====== Electrostatic Calculations ======
We performed electrostatic calculation with Elmer FEM code to check the uniformity of the drift field in the field cage and look for potential sparking points.
{{ ::geometry.png?300 |}}
== Dimensions of the chamber ==
  *32 cm long
  *17cm diameter
== Dimensions of the field cage ==
  *14 cm diameter
  *1.5 cm separation from the gas chamber
  *3 cm separation between cathote and the chamber
== Characteristics of the cage ==
  *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
==== Electrostatic Potential and Drift Lines ====
{{ :lines.png?300 | Gating grid off}}
{{ :lines_on.png?300 | Gating grid on}}
==== Electrostatic Field and Drift Lines ====
{{ :e_fielddec2015.png?300 |Electrostatic field magnitude}}
{{ :e_field2_dec.png?300 | Electrostatic field uniformity in X direction }}
==== Gating grid ====
{{gg_wiki_off.png?300 | Bias Off}}
{{gg_wiki_on.png?300 |Bias On}}
  *65 Wires 100 um diameter
  *2mm pitch 
  *placed 1 cm from micromesh
  *-200 V
=== Garfield Simulations ===
Gating grid off\\
{{:gg_garfieldl_unbiased.png?300|}}
{{:gg_garfield_potential_unbiased.png?300|}}

Gating grid on 2mm pitch 20V\\
{{:gg_garfield_potential.png?300|}}
{{:gg_garfield_drift.png?300|}}

Gating grid on 2mm pitch 40V\\
{{:gg_garfield_potential_40.png?300|}}
{{:gg_garfield_drift40.png?300|}}

Gating grid on 1mm pitch 20V\\
{{:gg_garfield_potential_1mm.png?300|}}
{{:gg_garfield_drift_1mm.png?300|}}

Gating Grid Transparency Calculation\\
{{ :gg_transmission.png?300 |}}

==== PCB Electrodes field calculations ====
Calculation of the electrostatic field in the Anode electrodes, with and without an embedded electrode.
{{ :electrodes.png?300 |}}
Results available in {{:electrodes.pdf|}}