diff --git a/compact/ce_GEM.xml b/compact/ce_GEM.xml
new file mode 100644
index 0000000000000000000000000000000000000000..6cbc95031a0459cd4c9fa0c2800b9d2972dd882e
--- /dev/null
+++ b/compact/ce_GEM.xml
@@ -0,0 +1,39 @@
+<lccdd>
+
+ <comment> Electron endcap GEM tracking </comment>
+
+ <define>
+ </define>
+
+ <limits>
+ </limits>
+
+ <regions>
+ </regions>
+
+ <display>
+ </display>
+
+ <detectors>
+ <detector id="ce_GEM_ID" name="ce_GEM" type="ce_GEM" readout="ce_GEM_Hits" vis="ce_GEMVis" insideTrackingVloume="true">
+ <dimensions rmin="ce_GEM_rmin" rmax="ce_GEM_rmax" length="ce_GEM_length"/>
+ <position x="ce_GEM_x_pos" y="ce_GEM_y_pos" z="ce_GEM_z_pos"/>
+ <layer repeat="ce_GEM_layer" vis="ce_GEM_layerVis">
+ <slice name="Ar10CO2_slice" material="Ar10CO2" thickness="ce_GEM_layer_thickness" sensitive="true"/>
+ </layer>
+ </detector>
+ </detectors>
+
+ <readouts>
+ <readout name="ce_GEM_Hits">
+ <segmentation type="CartesianGridXY" grid_size_x="1.0*mm" grid_size_y="1.0*mm" />
+ <id>system:8,layer:8,x:32:-16,y:-16</id>
+ </readout>
+ </readouts>
+
+ <plugins>
+ </plugins>
+
+ <fields>
+ </fields>
+</lccdd>
diff --git a/compact/definitions.xml b/compact/definitions.xml
index 1f454dc65c626784ec861a8f1a4054df08c30999..c23b1cc6d5296f3853fb2c6e3af9cbfb3cad75f0 100644
--- a/compact/definitions.xml
+++ b/compact/definitions.xml
@@ -130,7 +130,7 @@
===================
Unused IDs: 75-99
- TBD
+ TBD
</comment>
<comment>
@@ -189,10 +189,12 @@
=====================================
Modular RICH ID: 130
- Unused IDs: 131-139
+ Electron Endcap GEM tracking ID: 131
+ Unused IDs: 132-139
</comment>
<constant name="ce_MRICH_ID" value="130"/>
+ <constant name="ce_GEM_ID" value="131"/>
<comment>
=====================================
@@ -531,8 +533,21 @@
<constant name="ce_MRICHLength" value="15*cm"/>
<constant name="ce_MRICHZMin" value="-EcalEndcap_zmin+10.*cm"/>
-
-
+ <comment>
+ ------------------
+ ce_GEM Parameters
+ ------------------
+ </comment>
+ <constant name="ce_GEM_rmin" value="5.0 * cm"/> <comment> temporary number. Need beampipe radius </comment>
+ <!--<constant name="ce_GEM_rmin" value="0.0 * cm"/>-->
+ <constant name="ce_GEM_rmax" value="HcalEndcapN_rmin + 8.0 * cm"/> <comment> temporary number to avoid overlaps </comment>
+ <!--<constant name="ce_GEM_rmax" value="45.0 * cm + 50.0 * cm"/>-->
+ <constant name="ce_GEM_length" value="30.0 * cm"/>
+ <constant name="ce_GEM_x_pos" value="0.0 * cm"/>
+ <constant name="ce_GEM_y_pos" value="0.0 * cm"/>
+ <constant name="ce_GEM_z_pos" value="-SolenoidLength/2.0 + ce_GEM_length/2.0"/>
+ <constant name="ce_GEM_layer" value="8"/>
+ <constant name="ce_GEM_layer_thickness" value="1.0 * cm"/>
</define>
diff --git a/compact/display.xml b/compact/display.xml
index 81130895a31b7a1ae52aa2daa5af2ce38d196641..5befdb0e535e3d4eefebe823f47aaecc26ebffdf 100644
--- a/compact/display.xml
+++ b/compact/display.xml
@@ -53,6 +53,8 @@
<vis name="ffi_ZDCmoduleVis" alpha="1.0" r= "0.1" g="1.0" b="0.9" showDaughters="true" visible="true"/>
<vis name="cb_CTDVis" alpha="0.1" r= "0.1" g="0.0" b="1.0" showDaughters="true" visible="true"/>
<vis name="cb_CTD_Si_layerVis" alpha="1.0" r= "0.9" g="1.0" b="0.1" showDaughters="true" visible="true"/>
+ <vis name="ce_GEMVis" alpha="0.1" r= "0.1" g="0.0" b="1.0" showDaughters="true" visible="true"/>
+ <vis name="cb_GEM_layerVis" alpha="0.8" r= "0.8" g="0.4" b="0.3" showDaughters="true" visible="true"/>
<comment>
Deprecated colors.
diff --git a/compact/materials.xml b/compact/materials.xml
index f6f705f68423d130c840cd19e0d4eeb10f9bbe9d..837b7f028d3138380804a505b5dbe1ca64ed71ab 100644
--- a/compact/materials.xml
+++ b/compact/materials.xml
@@ -186,4 +186,12 @@
<composite n="4" ref="O"/>
</material>
+ <material name="Ar10CO2">
+ <D type="density" value="1.802" unit="mg / cm3"/>
+ <composite n="0.891" ref="Argon"/>
+ <!--<composite n="0.109" ref="CarbonDioxide"/>-->
+ <composite n="0.036" ref="C"/>
+ <composite n="0.073" ref="O"/>
+ </material>
+
</materials>
diff --git a/reference_detector.xml b/reference_detector.xml
index 5273af7b84b6b03b87e67300717f2e01bb4d90cc..c65d5a7d76568cc682b7c0525fbad6b7df19603d 100644
--- a/reference_detector.xml
+++ b/reference_detector.xml
@@ -122,6 +122,7 @@
<include ref="compact/hcal.xml"/>
<include ref="compact/forward_rich.xml"/>
<include ref="compact/ce_mrich.xml"/>
+ <include ref="compact/ce_GEM.xml"/>
<!--
<include ref="compact/roman_pots.xml"/>
-->
diff --git a/src/ce_GEM.cpp b/src/ce_GEM.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..92315945fb6edfe117b2e846c984a879fa0fbe61
--- /dev/null
+++ b/src/ce_GEM.cpp
@@ -0,0 +1,66 @@
+#include <XML/Helper.h>
+//////////////////////////////////
+// Electron Endcap GEM Tracking
+//////////////////////////////////
+
+using namespace std;
+using namespace dd4hep;
+
+static Ref_t createDetector(Detector& desc, xml_h e, SensitiveDetector sens)
+{
+ xml_det_t x_det = e;
+ string detName = x_det.nameStr();
+ int detID = x_det.id();
+
+ xml_dim_t dim = x_det.dimensions();
+ double RIn = dim.rmin();
+ double ROut = dim.rmax();
+ double SizeZ = dim.length();
+ xml_dim_t pos = x_det.position();
+
+ Material Vacuum = desc.material("Vacuum");
+
+ // Create Global Volume
+ Tube ce_GEM_GVol_Solid(RIn, ROut, SizeZ / 2.0, 0., 360.0 * deg);
+ Volume detVol("ce_GEM_GVol_Logic", ce_GEM_GVol_Solid, Vacuum);
+ detVol.setVisAttributes(desc.visAttributes(x_det.visStr()));
+
+ // Construct Layers
+ xml_comp_t x_layer = x_det.child(_U(layer));
+ const int repeat = x_layer.repeat();
+
+ xml_comp_t x_slice = x_layer.child(_U(slice));
+ Material slice_mat = desc.material(x_slice.materialStr());
+ double layerSizeZ = x_slice.thickness();
+ double layerRIn;
+ double layerROut;
+ double layerPosZ;
+
+ // Loop over layers
+ for(int i = 0; i < repeat; i++) {
+ layerRIn = RIn + 1.0 * cm + ((double)i * 0.5) * cm;
+ layerROut = ROut - 25.0 * cm + ((double)i * 2.0) * cm;
+ layerPosZ = SizeZ / 2.0 - 5.0 * cm - ((double)i * 3.0) * cm;
+ layerSizeZ = 1.0 * cm;
+
+ string logic_layer_name = detName + _toString(i, "_Logic_lay_%d");
+ Volume layerVol(logic_layer_name,Tube(layerRIn, layerROut, layerSizeZ / 2.0, 0.0, 360.0 * deg), slice_mat);
+ layerVol.setVisAttributes(desc,x_layer.visStr());
+ sens.setType("tracker");
+ layerVol.setSensitiveDetector(sens);
+
+ Position layer_pos = Position(0.0, 0.0, layerPosZ);
+ PlacedVolume layerPV = detVol.placeVolume(layerVol, layer_pos);
+ layerPV.addPhysVolID("layer", i+1);
+ }
+
+ DetElement det(detName, detID);
+ Volume motherVol = desc.pickMotherVolume(det);
+ Transform3D tr(RotationZYX(0.0, 0.0, 0.0), Position(pos.x(), pos.y(), pos.z()));
+ PlacedVolume detPV = motherVol.placeVolume(detVol, tr);
+ detPV.addPhysVolID("system", detID);
+ det.setPlacement(detPV);
+ return det;
+}
+
+DECLARE_DETELEMENT(ce_GEM, createDetector)