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MM mechanical prototype

The project at CERN focuses on demonstrating the feasibility of a new mechanical prototype while establishing foundational infrastructure for its construction. Key objectives include gaining hands-on experience with materials, assembly procedures, and precision measures. The work highlights the assembly of a full-wedge small sector quadruplet and the use of various gluing techniques. Collaborative efforts among CERN, Dubna, and Lecce aim to address challenges in panel construction and ensure adherence to precision standards with the goal of producing a functional and measureable prototype.

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MM mechanical prototype

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  1. MM mechanical prototype Work progress at CERN

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

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

  4. CERN mechanical prototype (2) • All panels of equal thickness – 12mm • Frame of standard t=10 mm Al profiles • 0.4 mm plastic mesh • 9.5 mm foam panels • Skins – 0.5 mm FR4 • Glue – Araldite 2011 – Araldite AY 103-1 + HY 991 – Araldite AY 103-1 + HY 951

  5. The table • Size: 4 x 2.5 m • Flatness: ≤ 20 µm • Location: Bld. 153

  6. Stiff-back (1) Using Skin suction Tool Vacuum Clarinet gas Vacuum Vacuum Vacuum Rohacell honeycomb Precision insert Skin (G10) Expansive glue Precision shim

  7. Stiff-back (2) • 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 final system using a perforated honeycomb structure with a perforated lower skin • Work in progress • Small 50 x 50 cm2 prototype ready for the test • Large, full wedge size, if prototype successful 60 mm

  8. Gluing (1) Step 1 – FR4 skins were placed and sucked on the table Step 2 – Plastic mesh was wetted with the glue and placed on the FR4 Step 3 – Frame foam panel were placed on the mesh

  9. Gluing (2) • Second skin was placed and sucked on the table • Glue was distributed on the surface • Plastic mesh was wetted by glue and placed on the skin • Prepared “half panel” picked up with the stiff-back structure and placed on the mesh • Calibrated shims were placed under the stiff-back

  10. First experience (1) • Two full-wedge size drift panels were glued • The planarity of the panels seems good – to be measured on the laser interferometer • Araldite AY103 + HY991 seems the optimal • Some problems with the gluing • Some regions where mesh is not glued to the skin • Use other type of glue? • Change the gluing procedure? • Increase the glue gap?

  11. First experience (2) Inner structure Full panel view Problematic regions

  12. Collaborative effort • CERN, Dubna, Lecce … • Drawings and calculations: Lecce and CERN • Infrastructure and tooling: CERN • Technical work: CERN, Dubna, Lecce+ 3 summer students (2 physicist + 1 engineer)

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