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The barrels are all 12.5cm long and are composed of .0113cm Silicon, of which the outer .002 002cm is sensitive.
The inner radii of the layers are:
1.461cm46cm, 2.261cm26cm, 3.541cm54cm, 4.801cm80cm, and 6.041cm.04cm
The barrels are supported by 25.5cm long cylinders made of 0.0065cm thick carbon fiber (25% coverage of 0.26mm thick CF).
There are four forward disks on either end, composed of a total of .022cm 0113cm of silicon, of which the inner .002 002cm 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 vertex detector is surrounded by a foam cryostatCables and services are in 3 parts.
The inner cables are 0.012cm thick and run conically from an inner radius of 1.32cm at |z|=6.9cm to 1.455cm at |z|=10.0cm.
Service material of thickness 0.3cm runs conically from an inner radius of 1.455cm at |z|=10cm to 1.542cm at |z|=12cm.
The outer cables are parallel to the conical beam pipe and flare from a thickness of 0.010cm at an inner radius of 1.542cm at |z|=12cm to a thickness of 0.004cm at |z|=167.9cm.
The barrel support is a cylinder 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.
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The VXD utility mixture of cooling channels, cables and fibers etc. 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 +/- 24.0cmentire vertex detector is enclosed within a 200cm long double walled carbon fiber support cylinder.
The support cylinder walls have inner radii of 16.954cm and 18.434cm and are 0.0427cm thick.
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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