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Outer Barrel Support Conditions for Pixel Detector Integration

This information outlines support conditions, phi positions, and mechanical concepts for the Outer Barrel of a Pixel Detector. It includes support point options and integration schemes for efficient assembly and service routing.

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Outer Barrel Support Conditions for Pixel Detector Integration

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  1. ITk Pixel Outer Barrel:PST Interfaces D. Alvarez Feito1; S. Michal2 1CERN EP-DT; 2Université de Genève CERN, 11th January 2019

  2. Outer Barrel: Support Conditions • OB supported directly by the PST • PST rails for insertion and final supports (not enough space for separate supports and rails) • Current scheme assumes 4 support points • It might be needed to be increased to 8 (in the same phi location)

  3. Outer Barrel: Phi Position of Support Points • Two possibilities for the phi-position of the support points • Option 1: Horizontal line (i.e. 0° and 180°) • Equivalent to final support points of current Pixel Detector • Higher PST deflection • Single design for OBH1 and OBH2 • Simplify integration scheme & tooling (no need to change support conditions after completion of OBH) • Possible interference with cooling pipes from inclined rings

  4. Outer Barrel: Support Conditions • Two possibilities for the phi-position of the support points • Option 2: Bottom part of the (i.e. -45° and -135°) • Equivalent to insertion rails of current Pixel Detector • Lower deflection of PST • Different design for OBH1 and OBH2 • More complex service routing • Change of support conditions for at least OBH2 during integration (more complex tooling) Due to the layout, -45°/-135° cannot be implemented. However, approximately -38/-142° and -52°/-128° could be achieved

  5. Outer Barrel: Support Conditions • Two possibilities for the phi-position of the support points • Option 2: Bottom part of the (i.e. -45° and -135°) • Equivalent to insertion rails of current Pixel Detector • Lower deflection of PST • Different design for OBH1 and OBH2 • More complex service routing • Change of support conditions for at least OBH2 during integration (more complex tooling) Due to the layout, -45°/-135° cannot be implemented. However, approximately -38/-142° and -52°/-128° could be achieved

  6. Outer Barrel: Z Position of Support Points • Position in Z will depend on the service scheme and position of PP0s

  7. Outer Barrel: Other Open Points • Overall concept of support points: Wheels vs Sliders • Implementation of Z-stoppers • Adjustment → Very limited space to implement solution for adjustment after insertion (including load monitoring). Pre-alignment before insertion seems more realistic. • Connection to ECs (for insertion)

  8. Questions?

  9. Additional Material

  10. Outer Barrel: Overall Mechanical Concept Inclined Units (Half Layer Shells + Inclined Half-Rings) Half layers (2 x Inclined Units + Longerons) CFRP Half Layer Shells to support the Inclined Half Rings and route the Type-0/Type-1 services and cooling manifold towards Longerons are directly connected to the Half layer Shells due to the lack space for separate flanges

  11. Outer Barrel: Overall Mechanical Concept Outer Barrel Halves (OBH1&2) (3 x Half Layers + Intermediate Supports + Service Support Shells) CFRP Intermediate supports to connect the three layers together at two locations in Z (produced in several parts to ease the service integration) Service support shells to integrate the Type-1 services and test them in advance D. Grondin N. Emeriaud

  12. Outer Barrel: Layer Integration x 2 (OBH1; OBH2) Rings & Type-0 Services not shown for simplicity!

  13. Outer Barrel: Outer System Integration • The two OB halves (OBH1 & OBH2) are integrated around the ECs + IST as foreseen in the original concept. OBH2 EC1 IST EC2 OBH1

  14. Outer Barrel: Outer System Integration • The two OB halves (OBH1 & OBH2) are integrated around the ECs + IST as foreseen in the original concept. OBH2 EC1 IST EC2 OBH1

  15. Outer Barrel: Outer System Integration • The two OB halves (OBH1 & OBH2) are integrated around the ECs + IST as foreseen in the original concept. OBH2 ECs OBH1

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