MM mechanical prototype

Work progress at CERN

MMM CERN, 24/06/2013 G. Sekhniaidze/J. Wotschack 1

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

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

All panels of equal thickness: 11-12 mmStandard Al profiles of t=10 mm as frames with special angular insertsSkins = 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

CERN mechanical prototype (2)

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

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”

Gluing test, second skinStep 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

Dimensions

10+ 10+ 10+10+ 10+

5 5 5 5

MM multiplet stack(10+: 11 or 12 mm)

70 – 80 mm

Space for electronics(50 mm in phi)

Dead area: 50 mmSpace for electronics: 50 mm

Electronics boards

Eta strips

Stereo strips

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)

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 ???

The table

Size: 4 x 2.5 m Flatness: ≤ 20 µm Location: B16 Available: Wednesday

VacuumClarinet gas

Skin (G10) Precision insertRohacell honeycomb

Vacuum

Using Skin suction Tool

Vacuum

Expansive glue

Vacuum

Precised shim

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

MM mechanical prototype

Documents

Transcript of MM mechanical prototype

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