News from the lab Large size Micromegas chambers Saclay, 18-19 April 20131 Givi Sekhniaidze / Joerg Wotschack.

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Presentation transcript:

News from the lab Large size Micromegas chambers Saclay, April Givi Sekhniaidze / Joerg Wotschack

Saclay, April On the 2.8 x 2.8 m² granite table was located thin plastic mesh for pressure distribution Covered with 175 μm thick mylar foil with ø3 mm holes Pump connectors

Saclay, April Gas distribution Mesh frame support frames

Saclay, April 20134

5

6 Cross-bars Long bars Sucking heads

Saclay, April x50 mm cross-bars – 1.2 m 50x80 mm long bars – 2.5 m Glued with Araldite sucking heads per bar

Long bars Metrologic Shims Stiff bars Planarity (in microns) 12 rectified bars with 4 or 5 suction cup

X 12 Vacuum Clarinet gas PCB Using Skin suction Tool Vacuum Expansive glue Vacuum Precise shim Saclay, April Skin

Saclay, April Mesh Cyanoacrylate Araldite 2011 Drift PCB

Saclay, April mm thick Aluminum frame mounted on the panel Mesh stretched and glued on the frame 3 special inserts for drift/read-out panel interconnection

Saclay, April M3 screw O-ring Pillars Insert Mesh

Saclay, April

Saclay, April

Saclay, April mm thick FR4 external skin 10 mm thick Aluminum honeycomb External Aluminum frames

Saclay, April

Saclay, April

Saclay, April Due to the deformation of the stiff-back structure the distance between the PCB and the “half” panel was not correctly defined and problems appeared with the gluing. Along of the external Al frame and in some small areas also in the central parts of the PCB the glue is not attached correctly We found gas leak in the drift panel of L2 chamber. In the new drift panels the gas leak problem has been solved. The drift “old” panel of the L2 chamber will be replaced next week