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The entire vertex detector is enclosed within a 200cm long double walled carbon fiber support tube.
The support tube walls have inner radii of 16.954cm and 18.434cm and are 0.0427cm thick.
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 four 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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The barrel support cylinders are composed of .025cm 05cm CarbonFiber, 0.8cm 8075cm of Rohacell31 and 0.025cm 05cm CarbonFiber. The inner radii and |z| extent are given by:
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Each A plane has the following material thicknesses of material:
Material | Layer 1 | Layer 2 | Layer 3 | Layer 4 |
|---|---|---|---|---|
Silicon (active) | 0.03cm | 0.03cm | 0.03cm | 0.03cm |
Silicon (dead) | 0.00048cm | 0.00048cm | 0.00048cm | 0.00048cm |
Kapton | 0.0051cm | 0.0064cm | 0.0078cm | 0.0091cm |
Copper | 0.00052cm | 0.00065cm | 0.00079cm | 0.00093cm |
PEEK | 0.02cm | 0.02cm | 0.02cm | 0.02cm |
Rohacell31 | 0.14cm | 0.14cm | 0.14cm | 0.14cm |
Epoxy | 0.0175cm | 0.0175cm | 0.0175cm | 0.0175cm |
Carbon Fiber | 0.016cm | 0.016cm | 0.016cm | 0.016cm |
Each B plane has the following material thicknesses of material:
Material | Layer 1 | Layer 2 | Layer 3 | Layer 4 |
|---|---|---|---|---|
Silicon (active) | 0.03cm | 0.03cm | 0.03cm | 0.03cm |
Silicon (dead) | 0.00048cm | 0.00048cm | 0.00048cm | 0.00048cm |
Kapton | 0.0051cm | 0.0064cm | 0.0078cm | 0.0091cm |
Copper | 0.00052cm | 0.00065cm | 0.00079cm | 0.00093cm |
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Layer | Inner Radius | Outer Radius | Inner |z| |
|---|---|---|---|
1 | 20.5cm | 51.0cm | 84.5cm |
2 | 20.5cm | 76.3cm | 110.3cm |
3 | 20.5 5cm | 101.3 3cm | 136.7 7cm |
4 | 20.5 5cm | 126.3 3cm | 162.6 |
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6cm |
Forward Disks
There are also three forward disks composed of double-sided sensor modules to measure coordinates in two views. The table below shows the radial extant of the disks and the inner |z| position for the "A" and "B" sensor planes.
Layer | Inner Radius | Outer Radius | |z| for A Plane | |z| for B Plane |
|---|---|---|---|---|
1 | 2.78cm | 16.67cm | 20.65 | 20.85cm |
2 | 7.51cm | 16.67cm | 54.1cm | 54.3cm |
3 | 11.65cm | 16.67cm | 83.2cm | 83.4cm |
Each A Plane has the following material thicknesses:
Material | Layer 1 | Layer 2 | Layer 3 |
|---|---|---|---|
Silicon (active) | 0.03cm | 0.03cm | 0.03cm |
Silicon (dead) | 0.00048cm | 0.00048cm | 0.00048cm |
Kapton | 0.0038cm | 0.0038cm | 0.0038cm |
Copper | 0.00038cm | 0.00038cm | 0.00038cm |
PEEK | 0.02cm | 0.02cm | 0.02cm |
Rohacell31 | 0.14cm | 0.14cm | 0.14cm |
Epoxy | 0.0175cm | 0.0175cm | 0.0175cm |
Carbon Fiber | 0.016cm | 0.016cm | 0.016cm |
Each B Plane has the following material thicknesses:
Material | Layer 1 | Layer 2 | Layer 3 |
|---|---|---|---|
Silicon (active) | 0.03cm | 0.03cm | 0.03cm |
Silicon (dead) | 0.00048cm | 0.00048cm | 0.00048cm |
Kapton | 0.0038cm | 0.0038cm | 0.0038cm |
Copper | 0.00038cm | 0.00038cm | 0.00038cm |
The forward disk supports are disks made of two 0.05cm thick Carbon Fiber planes separated by a 0.35cm thick layer of Rohacell31. The radial span and inner z coordinate are:
Layer | Inner Radius | Outer Radius | Inner |z| |
|---|---|---|---|
1 | 2.68cm | 16.87cm | 21.18cm |
2 | 7.41cm | 16.87cm | 54.37cm |
3 | 11.55cm | 16.87cm | 83.48cm |
The the z-positions and radial extents of the annular support rings that complete the structure of the tracker are:
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