicon) Backing Hadron Calorimeter (scintillator) elm. had. 6 ME0 chambers M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  4. ME0 motivation M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  5. Motivation for ME0 Charge 2b • Extends muon coverage to |η| < 2.82 • Tags high-η tracks/calorimeter objects as muons • Increases acceptance for physics with muons, e.g. by ~ 20% for H → ZZ → 4µ channel • Triggering muons with ME0 in its lower-η section 2.03 < |η| < 2.5 looks possible • GE1/1 covers up to |η| ~ 2.15 • ME0 restores muon trigger performance from |η| ~ 2.15 to full original muonendcap envelope of |η| ~ 2.5 HGCAL & BH M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  6. Trigger enhancement Charge 2b • Low magnetic field causes an explosive growth of the CSC muon L1 trigger rate towards high  • Mismeasured low-pT muons cause L1 rate to blow up • Muon direction measurement with GE1/1ME1/1 chambers decreases L1 rate substantially • But limited to the region || < 2.15 ! L1 muon candidate  • Solution: use ME0 stubs to repeat GE1/1 trick • This will restore L1 muon trigger capabilities in the entire original design envelope of || < 2.5 M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  7. ME0 performanceRequirements M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  8. Minimal performance requirements • Discriminate muons from n,  backgrounds • Find muon stubs among background hits at rates up to 30 kHz/cm2 • Handle overall particle rates comfortably (det. & electronics) • Expected max. tot. hit rate from simulation: 30 kHz/cm2 (near |η| ~ 2.8) • Expected max. total chamber hit rate: 50-100 MHz • Resolve hit positions about as well as GE1/1 • Azimuthal resolution: σφ~ 300 µrad • Radial () resolution: σr ~ 1-3 cm (-dependent) (these estimates are starting points for simulation group; to be finalized) • Resolve hit time sufficiently for clear BX association • Timing resolution: σt < 8 ns • Minimize discharges and aging effects • Survive for 10 HL-LHC years These requirements are the main drivers of the ME0 design Charge 3 ~ M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  9. ME0 muon segments Background hits In analogy with the six-layer cathode strip chambers, six layers of ME0 chambers are expected to provide sufficient information to efficiently identify muon segments among background hits. Muon hits φ Six ME0 chambers M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  10. Background flux & rate Charge 3 Particle flux ME0 needs to handle a hit rate of 1- 30 kHz/cm2 Max. flux in innermost ME0 section Hit rate Convolute with ME0 sensitivity to different particle types using GEANT Now incorporates proper FLUKA treatment of HGCAL and BH in front of ME0 M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  11. Resolutions Charge 3b • ME0 fulfills similar function for L1 muon trigger as does GE1/1 (stub bending measurement relative to ME1/1 CSCs) • => Requirements for ME0 space and time resolutions are similar to those for GE1/1 • Resolve azimuthal position φME0 sufficiently for appropriate Δφ = φME0-φME1/1 measurement (given the rate environment): • Azimuthal resolution: σφ_ME0 ~ 300 µrad • Radial resolution: σr ~ 1-3 cm • Resolve hit time sufficiently for clear BX association of hits: • Timing resolution: σt < 8 ns • Exact specifications still under study with reconstruction and trigger simulations ~ M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  12. ME0 Status of Baseline design M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  13. Baseline: Triple-GEMs ME0 stack: 6 layers of Triple-GEM chambers Triple-GEM chamber (similar to GE1/1) 6 layers of Triple-GEM chambers very similar to the GE1/1 chambers are expected to satisfy all minimum requirements and consequently constitute the baseline design for ME0: M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  14. ME0 baseline design Charge 3d ME0 baseline design closely follows the GE1/1 design: • Triple-GEM detectors w/ 3/1/2/1 mm electrode gaps (as GE1/1) • Coverage: 2.03 < |η| < 2.82 • 20-degree chambers (vs. 10-degree chambers for GE1/1) • Chamber construction & assembly very similar to GE1/1 • Chamber dimensions slightly smaller than GE1/1-S chamber • 6 chambers in one ME0 stack (module) • 18 stacks per endcap; 36 stacks total • 216 chambers, 648 GEM foils required (50% more than GE1/1) M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  15. Constraints on design Charge 3c Main constraints: • endcap calorimeter constrains space available for placing ME0 chambers; limits number of ME0 layers to six layers • no access after installation due to calorimeter services 20.5 cm M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  16. ME0 insertion into endcap nose Charge 5 In order to assure overlap between two adjacent detectors, stacks will be installed alternating front and back sides of stacks: front back M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  17. ME0 chamber overlap Charge 5 Adjacent stacks overlap by 6.5 cm to ensure hermetic coverage Detector overlaps M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  18. Baseline electronics design Charge 5 One opto-hybrid per chamber • ME0 baseline electronics design closely follows GE1/1 electronics design: • Current design uses 8η× 3φreadout sections; exact segmentation under study, to be finalized • 5184 (24 x 6 x 36) binary front-end chips (VFAT); 128 channels (strips) per VFAT • 216 opto-hybrids w/ 24 VFAT inputs each • 1 GEM Electronics Board (GEB) per chamber, 6 GEBs per stack; 216 GEBs total for ME0 system readout section (128 strips) 24 VFAT 1 GEB  φ M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  19. Validation & completion of baseline Charge 6 • Remaining design validation steps: • Confirm resilience against discharges • The number of discharges is to be minimized • Discharges that do occur should not have any ill effects on the long-term detector operation (non-destructive) • Accumulate sufficient charge in GIF++ aging test • Need to accumulate 0.6 C/cm2 while monitoring gain • Completion of component design: • All component design closely follows GE1/1 design • Produce actual design drawings of components • GEM foils, drift and readout PCBs, frames, GEBs, … M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  20. Discharge test with Triple-GEMs Charge 6 • Accumulation of 450 discharges over a few cm2. However, conditions quite different from those in CMS. • Observations: • Discharges are non-destructive • No impact on gain • Thin deposition of copper oxide in the irradiated region (all GEM foils) • Superficial copper etching near the rim of the holes • These do not affect the detector operation • In CMS, for ME0 we expect ~1.5 × 10-5 discharges s-1cm-2, or ~ 5 × 10-5 discharges per second over a few cm2, or one discharge every ~2 × 104 seconds over a few cm2. • => The test corresponds roughly to 9 × 106 s of running in CMS, i.e. 15% of the total expected up-time of 6 × 107 s of the HL-LHC over 10 years. Caveat: There are large uncertainties in these estimates! Conclusion: Promising, but need to revisit estimates and do more tests to reach 10 HL-LHC equiv. years. If this indeed poses a problem, investigate mitigation. M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  21. R&D for baseline optimization Chimney housing services Charge 5 Addressing the space constraint chamber 1 By coupling two adjacent chambers using a single double-sided drift PCB, it might be possible to remove three of the six PCB from the stacks and to reduce the stack thickness by about 6-10 mm. R&D for this back-to-back design (B2B) is ongoing with prototypes. drift gap drift gap chamber 2 GEB RO PCB Drift PCB ~ 18 mm RO PCB GEB ~ 40 mm ~ 18 mm M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  22. Back-to-back GEM rates Charge 5 • Measurements performed on 10×10 cm2 back-to-back prototype with 109Cd source • Placing the source in different positions (red markers below) on the active window to test the operation of the entire active area Both sections of the detector work properly reaching rate plateaus. M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  23. Back-to-back GEM beam test Charge 5 Preliminary results from run at H2 test beam: • Readout with four VFAT2 chips (40 MHz sampling) • Timing resolution ~10ns is comparable to GE1/1 Back-to-back GEM Tracker GEM Tracker GEM Ar/CO2 70:30 Time resolution (ns) Timing scintillator M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  24. System demonstration Charge 6 • A first ME0 demonstration is essentially accomplished with a successful GE1/1 slice test since the ME0 design follows the GE1/1 design closely • What remains to be done after that is the assembly of a complete ME0 stack fully integrated with electronics and all services M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  25. Detector production steps Production steps are analogous to GE1/1 production: ME0 stack Assembly M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  26. Detector production Charge 8 • Tooling and setups (X-ray, copper boxes, cosmic ray stand) prepared for the GE1/1 production can be reused for ME0 production and tests. • Crew trained for the production and test of the GE1/1 can easily move to the production and commissioning of the ME0 baseline detectors. • Production sites “certified” for the production of GE1/1 chambers don’t need to be certified again. • Production of ME0 modules can be seen ascontinuation of the GE1/1 and GE2/1 chamber production • The new CMS GEM clean room, in preparation in bd. 904 (Prevessin) will be large enough to host the assembly of the ME0 stacks. M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  27. ME0 project planning,Schedule& milestones M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  28. Complete ME0 Merlin schedule Charge 8 For reference only M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  29. Schedule towards TDR Charge 8 2017 2016 All R&D up to TDR TDR M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  30. ME0 Production schedule Charge 8 M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  31. Schedule drivers Charge 8 • Detector production stages are staggered • Separate production lines for module assembly and assembly of final installation unit (GE1/1 superchamber; GE2/1 chamber; ME0 stack) • Schedule drivers (stars indicates “conservative” estimates): • GE2/1 and ME0: module production followed by GEM foils • Electronics development • Becomes a schedule driver if development beyond VFAT3 is needed M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  32. ME0 high-level milestones Charge 8 M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  33. Summary & Conclusions • Triple-GEM detectors constitute the ME0 baseline; they satisfy all basic performance requirements • Remaining issues are experimental validation of resilience against aging and discharges • The ME0 chamber and electronics designs follow the GE1/1 design very closely => We know how to build these detectors • Main design constraints are from tight spaces and limited access in the muon endcap • R&D is being done to slim down chambers a bit • ME0 detector production is anticipated to follow directly on heel of GE1/1 and GE2/1 production M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  34. Thank you! M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  35. BACKUP M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

  36. Performance - big picture M. Hohlmann, ME0 Baseline Detector Design, Comp. Review Phase 2 Muon Upgrade, CERN

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