diff --git a/ci_HCAL.xml b/ci_HCAL.xml
new file mode 100644
index 0000000000000000000000000000000000000000..37c84dcc8d33746bb21909e9af78c3978f1da179
--- /dev/null
+++ b/ci_HCAL.xml
@@ -0,0 +1,74 @@
+<lccdd xmlns:compact="http://www.lcsim.org/schemas/compact/1.0"
+ xmlns:xs="http://www.w3.org/2001/XMLSchema"
+ xs:noNamespaceSchemaLocation="http://www.lcsim.org/schemas/compact/1.0/compact.xsd">
+
+ <!-- Some information about detector -->
+ <info name="Central Ion HCAL" title="Central Ion HCAL"
+ author="Marshall Scott"
+ url="https://eicweb.phy.anl.gov/EIC/detectors/reference_detector.git"
+ status="development"
+ version="v1 2021-03-31">
+ <comment>Central Ion HCAL</comment>
+ </info>
+
+ <!-- Use DD4hep elements and materials definitions -->
+ <includes>
+ <gdmlFile ref="elements.xml"/>
+ <gdmlFile ref="materials.xml"/>
+ </includes>
+
+ <!-- Define the dimensions of the world volume -->
+ <define>
+ <!-- Temporary, just sdummy place holders at the moment -->
+ <constant name="world_side" value="50*m"/>
+ <constant name="world_x" value="world_side"/>
+ <constant name="world_y" value="world_side"/>
+ <constant name="world_z" value="500.*m"/><!--Taken from DetectorConfig.hh-->
+
+ <constant name="ci_HCAL_id" value="1"/>
+ <constant name="ci_HCAL_rin" value="10 * cm"/>
+ <constant name="ci_HCAL_rout" value="95 * cm"/>
+ <constant name="ci_HCAL_sizez" value="30 * cm"/>
+ <constant name="ci_HCAL_shiftz" value="0 * cm"/>
+ <constant name="ci_HCAL_posz" value="0 * cm"/>
+ <constant name="ci_HCAL_posx" value="0 * cm"/>
+ <constant name="ci_HCAL_nlayers" value="8"/>
+ </define>
+
+ <limits>
+ <comment>Not defined within the ci_HCAL.hh file</comment>
+ </limits>
+
+ <regions>
+ <comment>Not defined within the ci_HCAL.hh file</comment>
+ </regions>
+
+ <!-- Common Generic visualization attributes -->
+ <!-- change this -->
+ <comment>Common Generic visualization attributes</comment>
+ <display>
+ <vis name="ci_HCALVis" r= "0.8" g="0.4" b="0.3" alpha="0.8" showDaughters="true" visible="true"/>
+ </display>
+
+ <!-- Define detector, currentky dummy values -->
+ <detectors>
+ <comment>
+ Central Ion HCAL
+ </comment>
+ <detector id="ci_HCAL_id" name="ci_HCAL" type="ci_HCAL" insideTrackingVolume="false" vis="ci_HCALVis">
+ <material name="Ar10CO2"/>
+ <dimensions rmin="ci_HCAL_rin" rmax="ci_HCAL_rout" sizez="ci_HCAL_sizez" delta="ci_HCAL_shiftz" z="ci_HCAL_posz" x="ci_HCAL_posx" nlayers="ci_HCAL_nlayers"/>
+ <layer id="0" z="-sizez * 0.5 + (5 + 3. * id) * cm" inner_r="rmin + (1. + 0.5 * id) * cm" outer_r="rmax + (-25. + 2. * id) * cm" dz="1 * cm" />
+ <layer id="1" z="-sizez * 0.5 + (5 + 3. * id) * cm" inner_r="rmin + (1. + 0.5 * id) * cm" outer_r="rmax + (-25. + 2. * id) * cm" dz="1 * cm" />
+ <layer id="2" z="-sizez * 0.5 + (5 + 3. * id) * cm" inner_r="rmin + (1. + 0.5 * id) * cm" outer_r="rmax + (-25. + 2. * id) * cm" dz="1 * cm" />
+ <layer id="3" z="-sizez * 0.5 + (5 + 3. * id) * cm" inner_r="rmin + (1. + 0.5 * id) * cm" outer_r="rmax + (-25. + 2. * id) * cm" dz="1 * cm" />
+ <layer id="4" z="-sizez * 0.5 + (5 + 3. * id) * cm" inner_r="rmin + (1. + 0.5 * id) * cm" outer_r="rmax + (-25. + 2. * id) * cm" dz="1 * cm" />
+ <layer id="5" z="-sizez * 0.5 + (5 + 3. * id) * cm" inner_r="rmin + (1. + 0.5 * id) * cm" outer_r="rmax + (-25. + 2. * id) * cm" dz="1 * cm" />
+ <layer id="6" z="-sizez * 0.5 + (5 + 3. * id) * cm" inner_r="rmin + (1. + 0.5 * id) * cm" outer_r="rmax + (-25. + 2. * id) * cm" dz="1 * cm" />
+ <layer id="7" z="-sizez * 0.5 + (5 + 3. * id) * cm" inner_r="rmin + (1. + 0.5 * id) * cm" outer_r="rmax + (-25. + 2. * id) * cm" dz="1 * cm" />
+ </detector>
+ </detectors>
+
+ <plugins>
+ </plugins>
+</lccdd>
\ No newline at end of file
diff --git a/src/ci_HCAL.cpp b/src/ci_HCAL.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..0b0395fe37d56a833a35236286df113766c98dc3
--- /dev/null
+++ b/src/ci_HCAL.cpp
@@ -0,0 +1,68 @@
+#include <XML/Helper.h>
+///////////////////////////
+// Central Ion GEM
+///////////////////////////
+
+using namespace dd4hep;
+
+static Ref_t createDetector(Detector& desc, xml_h handle, SensitiveDetector sens)
+{
+
+ xml::DetElement detElem = handle;
+ std::string detName = "ci_HCAL";
+ int detID = 1;
+
+ //xml::Component dims = detElem.dimensions();
+ //Envelope volume specs
+ double RIn = 0. * dd4hep::cm;
+ double ROut = 300. * dd4hep::cm;
+ double SizeZ = 160. * dd4hep::cm;
+ double ShiftZ = 5. * dd4hep::cm;
+ double PosZ = 0. * dd4hep::cm;
+ double det_RIn = 80. * dd4hep::cm;
+ Material mat_iron = desc.material("Iron");
+ Material mat_air = desc.material("Air");
+ Material mat_vac = desc.material("Vacuum")
+
+
+
+ Tube ci_Hcal_Solid(RIn, ROut, SizeZ / 2., 0., 360 * deg);
+ Volume envelopeVol("ci_Hcal_Logic", ci_Hcal_Solid, mat_vac);//check that this one is iron
+ envelopeVol.setVisAttributes(0.3, 0, 3.0, 0.1);
+
+ //Layer Specs
+ double det_ROut = ROut - 1. * dd4hep::cm;
+ double det_ThicknessZ = 2. * dd4hep::cm;
+ double det_GapZ = 2. * dd4hep::cm;
+ double Nlay = 20;
+
+ Tube ci_Hcal_detSolid(RIn, det_ROut, det_ThicknessZ / 2., 0., 360 * deg);
+ //Volume detVol("ci_Hcal_det_Logic", ci_Hcal_detSolid, mat_iron);//extraneous
+ //detVol.setVisAttributes(0.6, 0, 0.6, 1);
+
+
+
+ //Adding layers to placed detector volume
+ for (int lNum = 0; lNum < Nlay; lNum++){
+ //xml_comp_t x_layer = c;
+ string layer_name = detName + _toString(lNum, "_layer%d");
+ double layer_Posz = -SizeZ / 2. + (lNum + 1) * det_ThicknessZ + (lNum + 1) * 5. * ddphep::cm;
+
+ Volume layer_vol(layer_name, ci_Hcal_detSolid, mat_iron);
+ Position layer_pos(0, 0, layer_Posz);
+ //DetElement layer(envelope_det, layer_name, detID);
+ //layer.setVisAttributes(desc.visAttributes(det.visStr()));
+ //layer.setAttributes(desc, layer_vol, desc.region(), desc.limits(), );//(region, limits, visable).
+ PlacedVolume layer_phv = envelopeVol.placeVolume(layer_vol, layer_pos);
+ layer_phv.addPhysVolID("layer", layerNum);
+ }
+
+ DetElement det(detName, detID);
+ Volume motherVol = desc.pickMotherVolume(det);
+ PlacedVolume detPV = motherVol.placeVolume(envelopeVol, RotationZYX(0,0,0));
+ det.setPlacement(detPV);
+
+ return det;
+}
+// clang-format off
+DECLARE_DETELEMENT(ci_GEM, createDetector)