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1.46cm, 2.26cm, 3.54cm, 4.80cm, and 6.04cm
The barrels are supported by 25Sensors are mounted on 13.5cm long support cylinders made of 0.0065cm thick carbon fiber (25% coverage of 0.26mm 026cm thick CF). The cylinders attach to 0.0065cm thick carbon fiber bulkheads that span 1.45cm<r<6.04cm located at |z|=6.75 cm. The vertex detector supports are 0.0427cm thick carbon fiber cylinders that span 1.45cm<r<16.953cm located at |z|=6.78cm.
Readout electronics and the radial cabling are modeled as disks at the ends of the sensors. At the ends of each sensor layer are G10 rings with a radial thickness of 0.2cm and a thickness in z of 0.498cm. The rings have an inner |z| position of 6.25cm and the inner radii are the same as the sensors.
There are four forward disks on either end, composed of a total of .0113cm of silicon, of which the inner .002cm is sensitive. All of the disks extend to a maximum radius of 7.5cm. The innner |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 forward disks are supported by 0.0065cm thick carbon fiber (25% coverage of 0.026cm thick CF) that are located 0.02cm behind the inner face of the disks and extend from the inner disk radius to an outer radius of 16.953cm.
Cables 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.
The mechanical 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. is represented by a layer of 0.99cm thick G10 around the conical section of the beampipe at each end.
The entire vertex detector is enclosed within a 200cm long double walled carbon fiber support cylindertube.
The support cylinder support tube 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 The ends of the support tube double-walled disks of 0.0427cm thick carbon fiber disks that span 5.5cm<r<16.953cm and are located at |z|=97.5cm and |z|=99.74cm.
Tracker:
The tracker is composed of five cylindrical barrels with five disk-shaped endplanes. The z extent of the barrels increases with radius and the endplane for each extends beyond its cylinder in radius to provide overlap. The sensitive medium is silicon, assembled into carbon-fiber/Rohacell/PEEK modules and read out via a bump-bonded chip and Kapton/Copper cables. These modules are supported by carbon-fiber/Rohacell/carbon-fiber barrels or disks. Each barrel cylinder is supported from the next barrel out by an annular carbon fiber-ring. Outside each of these support rings in z, G10/Copper printed circuit boards are mounted for power and readout distribution to all silicon modules in a layer.
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