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MM mechanical prototype

MM mechanical prototype. Work progress at CERN. Purpose. Demonstrate feasibility Setup of basic infrastructure Gain experience with construction/assembly ideas/schemes Materials Procedures Precision (panel planarity, parallelism of skins, …) Produce objects that can be measured

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MM mechanical prototype

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  1. MM mechanical prototype Work progress at CERN G. Sekhniaidze/J. Wotschack

  2. Purpose • Demonstrate feasibility • Setup of basic infrastructure • Gain experience with • construction/assembly ideas/schemes • Materials • Procedures • Precision (panel planarity, parallelism of skins, …) • Produce objects that can be measured • Establish an Assembly Manual G. Sekhniaidze/J. Wotschack

  3. CERN mechanical prototype (1) • Full-wedge small sector quadruplet • Eta and stereo doublet • Drift gap spacers: 5 mm • Total thickness: 70–80 mm • Gas distribution • Mesh? G. Sekhniaidze/J. Wotschack

  4. CERN mechanical prototype (2) • All panels of equal thickness: 11-12 mm • Standard Al profiles of t=10 mm as frames with special angular inserts • Skins = 0.5 mm (FR4) • Two possible scenarios: • Al honeycomb of t=10 mm expanding glue PB250/SD5604 glue gaps ≈ few 100 µm • Foam panel of t=10 mm plastic mesh of t=100-200µm glue Araldite 2011 G. Sekhniaidze/J. Wotschack

  5. Gluing test (1) Step 1 – FR4 skins were placed on the table Step 2 – Glue (Araldite 2011) has been applied and distributed on the surface Step 3 – Plastic mesh placed on the surface G. Sekhniaidze/J. Wotschack

  6. Gluing test (2) Step 4 – Al profiles and the foam panel with the glue on them were placed on the mesh Step 5 – FR4 skin has been cut around “half panel” G. Sekhniaidze/J. Wotschack

  7. Gluing test, second skin Step 1 – Araldite AY-103 (more fluid) has been applied to the second skin and “half panel” Step 4 – “half panel” placed on the second skin and mesh G. Sekhniaidze/J. Wotschack

  8. 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

  9. Collaborative effort • CERN, Dubna, Lecce … • Drawings and calculations: Lecce and CERN • Infrastructure and tooling: CERN • Technical work: CERN, Dubna, Lecce • Evaluation: all (two summer students for mechanical) G. Sekhniaidze/J. Wotschack

  10. 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

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

  12. 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

  13. Stiff-back • Simple stiff-back 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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