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Measurements on L3 chamber (mechanical aspect)

Measurements on L3 chamber (mechanical aspect). Michele Bianco Weekly MicroMegas Meeting 29/10/2013. A dedicate measurement on the L3 Drift and Readout panels have been performed in order to evaluate the deformations produced by the mesh tension and gas flow. Overview.

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Measurements on L3 chamber (mechanical aspect)

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  1. Measurements on L3 chamber (mechanical aspect) Michele Bianco Weekly MicroMegas Meeting 29/10/2013

  2. A dedicate measurement on the L3 Drift and Readout panels have been performed in order to evaluate the deformations produced by the mesh tension and gas flow. Overview

  3. L3 transversal section Mesh frame support Gas distribution Drift Panel (15 mm thick) Drift gap (5 mm thick) R/O Panel (10 mm thick)

  4. Internal spacers Hole in the mesh to accommodate the screw. A Kapton ring has been applied to avoid shortcuts between mesh and resistive strips. Screws which keep the distance fixed, are provided with an o'ring to assure the perfect gas tight.

  5. Test setup Central line Intermediate line L3 chamber Micrometer Aluminium bar Aluminium rails Iron table Interconnecting screws

  6. Expected deformations Al spacers Plastic spacers for screws Mesh tension Mesh tension

  7. Drift panel results

  8. Readout panel results

  9. Conclusions and plans • The Drift and Readout panels are deformed under the effect of the mesh tension. • Without external constraints (interconnecting screws), the deformation varies according the internal gas overpressure. • The panels deformations are reduced applying the interconnecting screws. • The deformations induced by the gas overpressure are extremely reduced while the interconnecting screws are applied. • Measurements on the intermediate line have to be analyzed • Dedicate measurements on the Drift and R/O panel decoupled, have to be performed in order to evaluate the deformations on each single panel.

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