1. SiD Collaboration Meeting SLAC, December 2011
SiD - Engineering
Marco Oriunno, SLAC

2. General Considerations
Mechanical Engineering for SID has limited FTEs, not dissimilar from the general situation in ILC.
Leverage on resources available in the GDE/IDAG Common task groups :
MDI
Engineering Tools
CFS
Main focus on Global Issues:
MDI (Push-Pull, Vibrations, Experimental Area)
Forward Region
Cryogenics/Solenoid
Integration

3. Ad-hoc Engineering Meetings around LC Workshops and Collaboration Meetings:
ILD Coll. Meeting Paris, May 2011
ARUP London, July and Dec. 2011
SLAC Pre Meeting Dec.12-13
20 Participants
15 talks on QD0&Cryogenics
Special session on the Japanese-Mountain Site
Refer to the Summary Talks in this workshops
Y.Sugimoto (Japanese mountain Site)
V.Kuchler (Americas vertcial Shafts)
W.Craddock (Magnet and Cryogenics)

4. ….the final goal is contributing with coherent and interesting chapters to the TDR and DBDs……

5. Experimental Area – Americas Vertical Shafts
M.Oriunno, Eugene, Or Nov.2010

6. Experimental Area – Japanese Mountain Site
Helium Compressors
200 t + 20 t
11 m
Surface
9 m
Loading Area
Dampimg
Ring

7. Iron Barrel Yoke layout
Bolted assembly, 144 plates 200 mm thick, 40mm gap
Opportunity to make blank assembly at the factory before shipping
Preliminary Contacts with Kawasaki Heavy Industries
Plate thickness tolerance for each: 0.1mm
Plate flatness: 4mm (in a plate)
Fabrication (assembling & welding) tolerance: 2mm
Full trial assembly: capable (but need to study)
3990 tons

8. Iron Door Yoke, Bolted assembly, no vertical split
1878 tons
Uses continuous cast steel plates rolled to 200 mm thickness
40mm gaps for muon identification chambers
Plate-to-plate spacers are staggered for better muon identification coverage
Bolted construction
100mm thick inner support cylinder

9. Solenoid with integrated dipole
Coil assembly, Surface

10. Interface HCAL - Solenoid
Current Model :
40 x (20 mm SS plates + 8 mm gap) +
20 mm support structure
The Solenoid Inner radius move of 25 mm
From 2591 mm to 2616 mm
..additional hoop stress on the SC Cable

11. First idea (~2006) detector A detector B may be accessible during run
Platform for electronic and services. Shielded. Moves with detector. Isolate vibrations.

12. Mandatory requirements
Trade off study - Conclusion
SiD with Platform
ILD withPlatform
Mandatory requirements
SiD
ILD
Design Change Impact
None
High
Vibrations Amplification
Low

13. Conclusion
Can achieve disp limits of +/-2mm when moving
Limits n/a when un-slicing
But props/shims will be needed under tracks when un-slicing to avoid a step
Acceptable deformation level 3D structure effects are considered
2D Invert Deformations

14. Max. Integrated displacement: 50 nm > 5 Hz
Vibrations
Most acute luminosity loss mechanism due to relative jitter of final focusing magnet elements : Ground Motion and Mechanical vibration sources
ILC has Active Fast Feedback based on beam trajectory after collision
Max. Integrated displacement: 50 nm > 5 Hz
98%
G.White
96%
G.White
Lumi loss due to beam offset in SD0 (beamsize growth) and IP misalignment of beams

15. The CMS Plug 15

16. Integrated Displacement (r.m.s.)
Experimental Vibration measurements – CMS Plug
Exp.PSD
Simulations
Integrated Displacement (r.m.s.)
Damp. 2%
Damp. 4%
Damp. 6.5%
Large uncertainty on the experimental damping ratio : material & system

17. Experimental Vibration Analysis of concrete slabs
K.Bertsche, J.Amann, A.Weidemann

18. Measurements on EX-6 Block
A common SLAC shielding block
Detailed drawings available
Fundamental bending mode calculated to be ~35 Hz
Measurements:
On concrete floor (SLAC End Station A)
Three-point support under block (to avoid rocking)
Two identical steel blocks under one end, one under other end
Validate modeling of ILC platform vibrations
Compare simulation to measurement
Test various representative configurations

19. Pads and Rollers

20. Comparison of Air Pads - Rollers
Min 50 required
Min 18 required
No hardened track->can accommodate minor steps
Specialist hardened and flattened track
Design for 1% friction
Design for 3% friction
Pressure infrastructure
Larger propulsion infrastructure
Run-away
Higher friction ->less run-away
Extra complication of air system

21. Grip Jacks for Air pads
Self Driven Rollers
Both Airpads and Roller solution are feasible
SID prefers Rollers
Grip Jacks for Rollers
Hydraulic push-pull

22. BONUS

23. Part
Tons
Barrel Ecal 60
Barrel Hcal
450
Coil
192
Barrel Iron x 8 (1/8)
3287 (411)
Total Barrel
3990
Endcap Ecal 8
Endcap Hcal 38
Endcap Iron
1833
Total EndCap x1
1878
Total SiD
7746