1. ATLAS Pixel Detector Pixel Support Tube and Related November 9, 2001 Pixel Day E. Anderssen, LBNL

2. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Overview Status of Work, technical and other –PST and Supports –Pixel Supports –Service/Beampipe Supports Immediate plans –Prototyping in ‘02 Discrepancies –All along the way…

3. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Chain of Support for PST to Cryostat PIXELSUPPORTTUBE SCT TRT ID Vee Rail ID Flat Rail Side CSide A View from top—all Tube Supports are Horizontal and Co-planar Properties TBD Constraint TBD Support Positions are shown, But constraint conditions are Not indicated here. +Z +X +Y Vertical Agreed Support Positions outside PST PST Support Conditions Under Investigation

4. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Support Conditions of Beampipe Beampipe Cruciform Supports align with Stiffest part of PST—the end flanges All support planes on frame are wires allowing longitudinal (axial) float One Z-Fixture is foreseen to take up ATLAS Access/Opening loads

5. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Pixel Support Tube Mockup Mockup in three pieces to simulate independent parts of tube –Goal is for full length of entire tube to simulate all installation scenarios –Detector rails are removable, should modification be necessary –Intend to run ‘installation tests’ in ‘02

6. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Rail Design in Support Tube Vee and Flat rails were chosen to provide pseudo-kinematic support for the detector during delivery to the support points Rails are used only for delivery, not support mockup

7. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL PST Important Features Bolt flanges Sct mount pads End Plugs (1 mm equiv. carbon sheet) Hoop Hat Stiffeners (section view) 30 45 10 End Support End Supports

8. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Flange Face (machined layup) Flange base (Layup) Stiffeners (layups) Support Flange Bonded Assembly T-nuts (bonded) Old design - now gone for independent thermal barrier

9. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Slider design - materials testing Friction Tester nearing completion –Applies variable pressure –Measures angular acceleration –Slides sample against interchangeable disk of given material M slider to be tested turntable (carbon disk) position is movable along arm M Mass provides normal force Encoder on shaft measures acceleration arm hinge

10. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Gravity Sag Calculations Carbon Glass Whole Tube Sags at ends during operation—it is intended to ‘remove’ this sag when Reattaching supports after installation of Forward ID  Note: Sag is with Package in place—much less without

11. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Reaction Loads On SCT Model Material FX (N) FY (N) FZ (N) MX (Nm) MY (Nm) MZ (Nm) Carbon-1510253-- Glass-53089-- Vertical Bending – Both Ends Both Ends Bent – 1 Z Constraint Model Material FX (N)FY (N)FZ (N)MX (Nm) MY (Nm) MZ (Nm) Carbon146---233- Glass52---83- Both Ends Bent – 2 Z Constraints Model Material FX (N)FY (N)FZ (N)MX (Nm) MY (Nm) MZ (Nm) Carbon297-1870-536- Glass108-468-110- One End Bent – 1 Z Constraint Model Material FX (N)FY (N)FZ (N)MX (Nm) MY (Nm) MZ (Nm) Carbon 390 --- 623 - Glass 137 --- 218 - Horizontal Bending

12. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Flexure Block interface to SCT Penetration FxFx FzFz FyFy MyMy MzMz MxMx This interface must take same loads as applied to Flexure—Will know them well after Joint Model is run  Will look at simple feasibility with current (infinite stiffness) loads  Will iterate size if indicated by ROM calculation SCT Thermal Barrier Penetration

13. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Flange Envelope Pixel Support Tube (Barrel Region)Pixel Support Tube (forward) 240 261 242 260 Dimensions from 1:1 ID Layout May ‘01 775  780 765 785  792 796  800 795  799 245  246 257  259.5 248 811 251 May change By ~5mm to 806  new structure added 700 SCT BARREL 3 Barrel Mount Flange Interlink SCT Forward Envelope 806 requested Changes 244

14. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Flange Envelope Pixel Support Tube (Barrel Region)Pixel Support Tube (forward) 240 261 242 260 New Proposed Envelopes—not yet agreed 780 765 792 800 799 252 811 251 700 SCT BARREL 3 Barrel Mount Flange Interlink SCT Forward Envelope 806 244 shim 255 254 246

15. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Z-Flexure (Side A) Support Tube Mount Pad M55J View Direction Cut Plane Insulator (G10) or Al 2 0 3 Access hole Thru Service Rail Gap filled After picture Dowel pins have line fit Metal Insert Bonded in Thermal Barrier squeezed in here

16. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Pixel Supports

17. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Pixel Package Assembly Service and Beampipe Support Mockup Pixel Frame shown

18. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Tension/Compression Transmission through structures not services Clips register to Buttons on Frame and Service/Beampipe support structure Gaps allow ‘Phi’ offsets of up to +/- 1mm while only 0.25mm longitudinally

19. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Wire Planes supported by Pulleys Wires not modeled, beampipe not shown

20. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Tubes route cables to Barrel Separate blocks at Forward end

21. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Services Supported By Framework

22. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Service quarter panels supported by framework

23. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Need to adjust length of Tube or Support Plane location of VI

24. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Outside view of patch Panel

25. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Section View of patch Panel

26. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Barrel End of Support Structure

27. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL PST Prototyping Plans Short Mandrel –1 foot long - 1 for glass, 1 for carbon – aluminum or steel –“Dry-run” in autoclave to determine thermal response –Determine final diameters from test layups Full Size Mandrel (forward length) –Quotes already received Approximately 14,000 to 20,000 USD 8 Weeks delivery –Plans to Fabricate forward prototype in glass All flanges and rail features Use for production forwards if diameters are correct Implications of Glass Forwards/Carbon Barrel on prototyping plans must be more fully assessed Insertion Testing

28. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL PST Prototypes in ETC ‘02 Includes –Friction Testing –Material Test Panels –“Foot Long” prototypes –End-Plug Prototype estimated as ½ production total Gray area –Calling first Forward Tube a prototype—Production monies all in FY’03, but need to order tooling and start fab in ’02 –Missing prototype flexure mounts (as noted in 1.1.1.1.3.5) –Prototype ‘End Plate’ buried in Frame estimate, but included Pixel mounts (~$5k ’01, $10k ’02) –Monies for assembly testing of Insertion mockup spread over a few efforts and called ‘testing’ hard to track if appropriate levels have been assigned

29. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Service Support Prototypes ‘02 Now includes Beam Vacuum Support Structure Prototype in ’02 already includes bond fixture—need to increase cost some to account for additional scope of VI support, but this saves overall by not having entire extra fixture for VI support Intention for ’02 to build 1 quarter panel support and 2 service panels—still valid Need to build Full VI support for both installation testing and to support services –Needs to be ‘real’ for use in case pixels are late –Needs to have ‘real’ rail interface (unless replaceable interface) Need to add cost to this section of WBS, or make new WBS for Beam pipe support

30. ATLAS Pixel Detector Nov 2001 Pixel Day E. Anderssen LBNL Recent Changes and Estimate of Impact Change of Forwards to Quartz fiber— +$30k –Additional Shell tool $14-20k –Additional Hat stiffeners ~120-160 Man hours M-tech Introduction of Independent SCT Thermal Barrier +$35k –Throw away ~3-4 man months LBL/Junior Eng Design time –Accrue additional 2-3 man months re-design of Flange/Flexures Increase in scope to include Beam Vacuum Supports +$110k –Design time not assessed –Attempt to use/re-use as much fixture costs as possible –Estimate ~$25k Material/200hr Shop/300hr M-tech (REAL) ‘03 –Estimate ~$10k Material/200hr Shop/300hr M-tech (prototype) ’02 –(Est. based on cost of End Plug and fixturing, using same tool as service panel support structure PST End Support (former Beam Vacuum Support) not included in cost estimates yet. PPI/Endplug Thermal barrier increase in Complexity –Current Estimate based on segmented flat panel. Cost will increase if tool is needed to make other than a flat shape.