1. End-cap Mechanics FDR Overview of the Project
Debbie Greenfield, RAL
1 November 2001
CLRC

2. End-cap Mechanics FDR - Agenda
Today:
Overview - aims of the review
Requirements
Baseline Design, summary of the overall design
Presentations of each major area being reviewed - lots of opportunities for questions
Tomorrow:
Discussions among reviewers
Feedback
CLRC

3. End-cap Mechanics The obvious stuff!
2 SCT End-caps fitting inside the 2 TRT End-caps
Physically, electrically and thermally isolated from all other components (apart from the 4 fixation points)
Major Components of End-cap Mechanics:
Support Wings - either end of the End-cap (also form part of the thermal enclosure. Attach to squirrel cage of the TRT.
Outer Thermal Enclosure Cylinder - between the SCT support cylinder and the TRT
CLRC

4. End-cap Mechanics The obvious stuff! - continued
Inner Thermal Enclosure Cylinder - between the Pixel support tube and the inner bore of the SCT.
Support Cylinder - supports the discs in position. Supports the services. Rigidly connected to wings.
Disc Fixings - hold discs in support cylinder
Bare Discs - 9 in each End-cap
Disc Inserts - provide z location for cooling blocks
Cooling blocks - also provide location for modules
CLRC

5. End-cap Mechanics The obvious stuff! - continued
Cooling pipes - C3F8 evaporative cooling
Low Mass Power tapes
Optical fibre harnesses
Patch panels - PPF0 on disc, PPF1 at end of cryostat
CLRC

6. End-cap Mechanics FDR - Module Situation
K4 module does not meet electrical performance specification - it will not be used in the final detector
Two options:
K5 - mechanically almost identical to the K4, can use baseline mechanics design with minor mods
KB - based on barrel hybrid, mechanically very different to K4, would need complete redesign of cooling circuitry. However, could still keep same support cylinder, wings, thermal enclosures and bare discs.
Design presented for FDR is based on K4
CLRC

7. End-cap Mechanics FDR - Aims
To review and approve the design of:
Support cylinder, support wings, outer and inner thermal enclosure cylinders and discs
To review the existing design and freeze interfaces to the above of:
Disc inserts, disc fixings
Cooling pipes and blocks
Low mass power tape layout, opto fibre layout
Patch panels PPF0
Alignment and DCS components and fixings
CLRC

8. End-cap Mechanics FDR - Aims
To review:
Assembly procedures (mostly only conceptual at this stage)
Grounding and shielding plan
End-cap material distribution
End-cap layout
Interfaces to End-cap modules, SCT Barrel, End-cap TRT and Pixels
CLRC

9. Post-FDR Plan Deal with any design concerns arising from review
Freeze interface to support structures, thermal enclosures and discs.
Complete detail design, manufacturing drawings and specifications
Proceed to PRR and tender as soon as possible.
Delay detail design and tender on all on-disc services until module status clear
CLRC