diff --git a/compact/vertex_tracker.xml b/compact/vertex_tracker.xml
index 4308420e5d8bfedf556972671ecdf5f3c73ca077..1cfc9065d6aef2aab67a81e3b936b157b39c54b6 100644
--- a/compact/vertex_tracker.xml
+++ b/compact/vertex_tracker.xml
@@ -57,6 +57,15 @@ Simple carbon fiber support shell.
<constant name="VertexEndcapMod1_x1" value="2.0*VertexTrackerEndcapP_rmin*sin(VertexEndcapModOpeningAngle/2.0)"/>
<constant name="VertexEndcapMod1_x2" value="2.0*VertexTrackerEndcapP_rmax*sin(VertexEndcapModOpeningAngle/2.0)"/>
<constant name="VertexEndcapMod1_y" value="VertexTrackerEndcapP_rmax*cos(VertexEndcapModOpeningAngle/2.0) - VertexTrackerEndcapP_rmin"/>
+
+ <comment>
+ Extra parameters to approximate a cylinder as a set of skinny staves
+ due to ACTS limitations.
+ </comment>
+ <constant name="VertexBarrelStave_count" value="128"/>
+ <constant name="VertexBarrelStave1_width" value="2*VertexBarrelMod1_rmin * tan(180*degree/VertexBarrelStave_count)"/>
+ <constant name="VertexBarrelStave2_width" value="2*VertexBarrelMod2_rmin * tan(180*degree/VertexBarrelStave_count)"/>
+ <constant name="VertexBarrelShellStave_width" value="2*VertexBarrelShell_rmin * tan(180*degree/VertexBarrelStave_count)"/>
</define>
<display>
@@ -66,27 +75,55 @@ Simple carbon fiber support shell.
<detector
id="VertexBarrel_ID"
name="VertexBarrel"
- type="athena_CylinderVertexBarrel"
+ type="athena_VertexBarrel"
readout="VertexBarrelHits"
insideTrackingVolume="true">
+ <dimensions
+ rmin="VertexBarrelLayer_rmin1"
+ rmax="VertexBarrelShell_rmax+0.2*cm"
+ length="VertexBarrelLayer_length" />
<comment>Vertex Barrel Modules</comment>
<module name="Module1" vis="VertexLayerVis">
- <module_envelope rmin="VertexBarrelMod1_rmin" length="VertexBarrelMod_length" thickness="VertexBarrelMod_thickness" phi="180*degree" />
- <module_component thickness="VertexBarrelSensor_thickness" material="Silicon" sensitive="true">
- <position x="0" />
- </module_component>
+ <frame material="Air" vis="InvisibleNoDaughters"
+ width="VertexBarrelStave1_width"
+ length="VertexBarrelMod_length"
+ height="1*mm"
+ thickness="0.1*um" />
+ <module_component name="ITS3"
+ material="Silicon"
+ sensitive="true"
+ width="VertexBarrelStave1_width"
+ length="VertexBarrelMod_length"
+ thickness="VertexBarrelSensor_thickness"
+ vis="VertexLayerVis" />
</module>
<module name="Module2" vis="VertexLayerVis">
- <module_envelope rmin="VertexBarrelMod2_rmin" length="VertexBarrelMod_length" thickness="VertexBarrelMod_thickness" phi="180*degree" />
- <module_component thickness="VertexBarrelSensor_thickness" material="Silicon" sensitive="true">
- <position x="0" />
- </module_component>
+ <frame material="Air" vis="InvisibleNoDaughters"
+ width="VertexBarrelStave2_width"
+ length="VertexBarrelMod_length"
+ height="1*mm"
+ thickness="0.1*um" />
+ <module_component name="ITS3"
+ material="Silicon"
+ sensitive="true"
+ width="VertexBarrelStave2_width"
+ length="VertexBarrelMod_length"
+ thickness="VertexBarrelSensor_thickness"
+ vis="VertexLayerVis" />
</module>
<module name="SupportShell" vis="VertexSupportVis">
- <module_envelope rmin="VertexBarrelShell_rmin" length="VertexBarrelShell_length" thickness="VertexBarrelShell_thickness" phi="180*degree" />
- <module_component thickness="VertexBarrelShell_thickness" material="CarbonFiber">
- <position x="0" />
- </module_component>
+ <frame material="Air" vis="InvisibleNoDaughters"
+ width="VertexBarrelShellStave_width"
+ length="VertexBarrelMod_length"
+ height="1*mm"
+ thickness="0.1*um" />
+ <module_component name="CF Shell"
+ material="CarbonFiber"
+ sensitive="true"
+ width="VertexBarrelShellStave_width"
+ length="VertexBarrelMod_length"
+ thickness="VertexBarrelSensor_thickness"
+ vis="VertexLayerVis" />
</module>
<comment> Layers composed of many arrayed modules </comment>
<layer module="Module1" id="1" vis="VertexLayerVis">
@@ -104,7 +141,7 @@ Simple carbon fiber support shell.
nz : Number of modules to place in z.
dr : Radial displacement parameter, of every other module.
</comment>
- <rphi_layout phi_tilt="0.0*degree" nphi="2" phi0="0.0" rc="VertexBarrelMod1_rmin" dr="0.0 * mm"/>
+ <rphi_layout phi_tilt="0.0*degree" nphi="VertexBarrelStave_count" phi0="0.0" rc="VertexBarrelMod1_rmin" dr="0.0 * mm"/>
<z_layout dr="0.0 * mm" z0="0.0 * mm" nz="1"/>
</layer>
<layer module="Module2" id="2" vis="VertexLayerVis">
@@ -112,7 +149,7 @@ Simple carbon fiber support shell.
inner_r="VertexBarrelLayer_rmin2"
outer_r="VertexBarrelLayer_rmax2"
z_length="VertexBarrelLayer_length" />
- <rphi_layout phi_tilt="0.0*degree" nphi="2" phi0="0.0" rc="VertexBarrelMod2_rmin" dr="0.0 * mm"/>
+ <rphi_layout phi_tilt="0.0*degree" nphi="VertexBarrelStave_count" phi0="0.0" rc="VertexBarrelMod2_rmin" dr="0.0 * mm"/>
<z_layout dr="0.0 * mm" z0="0.0 * mm" nz="1"/>
</layer>
<layer module="SupportShell" id="3" vis="VertexSupportVis">
@@ -120,7 +157,7 @@ Simple carbon fiber support shell.
inner_r="VertexBarrelShell_rmin"
outer_r="VertexBarrelShell_rmax"
z_length="VertexBarrelShell_length" />
- <rphi_layout phi_tilt="0.0*degree" nphi="2" phi0="0.0" rc="VertexBarrelShell_rmin" dr="0.0 * mm"/>
+ <rphi_layout phi_tilt="0.0*degree" nphi="VertexBarrelStave_count" phi0="0.0" rc="VertexBarrelShell_rmin" dr="0.0 * mm"/>
<z_layout dr="0.0 * mm" z0="0.0 * mm" nz="1"/>
</layer>
</detector>