Update on ‘Real estate’ for Level-0

1. Update on ‘Real estate’ for Level-0 Global considerations for placement of electronics and cables Muon detector and muon trigger options Calorimeters and calorimeter trigger options Summary F Harris LHCb Trigger Meeting

2. Global considerations for placement of electronics and cables • We are assuming no radiation worries onperimeters of muon and calorimeter detectors (get up to date information in electronics/background meetings Wed morning) • Must allow detectors to be opened without uncabling • Cabling ‘no go’ areas • On floor - because of rails • Some overhead areas- racks on top of detectors. Also muon frame suspension? • Accessibility • Detector side of wall - one very short access/day(?) • Far side of wall preferable, if compatible with costs, packaging,latency considerations, and the physics of detectors and links (more on links Electronics meeting Wed morning) F Harris LHCb Trigger Meeting

3. Distances (Detailed routes not shown) Electronics racks (calo) LHCb Behind the wall 30 m 30 m Electronics crates 35 m Lo decision Electronics racks (muon) Electronics racks (muon) TS and TTC 70 m Electronics racks F Harris LHCb Trigger Meeting

4. Crate and cabling for calorimeters(ECAL,HCAL,PS) • Number of 9U CRATES • Sub-Detector Whole Detector Half-Detector • PreShower 8 4 • ECAL 14 7 • HCAL 4 2 • TOTAL 26 13 • POSITIONING and INDEPENDENCE • On top of calorimeters • HCAL independent of ECAL+PRESHOWER • CABLING • In the vertical plane - bottom to the top F Harris LHCb Trigger Meeting

5. Comments on proposed Calorimeter electronics layout • ADVANTAGES DISADVANTAGES • Short ‘inner’ cable lengths(<10 m.) ? Access above calorimeters • Routing above detector Need mobile/removable trays • No cables on the ground (manoeuvring) F Harris LHCb Trigger Meeting

6. Calorimeter Trigger - update on Orsay proposal (information O Callot/I Videau) • Boards and crates (9U)for trigger electronics • Trigger logic for each channel embedded in FE-card. (14 crates of FE-logic for ECAL and 8 for PreShower. 4 crates for HCAL). • Summary Cards for ECAL, PreShower, HCAL embedded in FE-crates • ECAL Selection Crate • HCAL Selection Crate • Location of trigger electronics • Channel logic and Summary Cards embedded in FE-logic on-detector (top) • Selection Crates on balcony (cable distance up to ~30m.) • Links for trigger electronics • PreShower to ECAL (500) ? in the same crate or nearby crate • (backplane or v. short links) • Pad to Preshower 250 1 Gbit links 10 m.? • ECAL to HCAL 100 1 Gbit links 10m. ? • Links to Selection crates 125 1 Gbit links up to 30m. F Harris LHCb Trigger Meeting

7. Calorimeter Trigger - update on Bologna proposal (information M Bruschi) • Boards and crates for trigger electronics • L0 Board handles • 8*4 Ecal channels • 4*2 Hcal channels • 32 PS channels • 64 PAD channels • Number of boards and crates • 192 Boards 14 (7+7) crates(9U) • Location of Trigger electronics (To be discussed this week) • Prefer close to ECAL FE electronics (which is on top of detector) - NOT on balcony • Links • 26/board ~5K links • 3456 ‘short’ ECAL-ECAL • 1152 ‘medium’ PAD-ECAL, PS-ECAL • 384 ‘long’ HCAL-ECAL F Harris LHCb Trigger Meeting

8. Proposal for Muon Detectors on-detector electronics (OR logic) • ~26 1/2 width 9U crates (2*(4+3+2+2+2)) MU1 to MU5 • Positioning • Crates on frame each half-muon plane • Displacements perpendicular beam axis must be independent • Cabling • over the top of detector • ADVANTAGES DISADVANTAGES • Shorter ‘inner’ cables ?Additional mobile platform both sides • No cable on ground ? Mobile/removable cable trays on top F Harris LHCb Trigger Meeting

9. Marseille Muon Level-0 Proposal - updates • FEBIs close to FIP and DMP (cable lengths 4-5 m.) • FEBIs contain ‘off-detector electronics’ I.e. Level-0 and Level-1 pipelines, derandomiser buffer as well as interface to trigger processing • 14 9U crates for FEBIs(each FEBI board handling 256 PADs) • ~1400 1 Gbit links from OR logic to to FEBIs (each handling 32 channels) • Length 34-80 m. - ? COST • Connecting FEBIs to Trigger procesors • Links 4-5 m. • For FIP/DMP connections need ~100 (? Cu, optical) • If connect to 3D will need ~1400 ‘short’ 1 Gbit links • Positioning of FEBIs+Trigger Processors • Strong preference for behind the wall F Harris LHCb Trigger Meeting

10. First estimates for Cable Lengths from detectors to FE electronics on the balconies( D Lacarrere) • Sub-detector Distance to FE crate (m.) • Min Max • Vertex 12 20 • Rich1 10 20 • Rich2 20(35) 25(40) • Ecal 20(35) 25(40) • Hcal 15(30) 20(35) • Muon 15(30) 20(35) • These estimates reflect the 1st iteration (+- 1 m.) F Harris LHCb Trigger Meeting

11. Summary of some System characteristics of Level-0 trigger proposals • Calorimeter triggers • Option Crates Location Link • 3D 3 ? ? • Bologna 14 On det ~5000(including det links) • Orsay 2 Balcony ~1000 (475*10m+) • Muon trigger • Option Crates Location Links • 3D 1 ? ? • Marseille 2/3 Balcony/Far ~100*5m. • Gatchina ? ? ? F Harris LHCb Trigger Meeting

12. Placement of Muon and Calorimeter Electronics • Muons • Location Function Crates Input Cables • Chamber sideOR logic 26*1/2 9U ~200 K (up to 11m.) • Balcony/Far FEBIs 14*9U ? ~2K (up to 40 m.) • Calorimeters(ECAL+HCAL+PRESHOWER) • Location Function Crates Input Cables • Top ECAL+HCAL A/D 26*9U F Harris LHCb Trigger Meeting

13. Placement of MUON electronics F Harris LHCb Trigger Meeting

14. Summary Comments • Proposals evolving - would expect changes following discussions this week at muon, calorimeter and electronics + background meetings. • Must confirm backgrounds acceptable for electronics • Map link technology with costs to proposals • include detailed link ‘handling’ in evaluations • Details of placement of electronics on and adjacent to detectors to be worked out F Harris LHCb Trigger Meeting