1 David Santoyo sLHC OXFORD 17/06/2010 EC Structure Review ? ? ? ? ? ? IFIC-Valencia

2 David Santoyo sLHC OXFORD 17/06/2010 Presented at Nikheff Ws Petals supported by a wheel - Hub and rim of the wheel sustained by a set of radial rods EARLY MODEL: Mass reduction target

3 David Santoyo sLHC OXFORD 17/06/2010 Presented at Nikheff Ws 2008 Overlap in Φ with upper/lower petals CONTROL CARD LOCATION FIXED: - Control Card on the side. No space left at the top (outer radius) - Control Card at the bottom difficulties services connections. - “T-shape” difficulties Control Card cooled down with the return pipe Two Control Cads per petal on same side

4 David Santoyo sLHC OXFORD 17/06/2010 Presented at LBL Mech-Ws 2009 Stiff enough? At least Inner Cylinder (Cone shaped) required ”End insertion”-like concept is complicated for petals: - Control cards on the side “only 1 rail?” - There is no mov. constrain in z (No disk) - Rings separate petals in z even more (Rods Ø) - Build accuracy requirements: r-φ=50um r=200um z=500um

5 David Santoyo sLHC OXFORD 17/06/2010 Presented at LBL Mech-Ws 2009 This would improve considerably the stiffness but…

6 David Santoyo sLHC OXFORD 17/06/2010 Presented at LBL Mech-Ws 2009 What about services?? Risky: multiple obstacles with NO “end-insertion”-like concept

7 David Santoyo sLHC OXFORD 17/06/2010 SB EC Pix EC Service Module Connection Space Characteristic, Repeated 1/16 Arc Segment Poly Moderator Supplement PP1 PCB’s Services: Presented by Neal D. Hartman (Jan.2009)

8 David Santoyo sLHC OXFORD 17/06/ Service channels for EndCap SB EC Pix From Ian Wilmut concept applied to petals Characteristic, Repeated 1/16 Arc Segment

9 David Santoyo sLHC OXFORD 17/06/2010 A single “rail” makes end- insertion easier until the very end of the assembly process… Single guide pin This gap can be reduced depending on the piping and cabling connectors. 16 Service channels for EndCap

10 David Santoyo sLHC OXFORD 17/06/2010 Services: Presented by Christophe Bault (Feb.2009) R=1007R=974

11 David Santoyo sLHC OXFORD 17/06/2010 CMS Benchmark

12 David Santoyo sLHC OXFORD 17/06/2010 CF Inner Cylinder 8 support bars constrain disks Inner cylinder with 4 different diameters to constrain disks and sustain petals Apertures on Outer cylinder to permit services exit Master disk supports entire structure

13 David Santoyo sLHC OXFORD 17/06/2010 CFRP-KOREX Disks 1.- Master Disk + Support bars + Inner cylinder 2.- Disks are assembled into the structure.

14 David Santoyo sLHC OXFORD 17/06/2010 CF Frames

15 David Santoyo sLHC OXFORD 17/06/2010 Lateral Support Beams

16 David Santoyo sLHC OXFORD 17/06/2010 Services Support Rings

17 David Santoyo sLHC OXFORD 17/06/2010 (4/16) Rows of Petals: Insertion

18 David Santoyo sLHC OXFORD 17/06/2010 (4/16) Rows of Petals: Services and Testing 40 petals from 160 (25%)

19 David Santoyo sLHC OXFORD 17/06/2010 (12/16) Rows of Petals: Insertion

20 David Santoyo sLHC OXFORD 17/06/2010 (12/16) Rows of Petals: Services and Testing

21 David Santoyo sLHC OXFORD 17/06/2010 ENDCAP Envelope

22 David Santoyo sLHC OXFORD 17/06/2010 Services & cabling Services estimation includes: -Opto fibers x18 -HV cabling x18 -LV cabling x2 -Inlet and Outlet capillaries -DCS x18 -Al service channel Total per petal (g/mm) 0, Total per Disk (g) Services Disk 1: from z: 2956mm to z: 1376mm19972,5192 Services Disk 2: from z: 2956mm to z: 1476mm18708,43571 Services Disk 3: from z: 2956mm to z: 1744mm15320,69194 Services Disk 4: from z: 2956mm to z: 2141mm10302,28047 Services Disk 5: from z: 2956mm to z: 2791mm2085, Total 5 Disks (g) 66389,66509 Capillaries

23 David Santoyo sLHC OXFORD 17/06/2010 Electrical & Cooling Services Interface Electrical Connectors on top to improve accessibility. Also located at the center to optimize the area for the Control Card on the side. The aim is to reduce the petal width as much as possible.

24 David Santoyo sLHC OXFORD 17/06/2010 Services Connections 2D-Layout: conflictive area at rails CONNECTORS NEED TO BE DEFINED: AT MANIFOLDING PIPES SHOULD HAVE THE SAME IMPEDANCE 1.4m

25 David Santoyo sLHC OXFORD 17/06/2010 Accessible area after services 1.4m 40 petals from 160 (25%) +12 (32,5%) +12 (40%)

26 David Santoyo sLHC OXFORD 17/06/2010 ENDCAP Envelope: Substructure #1 Support Frames Support Beam Disks supports Inner Cylinder

27 David Santoyo sLHC OXFORD 17/06/2010 ENDCAP Envelope: Substructure #2 Rings Services Channels

28 David Santoyo sLHC OXFORD 17/06/2010 Petal Envelope Dimensions 12mm GAP??? >>>>> 7mm GAP??? >>>>> Only element to determine Inner diameter of ring >>>>>

29 David Santoyo sLHC OXFORD 17/06/ Rings for Services; Weights and Clearances ← ≈74mm ← ≈88mm ← ≈242mm ← ≈74mm ≈ 4.4 Kg → ≈ 4.0 Kg → ≈ 3.1Kg → ≈ 2.2 Kg → TOTAL SERVICES = 33.6 x 2 = 67.2 Kg (TOP + BOT) TOTAL nº RINGS = 9 x 2 = 18 (TOP+BOT) Openings

30 David Santoyo sLHC OXFORD 17/06/ Models considered… Real model with openings Equivalent model 12mm GAP? Equivalent model 12mm GAP?-> Real model 12mm GAP?-> Real model reinf. inserts

31 David Santoyo sLHC OXFORD 17/06/2010 Results and Conclusions… For the real model without inserts, the areas where the load is distributed provide about 80% of the deflection because there is not enough rigidity at those areas. This is why the equivalent model is done to avoid the previous situation. The model with Inserts shows the best data it is possible to get, the load is sheared between all nodes in contact with the inserts areas. To achieve a deformation under 5mm is not impossible, but some safety factor must be also considered and it is difficult with current estimations to understand if already there is a safety factor included at the load or not. Results: Outer diameter: 1.007mm Inner diameter: mm Results: Outer diameter: 1.007mm Inner diameter: 0.974mm Deformation results: Units in mm Material Properties 7mm GAP 12mm GAP Carbon Fiber: XN50-A Matrix: RS-3 Honeycomb: KOREX 5/32-2.4

32 David Santoyo sLHC OXFORD 17/06/2010 Next Future… The structure frames are the only element which affects to the dimension for the inner ring diameter. Rings are part of the full structure and if frames could pass through the rings by small openings -> Next idea to develop! …This concept would make possible to reduce rings width allowing bigger clearances to extract petals. Opening for frames Opening for services Service Ring