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The tracker is composed of five cylindrical barrels with five 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 radii and z extent of the barrel silicon are:
layer | z | inner radius |
|---|---|---|
1 | 26 55.7 8 | 20 21.0 8 |
2 | 60 82.8 5 | 45 46.6 8 |
3 | 94 108.8 3 | 71.1 8 |
4 | 128 134.9 7 | 96.7 8 |
5 | 163 160.0 6 | 122 121.3 8 |
The estimated material thickness for modules, silicon, readout, and cables are averaged over the barrel and are given by:
Material | L1 | L2 | L3 | L4 | L5 |
|---|---|---|---|---|---|
PEEK | 0.02cm | 0.02cm | 0.02cm | 0.02cm | 0.02cm |
Rohacell31 | 0.14cm | 0.14cm | 0.14cm | 0.14cm | 0.14cm |
Epoxy | 0.0175cm | 0.0175cm | 0.0175cm | 0.0175cm | 0.0175cm |
Carbon Fiber | 0.016cm | 0.016cm | 0.016cm | 0.016cm | 0.016cm |
Silicon (active) | 0.03cm | 0.03cm | 0.03cm | 0.03cm | 0.03cm |
Silicon (dead) | 0.00048cm | 0.00048cm | 0.00048cm | 0.00048cm | 0.00048cm |
Kapton | 0.0038cm | 0.0051cm | 0.0064cm | 0.0078cm | 0.0091cm |
Copper | 0.00038cm | 0.00052cm | 0.00065cm | 0.00079cm | 0.00093cm |
The barrel support cylinders are composed of For the barrels, the support tubes are composed of .025cm CarbonFiber, 0.8cm of Rohacell31 and 0.25cm 025cm CarbonFiber. The inner radii and |z| extent are given by:
The sensor modules for the barrel are single-sided and have 0.03cm of silicon mounted on CarbonFiber/Rohacell31 frames that clip into PEEK (Polyetheretherketone) mounts. The average thickness of the CarbonFiber, Rohacell31 and PEEK in the modules of each barrel layer are 0.016cm, 0.14cm and 0.02cm repectively. The average thicknesses of the readout materials are 0.00048cm of Silicon, 0.0064cm of Kapton and 0.00065cm of Copper, however, the thickness of the cable material varies by layer.
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