Differences

This shows you the differences between two versions of the page.

--- electrostatic_calculations [2015/12/02 12:32]
perezlou
+++ electrostatic_calculations [2016/08/30 13:21] (current)
perezlou [PCB Electrodes field calculations]
@@ Line 1: / Line 1: @@
 ====== Electrostatic Calculations ======
-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.
+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?direct&400 |}}
+{{ ::geometry.png?300 |}}
 == Dimensions of the chamber ==
-cm long
+  *32 cm long
-\\ 17cm diameter
+  *17cm diameter
 == Dimensions of the field cage ==
-cm diameter
+  *14 cm diameter
-\\ 1.5 cm separation from the gas chamber
+  *1.5 cm separation from the gas chamber
-\\ 3 cm separation between cathote and the chamber
+  *3 cm separation between cathote and the chamber
 == Characteristics of the cage ==
-Flexible Kapton field cage with copper electrodes printed on one side
+  *Flexible Kapton field cage with copper electrodes printed on one side
-\\ 83 equipotential strips (3 mm wide 0.5 mm gap)
+  * 83 equipotential strips (3 mm wide 0.5 mm gap)
-\\ Drift field 200 V/cm
+  *Drift field 200 V/cm
-\\ Gating grid placed 2 cm above the MICROMEGAS detector
+  *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|}}

Proton Detector

User Tools

Site Tools

Differences

Page Tools