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This section is still being updated to reflect changes in the tracker descriptions. Beampipe:The beampipe is composed of three sections: a cylindrical central tube and forward and backward conical sections. Vertex Detector:The vertex detector is composed of a central barrel system with five layers and forward systems composed of four disks. The barrels are all 12.5cm long and are composed of .01cm Silicon, of which the outer .002 is sensitive. 1.4, 2.5, 3.6, 4.8, 6.0 There are four forward disks on either end, composed of a total of .022cm of silicon, of which the inner .002 is sensitive. All of the disks extend to a maximum radius of 7.5cm. The z positions and inner radii for the four disks are:
The barrel vertex detector is supported by a Beryllium cage and the whole vretex detector is surrounded by a foam cryostat. The barrel support is a cylinder 0f 0.1cm Beryllium with inner radius 7.0cm and z extent +/- 6.5cm. The barrel support endplate of a mixture of ladder blocks, annuli, plate and cable/fiber is represented by 0.58cm thick G10, with inner radius 1.5cm, outer radius 7.3cm and inner z of 6.5cm. The mechanical support for the endcap disks are modelled as a pair of Beryllium rings behind each disk at the inner and outer rims, with a thickness of 0.1cm and radial span of 0.7cm each. The VXD utility mixture of cooling channels, cables and fibers etc. are represented by a layer of 0.99cm thick G10 around the conical section of the beampipe at each end. The barrel cryostat is a cylinder 0f of 1.5cm PolystyreneFoam with inner radius 11.2cm and z extent +/- 24.0cm. Tracker:The tracker is composed of five barrels with five endplates. The z extent of the barrels increases with radius. Barrels:For the barrels, the support tubes are composed of .025cm CarbonFiber, 1.3cm of Rohacell31 and 0.25cm CarbonFiber.
Endcap:The forward disk supports are composed of .039cm CarbonFiber, 2.5cm Rohacell31 and 0.039cm of CarbonFiber.
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