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The tracking region is defined to be a cylinder with radius 125.5cm and z extent +/- 167.9cm.
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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.
The central tube has an inner radius of 1.2cm and a z extent of +/- 6.251cm and is made of .040cm thick Beryllium.
The conical sections are 1mm thick Beryllium and flare from 1.2cm inner radius at 6.25cm to 6.97cm at the edge of the tracking region.
The beam pipe has a titanium inner liner .0025cm thick for the central barrel section and 0.0075cm thick for the 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.
The inner radii of the layers are:
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:
z | inner radius |
|---|---|
7.6cm | 1.6cm |
9.5cm | 1.6cm |
12.5cm | 2.0cm |
18.0cm | 2.0cm |
The barrel vertex detector is supported by a Beryllium cage and the whole
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vertex detector is surrounded by a foam cryostat.
The barrel support is a cylinder
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of 0.1cm Beryllium with inner radius 7.0cm and z extent +/- 6.5cm. The barrel support endplate composed 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
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supports 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.
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is 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 of 1.5cm PolystyreneFoam with inner radius 11.2cm and z extent +/- 24.0cm.
The endplate cryostats are disks of 3.0cm PolystyreneFoam with inner radius 2.3cm, outer radius 11.2cm and inner z of 21.0cm.
The cryostat coatings and Faraday cage are represented by 0.02cm Aluminum placed at the inner surfaces of the cryostat.
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This section is still being updated to reflect changes in the tracker descriptions. 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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Calorimeters:
Electromagnetic Calorimeter:
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