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
16 Feb 1999
F Harris LHCb Trigger Meeting

2. Global considerations for placement of electronics and cables
We are assuming no radiation worries on perimeters 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)
16 Feb 1999
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
16 Feb 1999
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
ECAL
HCAL
TOTAL
POSITIONING and INDEPENDENCE
On top of calorimeters
HCAL independent of ECAL+PRESHOWER
CABLING
In the vertical plane - bottom to the top
16 Feb 1999
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)
16 Feb 1999
F Harris LHCb Trigger Meeting

6. F Harris LHCb Trigger Meeting
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 Gbit links m.?
ECAL to HCAL Gbit links m. ?
Links to Selection crates Gbit links up to 30m.
16 Feb 1999
F Harris LHCb Trigger Meeting

7. F Harris LHCb Trigger Meeting
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 (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
‘short’ ECAL-ECAL
‘medium’ PAD-ECAL, PS-ECAL
‘long’ HCAL-ECAL
16 Feb 1999
F Harris LHCb Trigger Meeting

8. Proposal for Muon Detectors on-detector electronics (OR logic)
~26 1/2 width 9U crates (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
16 Feb 1999
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)
~ Gbit links from OR logic to to FEBIs (each handling 32 channels)
Length 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
16 Feb 1999
F Harris LHCb Trigger Meeting

10. F Harris LHCb Trigger Meeting
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
Rich
Rich (35) (40)
Ecal (35) (40)
Hcal (30) (35)
Muon (30) (35)
These estimates reflect the 1st iteration (+- 1 m.)
16 Feb 1999
F Harris LHCb Trigger Meeting

11. Summary of some System characteristics of Level-0 trigger proposals
Calorimeter triggers
Option Crates Location Link
3D ? ?
Bologna On det ~5000(including det links)
Orsay Balcony ~1000 (475*10m+)
Muon trigger
Option Crates Location Links
3D ? ?
Marseille / Balcony/Far ~100*5m.
Gatchina ? ? ?
16 Feb 1999
F Harris LHCb Trigger Meeting

12. Placement of Muon and Calorimeter Electronics
Muons
Location Function Crates Input Cables
Chamber side OR logic *1/2 9U ~200 K (up to 11m.)
Balcony/Far FEBIs *9U ? ~2K (up to 40 m.)
Calorimeters(ECAL+HCAL+PRESHOWER)
Top ECAL+HCAL A/D *9U
16 Feb 1999
F Harris LHCb Trigger Meeting

13. Placement of MUON electronics
16 Feb 1999
F Harris LHCb Trigger Meeting

14. F Harris LHCb Trigger Meeting
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
16 Feb 1999
F Harris LHCb Trigger Meeting