L3 chamberarrived in bd 154

Michele Bianco, Maria Hoffmann, Givi Sekhniaidze, Joerg Wotshack

Weekly MicroMegas Meeting 28/05/2013

2

• Mechanical differences with L2

• First HV test

28/05/2013

3

Mechanical differences with L2 (Gas distribution)

L2 Drift panel

skinframes

honeycomb

Gas distribution

skinhoneycomb

frames

Gas distribution

28/05/2013

4

Gas distribution

Mesh frame support

L3 transversal section

Mechanical differences with L2 (Gas distribution)

28/05/2013

5

New internal spacers

28/05/2013

Hole in the mesh to accommodate the screw.

A Kapton ring has been applied to avoid shortcuts between mesh and resistive strips.

Screws which will keep the distance fixed, are not yet applied.For this reason the gas in not perfect gas tight.

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First HV test

28/05/2013

AR

AL

BR

BLSide A Side B

LEFT Side

RIGHT Side

Impedance test during the assembling phase.

Adopted the same naming schema used for L2 chamber

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First HV test

28/05/2013

The L3 chamber has been positioned above to the L2, and connected to the gas line from the L2 output.

The HV channel used for the L2, have been used to test L3

Current absorption (readout panel) , few nA up to 580 Volts.

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Summary• Second 2,2 x 1 m2 Micromegas chamber has been build,

it is almost complete and under test in our lab.• No particular problem arise from the preliminary HV tests.• Dedicate tests, to verify the new layout, have to be

performed, in particular for the new internal spacer.• Possible conflict with the use of APV, now used for

Tmm/T chambers test, next week will be shipped to DESY for the testbeam, than only 10 APV card will be available in the lab, not enough to test half chamber in one shot.

28/05/2013