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WBS 6.3.2 Global Mechanics Outer Cylinder

This document provides an overview of the technical challenges and risks associated with the Mechanics Outer Cylinder for the US ATLAS HL-LHC CD-3a Review in July 2019. The Outer Cylinder serves as the main vessel for housing other ITk assemblies, with major interfaces including IWV, Strip Shell Layer-3, and Structural Bulkhead. The document highlights the fabrication risk, material composition, and various functions of the Outer Cylinder including gas seal, faraday cage, and thermal barrier.

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WBS 6.3.2 Global Mechanics Outer Cylinder

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  1. WBS 6.3.2Global Mechanics Outer Cylinder Risk Scrubbing October 17 2019 Dennis Boettcher US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  2. Deliverable Overview The Outer Cylinder is the main vessel that houses other ITk assemblies. The major interfaces to the OC are the IWV, the outer-most Strip Shell Layer-3, and Structural Bulkhead. • The OC is required at CERN relatively early in development to begin integration of other assemblies. • The OC is made from 3 similarly sized cylinders to reduce fabrication risk • The OC is made from CN60 high modulus carbon fiber. • Serves as gas seal and faraday cage • Serves as thermal barrier (heaters) • No active cooling US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  3. Technical Challenges • Cylinder is thin and has tight tolerances • The flanges have complex layups and flatness requirements • The overall assembly is very large US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  4. Risk Overview US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  5. Risk Description: RD2 US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  6. Risk Description: RD3 US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  7. Risk Description: RD4 Should move to PST and append new task ID US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  8. Risk Description: RD5 US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  9. Risk Description: RD7 US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  10. Risk Description: RD8 US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  11. Risk Description: RD9 US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  12. Risk Description: RD10 US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  13. Risk Description: RD11 US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  14. Not in RR US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

  15. Risk Description: ITEM US ATLAS HL-LHC CD-3a Review, July 9-11, 2019

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