diff --git a/compact/B0_tracker.xml b/compact/B0_tracker.xml
new file mode 100644
index 0000000000000000000000000000000000000000..165e3ebd8fa7e2730c92788a16906e3b875e4da5
--- /dev/null
+++ b/compact/B0_tracker.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<lccdd>
+ <define>
+ <comment>
+ ---------------------------------
+ Far Forward B0 Tracker Parameters
+ ---------------------------------
+ </comment>
+ <constant name="B0Tracker_zpos" value="B0PF_CenterPosition + B0PF_Length/2.0 + 20.0*cm"/>
+ </define>
+
+ <detectors>
+ <detector
+ id="B0Tracker_ID"
+ name="B0Tracker"
+ readout="B0TrackerHits"
+ type="ref_RectangularTracker"
+ insideTrackingVolume="true"
+ reflect="false"
+ vis="Argonne_Red">
+ <position x="0" y="0" z="B0Tracker_zpos"/>
+ <layer id="1"
+ vis="Argonne_Blue"
+ x="20.0*cm"
+ y="10.0*cm" >
+ <slice material="Air" thickness="1.0*cm" vis="Argonne_Blue" sensitive="true" />
+ <slice material="Air" thickness="1.0*cm" vis="Argonne_Blue" sensitive="true" />
+ <slice material="Air" thickness="1.0*cm" vis="Argonne_Blue" sensitive="true" />
+ <slice material="Air" thickness="1.0*cm" vis="Argonne_Blue" sensitive="true" />
+ </layer>
+ </detector>
+ </detectors>
+
+ <readouts>
+ <readout name="B0TrackerHits">
+ <segmentation type="CartesianGridXY" grid_size_x="1.0*mm" grid_size_y="1.0*mm" />
+ <id>system:8,barrel:3,layer:4,slice:4,x:32:-16,y:-16</id>
+ </readout>
+ </readouts>
+
+</lccdd>
diff --git a/compact/definitions.xml b/compact/definitions.xml
index 542083ea1a4492d62981fbbe0aa24bd3a4a7c3f1..1ffe34fedb6b71ebc4a17177a1075ef390ab95c5 100644
--- a/compact/definitions.xml
+++ b/compact/definitions.xml
@@ -235,11 +235,13 @@
(150-169) Far Forward Detectors
=====================================
- Forward Roman Pot ID: 150
- Zero Degree Cal. ID: 160
+ Forward Roman Pot ID: 150
+ Forward B0 Tracker ID: 151
+ Zero Degree Cal. ID: 160
</comment>
<constant name="ForwardRomanPot_ID" value="150"/>
+ <constant name="B0Tracker_ID" value="151"/>
<constant name="ffi_ZDC_ID" value="160"/>
<comment>
diff --git a/reference_detector.xml b/reference_detector.xml
index a1493dc1c6c2351f59fa27fa1cd7683c262c55eb..1ff50a25ca15ee15c961c9953250ccaa2c7711aa 100644
--- a/reference_detector.xml
+++ b/reference_detector.xml
@@ -124,6 +124,7 @@
<include ref="compact/ci_GEM.xml"/>
<include ref="compact/hcal.xml"/>
<include ref="compact/forward_trd.xml"/>
+ <include ref="compact/B0_tracker.xml"/>
<!--
<include ref="compact/ci_HCAL.xml"/>
<include ref="compact/forward_rich.xml"/>
diff --git a/src/ref_RectangularTracker_geo.cpp b/src/ref_RectangularTracker_geo.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..1b8ae7436203c77c221a2ff8d44600109a890084
--- /dev/null
+++ b/src/ref_RectangularTracker_geo.cpp
@@ -0,0 +1,88 @@
+//==========================================================================
+// AIDA Detector description implementation
+//--------------------------------------------------------------------------
+// Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+// All rights reserved.
+//
+// For the licensing terms see $DD4hepINSTALL/LICENSE.
+// For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+//
+// Author : M.Frank
+// Modified : W.Armstrong
+//
+//==========================================================================
+//
+// Specialized generic detector constructor
+//
+//==========================================================================
+#include "DD4hep/DetFactoryHelper.h"
+
+using namespace std;
+using namespace dd4hep;
+using namespace dd4hep::detail;
+
+static Ref_t create_detector(Detector& description, xml_h e, SensitiveDetector sens) {
+ xml_det_t x_det = e;
+ Material air = description.air();
+ string det_name = x_det.nameStr();
+ bool reflect = x_det.reflect();
+ DetElement sdet(det_name,x_det.id());
+ Assembly assembly(det_name);
+ PlacedVolume pv;
+ int l_num = 0;
+ xml::Component pos = x_det.position();
+
+ for(xml_coll_t i(x_det,_U(layer)); i; ++i, ++l_num) {
+ xml_comp_t x_layer = i;
+ string l_nam = det_name + _toString(l_num, "_layer%d");
+ double x_lay = x_layer.x();
+ double y_lay = x_layer.y();
+ double z = 0;
+ double zmin = 0;
+ double layerWidth = 0.;
+ int s_num = 0;
+ for(xml_coll_t j(x_layer,_U(slice)); j; ++j) {
+ double thickness = xml_comp_t(j).thickness();
+ layerWidth += thickness;
+ }
+ Box l_box(x_lay/2.0, y_lay/2.0, layerWidth/2.0 );
+ Volume l_vol(l_nam, l_box, air);
+ l_vol.setVisAttributes(description, x_layer.visStr());
+ for (xml_coll_t j(x_layer, _U(slice)); j; ++j, ++s_num) {
+ xml_comp_t x_slice = j;
+ double thick = x_slice.thickness();
+ Material mat = description.material(x_slice.materialStr());
+ string s_nam = l_nam + _toString(s_num, "_slice%d");
+ Volume s_vol(s_nam, Box(x_lay/2.0, y_lay/2.0, thick/2.0), mat);
+ if (x_slice.isSensitive()) {
+ sens.setType("tracker");
+ s_vol.setSensitiveDetector(sens);
+ }
+ s_vol.setAttributes(description, x_slice.regionStr(), x_slice.limitsStr(), x_slice.visStr());
+ pv = l_vol.placeVolume(s_vol, Position(0, 0, z - zmin - layerWidth / 2 + thick / 2));
+ pv.addPhysVolID("slice", s_num);
+ }
+
+ DetElement layer(sdet,l_nam+"_pos",l_num);
+ pv = assembly.placeVolume(l_vol,Position(0,0,zmin+layerWidth/2.));
+ pv.addPhysVolID("layer",l_num);
+ pv.addPhysVolID("barrel",1);
+ layer.setPlacement(pv);
+ if ( reflect ) {
+ pv = assembly.placeVolume(l_vol,Transform3D(RotationY(M_PI),Position(0,0,-zmin-layerWidth/2)));
+ pv.addPhysVolID("layer",l_num);
+ pv.addPhysVolID("barrel",2);
+ DetElement layerR = layer.clone(l_nam+"_neg");
+ sdet.add(layerR.setPlacement(pv));
+ }
+ }
+ if ( x_det.hasAttr(_U(combineHits)) ) {
+ sdet.setCombineHits(x_det.attr<bool>(_U(combineHits)),sens);
+ }
+ pv = description.pickMotherVolume(sdet).placeVolume(assembly,Position(pos.x(),pos.y(),pos.z()));
+ pv.addPhysVolID("system", x_det.id()); // Set the subdetector system ID.
+ sdet.setPlacement(pv);
+ return sdet;
+}
+
+DECLARE_DETELEMENT(ref_RectangularTracker,create_detector)