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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 |
The endcap supports are disks made of two 0.05cm thick Carbon Fiber planes separated by a 0.6275cm thick layer of Rohacell31. The radial span and inner z coordinate are:
Layer | Inner Radius | Outer Radius | Inner |z| |
|---|---|---|---|
1 | 20.5cm | 51.0cm | 84.5cm |
2 | 20.5cm | 76.3cm | 110.3cm |
3 | 20.5 | 101.3 | 136.7 |
4 | 20.5 | 126.3 | 162.6 |
where each layer is composed of double-sided sensor modules to measure coordinates in two views. The forward disk supports are composed of .039cm CarbonFiber, 1.2cm Rohacell31 and 0.039cm of CarbonFiber. The sensor modules mounted outside of the disks are double-sided and have 0.03cm of silicon mounted on either side of CarbonFiber/Rohacell31 frames that clip into PEEK (Polyetheretherketone) mounts. The average thickness of the CarbonFiber, Rohacell31 and PEEK in the modules of each disk double-layer is assumed to be the same as that for the barrel modules. The average thicknesses of the readout material are also assumed to be the same, but are repeated on both sides of the modules for double-sided readout.
The the z-positions and radial extents of the annular support rings that complete the structure of the tracker are:
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