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We performed electrostatic calculation with Elmer FEM code to chech the uniformity of the drift field in the field cage and look for potential sparking points.
32 cm long
17cm diameter
14 cm diameter
1.5 cm separation from the gas chamber
3 cm separation between cathote and the chamber
Flexible Kapton field cage with copper electrodes printed on one side
83 equipotential strips (3 mm wide 0.5 mm gap)
Drift field 200 V/cm
Gating grid placed 2 cm above the MICROMEGAS detector