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MM mechanical prototypes

This project aims to demonstrate the feasibility of a full-wedge mechanical prototype at CERN, focusing on basic infrastructure setup and gaining practical experience in construction and assembly techniques. Key features include utilizing materials like aluminum profiles and honeycomb structures with specific thicknesses, ensuring precision and establishing an assembly manual. Collaborative efforts involve teams from CERN, Lecce, and Saclay, with space allocated for electronics and simplified cooling systems. The prototype's assembly scheme leverages advanced techniques, including vacuum tools and gas channels for performance testing.

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MM mechanical prototypes

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  1. MM mechanical prototypes Full wedge option At CERN G. Sekhniaidze/J. Wotschack

  2. Purpose • Demonstrate feasibility • Setup of basic infrastructure • Gain experience with • construction/assembly ideas/schemes • Materials • Procedures • Precision (for me not the main objective) • Produce objects that can be measured • Establish an Assembly Manual G. Sekhniaidze/J. Wotschack

  3. CERN mechanical prototype • Full-wedge small sector quadruplet • Eta and stereo doublet • All panels of equal thickness: 11-12 mm • Standard Al profiles of t=10 mm as frames • Al honeycomb of t=10 mm • Skins = 0.5 mm (FR4) • Glue gaps ≈ few 100 µm • Drift gap spacers: 5 mm • Total thickness: 75–80 mm G. Sekhniaidze/J. Wotschack

  4. Dimensions 70 – 80 mm Dead area: 50 mm Space for electronics: 50 mm 10+ 10+ 10+ 10+ 10+ Eta strips 20 mm Stereo strips Electronics boards 5 5 5 5 Space for electronics (50 mm in phi) MM multiplet stack (10+: 11 or 12 mm) G. Sekhniaidze/J. Wotschack

  5. Collaborative effort • CERN, Lecce, Saclay, … more collaborators are welcome • Drawings and calculations: Lecce and CERN • Infrastructure and tooling: CERN, Saclay • Technical work: CERN, Lecce, Saclay • Evaluation: all (two summer students for mechanical) G. Sekhniaidze/J. Wotschack

  6. What could/should be included • Realistic materials and glues • Realistic thickness and segmentation of PCBs • Space for on-chamber electronics boards • Simplified cooling and cabling channels • We foresee to insert heating wires into the cooling channels to simulate electronics/cooling • Gas channels and seals (to allow for gas pressure tests) • Mesh frame (but not necessarily the mesh) • T-sensors (a few) to allow for test measurements • Other ??? G. Sekhniaidze/J. Wotschack

  7. The table • Size: 4 x 2.5 m • Flatness: ≤ 20 µm • Location: B16 • Available: mid May G. Sekhniaidze/J. Wotschack

  8. Assembly scheme G. Sekhniaidze/J. Wotschack

  9. Using Skin suction Tool Vacuum Clarinet gas X 5 Vacuum Vacuum Vacuum Rohacell honeycomb Precision insert Skin (G10) Expansive glue Precised shim G. Sekhniaidze/J. Wotschack

  10. Stiffback • Simple stiffback structure with suction heads (following small test structure) used for 2 x 1 m2 prototype • CERN-DT group is working on a more final system using a perforated honeycomb structure with a perforated lower skin • Work in progress • Small 50 x 50 cm2 system under construction • Large system if prototype successful 60 mm G. Sekhniaidze/J. Wotschack

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