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

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

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)

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

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

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

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

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

Solenoid with integrated dipole Coil assembly, Surface

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

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

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

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

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

The CMS Plug 15

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

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

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

Pads and Rollers

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

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

BONUS

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