1. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 1 ECAL End Cap CMS ECAL End Cap Engineering Design Review. EDR meeting held 28 November to 29 November 2000 at CERN Prepared by A.B.Lodge. EE VFE Electronic Readout System.

2. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 2 ECAL End Cap EE VFE Electronic Readout System. Talk Structure. EE Light to Light Readout Chain. EE Specific Constraints. EE Design Proposal for VFE Electronic Readout. Layout & Routing of Internal Services.

3. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 3 ECAL End Cap EE VFE Electronic Readout System. CRYSTALVPT HV CARDS UMBILICAL PREAMPFloating-Point ADC Fibre-Transmitter Energy > Light Light > Current Current > Voltage Voltage > Bits Bits > Light CMS ECAL End Cap On-Detector Light-to-Light Readout. SCsReadout Cards

4. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 4 ECAL End Cap EE VFE Electronic Readout System. EE Specific Constraints. The aim of the EE design team is to utilise as much of the readout equipment developed for the EB as possible. The EE has several specific constraints: Radiation Levels Limited Space between Back Plate of EE and HE Longer Signal Leads (between VPTs and Pre - amps). No direct mapping between Readout Electronics and SCs. Difficult Access to Patch Panels. Direct implementation of the EB readout scheme on the EE is not possible.

5. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 5 ECAL End Cap The EB 10 - Channel Electronic Readout Modules. The EB are proposing to use 10-Channel Electronic Readout Modules as their basic building block in providing VFE Electronic Readout for the ECAL Barrel. These Modules will contain: One 5-Channel Master Electronic Readout Card. One 5-Channel Slave Electronic Readout Card. The Master readout card will contain additional circuitry and Optical Fibres to provide the control interface for the complete readout module. Thus enabling the module to communicate with the Upper Level Readout System. EE VFE Electronic Readout System.

6. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 6 ECAL End Cap EE VFE Electronic Readout System. EB - 10 Channel Electronic Readout Module.

7. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 7 ECAL End Cap EE VFE Electronic Readout System. EE VFE Electronic Readout Design Proposal. The EE design will combine 5 * 10 Channel Electronic Readout Modules to form a 50 Channel Electronic Readout Unit as its basic building block (serving 2 SCs). Effective Use Of Space. 95% Of Coverage. Create Space For Internal Service Routing. Easy of Maintenance. Standardisation. Special arrangements will be required to provide VFE Electronic Readout for the deconstructed crystals, placed on the inner and outer periphery.

8. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 8 ECAL End Cap The EE 10 - Channel Electronic Readout Modules. The EE will require a small number of modifications to the EB 10-Channel Electronic Readout Module design. The modifications will include : Longer Side Covers (~ 6mm). An additional Metal Fixing Plate. No Heat Pipes. No High Voltage connector. Rotation by 90 degrees. EE VFE Electronic Readout System.

9. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 9 ECAL End Cap EE VFE Electronic Readout System. EE - 10 Channel Electronic Readout Module.

10. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 10 ECAL End Cap EE VFE Electronic Readout System. EE - 50 Channel Electronic Readout Unit.

11. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 11 ECAL End Cap EE VFE Electronic Readout System. The ECAL End Cap Internal Services. The ECAL End Cap VFE 50 Channel Electronic Readout Units will require the following Internal Services: Umbilical Cable Assemblies. Digital Readout Fibre Optics. Low Voltage Supply Cabling. High Voltage Supply Cabling. Electronic Readout Cooling System.

12. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 12 ECAL End Cap EE VFE Electronic Readout System. Sectional view of part of an ECAL End Cap Quadrant. HE EE Back Plate EE Patch Panels

13. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 13 ECAL End Cap EE VFE Electronic Readout System. End Cap Back Plate. Back Plate Cooling & Fibre Optic Monitoring System. High Voltage Cable Assemblies. Front Moderator. Low Voltage Cables Assemblies. I/P Signal Termination Cards & Umbilical. Electronic Readout Cooling Plates. 50 Channel Electronic Readout Units. Rear Cooled Moderator. 50 80 133 338 60 53

14. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 14 ECAL End Cap EE VFE Electronic Readout System. View Showing One EE Quadrant. 50 Channel Electronic Readout Units (34). Service Highways for Digital Readout Fibre Optics.

15. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 15 ECAL End Cap EE VFE Electronic Readout System. Low Voltage Cable Assemblies - 20 Core. View Showing LV Cable Routing. Patch Panel Connectors (SMS Qikmate). Note: All LV Cabling will be routed in a specific Service Void.

16. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 16 ECAL End Cap EE VFE Electronic Readout System. View Showing HV Cable Routing. High Voltage Cable Assemblies - 7 Coaxial Cables/Assembly. Patch Panel Connectors - Weald Electronics BA Range (15 Pin ). Local High Voltage Distribution Units. Note: All HV Cabling will be routed in a specific Service Void.

17. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 17 ECAL End Cap EE VFE Electronic Readout System. HV Filter Card, plus Termination Card (SC Umbilical Assembly).

18. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 18 ECAL End Cap EE VFE Electronic Readout System. Super Crystal fitted with Prototype Umbilical.

19. CMS ECAL End Cap EDR Meeting CERN 28 Nov. to 29 Nov 2000 A.B.Lodge - RAL 19 ECAL End Cap Continuing Development Programme. There are still a number of outstanding issues regarding the EE VFE Electronic Readout Design. These will require further investigation before a final design proposal can be presented. The development programme will include: –Continuing with the Thermal Analysis of Electronic Readout. –Finding the best Digital Fibre Optic solution for Readout System. –Finalising the Design/Manufacture & Testing of the 2000 Metal Model. –Continuing to develop the EE Wooden Quadrant Mock-up. EE VFE Electronic Readout System.